Email: [email protected]
Phone: +91 93135 43530
Address: 133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
Silicone O-Ring Supplier India — FDA Food Pharma Grade — KELOR
Silicone O-Rings (VMQ) sourced from verified manufacturers — FDA 21 CFR 177.2600 compliant · USP Class VI · Food Grade · Pharma GMP · High Temperature -60°C to +230°C — DIN 3771 Metric / AS568 Inch / ISO 3601 / JIS B2401 — ID 1 mm to 500 mm — 50 to 70 Shore A standard — Red / Translucent / White / Orange colour-coded — OEM bulk supply as per customer drawing or sample — food processing · dairy · pharma · medical · biotech · HVAC hot water.
MOQ 1,000 Nos · MOV ₹50,000 · Custom to Drawing Available · GST Invoice (GSTIN: 24AKLPP6499B1ZT) · Pan India Dispatch · 2-Hour Quote
Silicone O-Ring Product Photos — KELOR Industrial Seals
Silicone O-Rings — Food Grade · Red / Translucent — FDA 21 CFR 177.2600 Compliant — Food, Pharma, Dairy Application
White FDA-Grade Silicone O-Rings — USP Class VI · Pharma GMP Equipment — High Purity Sealing
🏭 OEM & Bulk Supply — Custom Silicone O-Rings as Per Your Drawing or Sample
We source Silicone O-rings from verified, quality-audited manufacturers — not from unverified trading channels. Every supplying manufacturer is vetted for compound consistency, dimensional accuracy, and compliance documentation. This means:
- ✅ Custom sizes — any ID x CS not in standard DIN/AS568 range, manufactured to your drawing dimensions with ±0.05 mm tolerance
- ✅ Custom silicone compounds — FDA food grade, USP Class VI pharma grade, high-tear-strength, high-temperature, metal-detectable, and platinum-cured medical grades on request
- ✅ OEM batch supply — consistent compound, hardness, and dimensional tolerance batch-to-batch for food machinery OEMs, pharma equipment manufacturers, and dairy plant assemblers
- ✅ Sample matching — send us your worn or failed silicone O-ring; we identify the compound grade by testing and match it for replacement supply
- ✅ Private label — silicone O-rings supplied in your brand packaging with your part number and batch traceability
- ✅ Competitive pricing — sourced directly from verified manufacturers; 20–35% lower than multi-layer trading-house prices at equivalent compound quality
MOQ: 1,000 Nos per size per compound grade · MOV: ₹50,000 per order
A Silicone O-ring (VMQ — Vinyl Methyl Silicone Quartz) is a torus-shaped elastomeric seal made from silicone rubber compound, designed for applications demanding extreme temperature resistance, biocompatibility, and food-contact compliance. Unlike NBR or EPDM, silicone O-rings operate reliably from -60°C to +230°C, making them the preferred sealing choice for food processing equipment, pharmaceutical manufacturing plants, dairy pasteurisation lines, medical devices, and any application where the sealed media contacts food, drugs, or the human body. Silicone is inherently inert, odourless, tasteless, and non-toxic — which is why FDA 21 CFR 177.2600 and USP Class VI compliance is achievable with the correct compound grade.
Krishna Industries (KELOR), Ahmedabad, is a silicone O-ring supplier in India sourcing from verified, quality-audited manufacturers and supplying directly to food machinery OEMs, pharmaceutical equipment manufacturers, dairy plant operators, medical device assemblers, and industrial MRO stores across India. Every batch is sourced from certified silicone compound — food grade or pharma grade as specified — with material test report (MTR) and batch traceability available on request. MOQ 1,000 Nos per size per grade. MOV ₹50,000 per order. GST invoice. Pan India dispatch from Ahmedabad.
Silicone O-Ring Grades — Which One Does Your Application Need?
Not all silicone O-rings are the same. The compound grade determines whether the O-ring is legally permitted for food contact, pharmaceutical drug contact, or medical implant use. Specifying “silicone O-ring” without the grade is the most common mistake we see — and it can result in regulatory non-compliance, product recall, or seal failure. Use this guide to select the correct grade before ordering.
Commercial Grade Silicone
General Purpose · Non-Food Contact- Standard silicone compound for industrial static seals
- Temperature range -60°C to +230°C
- Hot air, hot water (non-potable), HVAC, and electrical insulation
- Not for food contact, pharma, or drinking water
- Most economical silicone grade
FDA Food Grade Silicone
FDA 21 CFR 177.2600 · Food Contact Compliant- Compound complies with FDA 21 CFR 177.2600 for repeated food contact
- Non-toxic, odourless, tasteless — does not contaminate food
- Food processing, dairy, beverage, bottling, confectionery
- Available in red, translucent, white colour-coded for food-line identification
- Material test report (MTR) confirming FDA compliance available on request
USP Class VI Pharma Grade
USP Class VI · Pharma GMP Equipment- Compound meets USP Class VI biocompatibility testing requirements
- Pharmaceutical manufacturing equipment — reactors, fermenters, chromatography columns
- Drug contact applications requiring extractables and leachables documentation
- White or translucent colour for visual contamination detection
- Batch traceability and material declaration on request
Platinum-Cured Medical Grade
Platinum Catalyst · Medical Device · Implant- Platinum-catalysed addition-cure silicone — zero peroxide byproducts
- Medical devices, surgical instruments, implant applications
- Biocompatible — ISO 10993 compliant on request
- Ultra-low extractables for critical drug delivery and infusion systems
- Subject to additional qualification — specify at inquiry stage
Metal-Detectable Silicone
Metal Fragment Detection · Food Safety- Silicone compound loaded with metal-detectable particles
- Detected by standard metal detectors on food processing lines
- Prevents silicone O-ring fragments from entering food product undetected
- Mandatory in many food factories for HACCP compliance
- Blue colour standard — highest visual contrast against food
High-Tear-Strength Silicone
Tear Resistant · Dynamic / Semi-Dynamic Seals- Reinforced silicone compound with improved tear propagation resistance
- Suitable for semi-dynamic sealing applications where standard silicone tears
- Valve stem seals with slow rotational movement, door seals, lid gaskets
- Tear strength 25–40 kN/m vs 10–15 kN/m for standard silicone
- Available in food grade and pharma grade compounds
⚠️ Regulatory Warning: Commercial-grade silicone O-rings must NOT be used in food contact, pharmaceutical, or drinking water applications. Only FDA 21 CFR 177.2600 compliant or USP Class VI certified compounds are legally permitted for food and drug contact respectively. Using non-compliant silicone in food/pharma equipment can result in product contamination, regulatory action, and product recall. Always specify the required grade at time of inquiry — we confirm the correct compound and provide material test documentation with each batch.
💰 Silicone O-Ring Price List — Approximate Ex-Works Ahmedabad, GST Extra (Valid for 30 Days · Project Pricing on WhatsApp)
Silicone O-Ring Price — FDA Food Grade, DIN 3771 Standard Sizes
Below prices are for Silicone (VMQ) FDA Food Grade, 50–70 Shore A, red/translucent, DIN 3771 standard sizes, MOQ 1,000 Nos, MOV ₹50,000. For USP Class VI pharma grade and other specialty grades, add 30–50% over food grade prices. See the grade price comparison table below.
| ID Range (mm) | Cross Section (mm) | Typical DIN Ref | Price / Pc (INR) | MOQ |
|---|---|---|---|---|
| 5 – 14 | 1.5 – 2.0 | DIN 3771 A 5×1.5 to 14×2 | ₹4 – ₹10 | 1,000 Nos |
| 15 – 30 | 2.0 – 2.5 | DIN 3771 A 15×2 to 30×2.5 | ₹6 – ₹15 | 1,000 Nos |
| 32 – 60 | 2.5 – 3.5 | DIN 3771 A 32×3.5 to 60×3.5 | ₹12 – ₹28 | 1,000 Nos |
| 65 – 100 | 3.5 – 5.0 | DIN 3771 A 65×5.3 to 100×5.3 | ₹22 – ₹50 | 1,000 Nos |
| 105 – 200 | 5.0 – 7.0 | DIN 3771 A 109×5.3 to 200×7 | ₹40 – ₹100 | 1,000 Nos |
| 210 – 350 | 5.0 – 7.0 | DIN 3771 A 210×7 to 350×7 | ₹85 – ₹260 | 1,000 Nos |
| 360 – 500 | 7.0 – 12.0 | DIN 3771 B / Cord & Vulcanise | ₹200 – ₹750 | 1,000 Nos |
Silicone O-Ring Grade Price Comparison — Per Piece (Approx.)
Prices shown for ID 25–50 mm x CS 2.5–3.5 mm range, MOQ 1,000 Nos, MOV ₹50,000, DIN 3771. Larger sizes and tighter tolerances change per-piece rate.
Commercial Grade
₹8–18
Industrial static · HVAC · Non-food
FDA Food Grade
₹12–30
Food contact · Dairy · Beverage
USP Class VI
₹18–45
Pharma GMP · Drug contact
Platinum-Cured
₹30–70
Medical device · Implant · ISO 10993
Metal-Detectable
₹25–55
HACCP food safety · Blue colour
High-Tear-Strength
₹15–38
Semi-dynamic · Valve stems · Lids
💡 Bulk pricing note: Above prices are approximate for standard sizes at MOQ 1,000 Nos per size (MOV ₹50,000 per order). Custom sizes (non-standard ID x CS) are priced on drawing — WhatsApp your drawing for quote within 24 hours. Prices vary with silicone raw material market — firm quote provided on WhatsApp. For project BOM pricing (50+ sizes mixed): WhatsApp your BOM — project pricing within 2 hours.
📥 Need Silicone O-Ring Price Right Now? — WhatsApp, Get Quote in 2 Hours
Share your requirement: Grade (FDA / USP Class VI / Medical) · Size (ID x CS or AS568 dash) · Quantity · Delivery city — Instant approximate pricing on WhatsApp
📲 WhatsApp Your Requirement 📧 Email InquirySilicone O-Ring vs Other Materials — When Silicone Is the Right Choice
Silicone is not a universal replacement for every O-ring material. It excels in specific conditions — extreme temperature, food/pharma compliance, and inertness — but has significant limitations in others. Selecting silicone where NBR or EPDM is the correct choice is a costly mistake. This comparison guide helps you specify the right material for your actual service conditions.
Silicone (VMQ) — This Page
Food · Pharma · Extreme Temperature- Food contact — FDA 21 CFR 177.2600 compliant grades
- Pharmaceutical GMP — USP Class VI certified grades
- Extreme temperature: -60°C to +230°C
- Inert, non-toxic, odourless, tasteless
- Medical device and implant grades available
NBR (Nitrile)
Buna-N · Oil · Hydraulic · General Purpose- Mineral oil, hydraulic oil, diesel, fuel
- Compressed air (without ozone)
- LPG, natural gas (low aromatic)
- Best abrasion resistance among common elastomers
- Most economical for oil and fuel service
EPDM
Ethylene Propylene · Water / Steam Specialist- Hot water and steam up to 150°C
- HVAC cooling water with biocide
- Potable water (FDA / WRAS grade available)
- Ozone and UV-exposed outdoor service
- Brake fluid and alcohol service
Viton (FKM)
Fluorocarbon · Chemical & High-Temp- Petroleum and aromatic solvents
- Hot oil above 120°C
- Concentrated acids (nitric, sulphuric)
- Refinery process service
- Chemical processing valve seals
PTFE (Teflon)
Universal Chemical Resistance- Virtually all chemicals including concentrated acids
- Pharmaceutical and food GMP service
- Cryogenic applications (LN2, LO2)
- High-purity water systems
- Strong oxidisers (nitric acid, bromine)
HNBR
Hydrogenated Nitrile · High-Temp Oil- Hot oil and fuel above 120°C (NBR limit)
- Oilfield and downhole equipment
- H2S (sour gas) service
- Automotive power steering, A/C
- Steam/oil combination service
Silicone O-Ring Hardness — Why 50 Shore A Is Standard and When to Use 60 or 70
Hardness (Shore A durometer) selection for silicone O-rings is different from NBR or EPDM. Silicone is inherently softer and less resistant to extrusion than other elastomers at the same Shore A value. This means a 70 Shore A silicone O-ring has lower extrusion resistance than a 70 Shore A NBR O-ring. Most food and pharma applications use 50 Shore A for better conformability on sanitary fitting surfaces, but higher pressures require harder compounds.
| Hardness | Typical Use | Characteristic | Specify When |
|---|---|---|---|
| 40–50 Shore A ⭐ | Standard for silicone — food and pharma fittings | Excellent conformability to sanitary fitting surfaces; good compression set for static face seals; low extrusion resistance | Tri-clamp fittings, sanitary ferrules, food valve face seals, pharma reactor lid seals — all low-pressure food/pharma static seals |
| 60 Shore A | Medium — dynamic or semi-dynamic silicone seals | Better extrusion resistance than 50 Shore A; slightly less conformable; acceptable for slow dynamic movement | Slow-rotating valve stems, door gaskets, lid seals with moderate pressure, semi-dynamic food equipment |
| 70 Shore A | Hard — high-pressure silicone applications | Maximum extrusion resistance available in silicone; reduced conformability; higher compression set | Higher pressure static seals where silicone temperature range is essential but pressure exceeds 50 Shore A capability |
| 80–90 Shore A | Very hard — rarely used in silicone | Silicone at 80+ Shore A becomes brittle with poor elastic recovery; generally not recommended | Avoid — if 70 Shore A silicone is insufficient for pressure, switch to Viton or PTFE encapsulated instead |
💡 Silicone hardness rule of thumb: Use 50 Shore A for all food/pharma static face seals and sanitary fittings. Use 60 Shore A for semi-dynamic food equipment. Use 70 Shore A only when both high temperature and moderate pressure are present. If pressure exceeds 70 Shore A silicone capability, do not use harder silicone — switch material to Viton or PTFE encapsulated O-ring instead.
Silicone O-Ring Size Standards — DIN 3771, AS568, ISO 3601, JIS B2401
We supply silicone O-rings to all four major dimensional standards used in India. Specify the standard and size designation clearly on your purchase order — do not mix standards as groove dimensions differ between systems. Silicone O-rings are dimensionally identical to NBR/EPDM O-rings of the same standard size; the material difference is in compound and hardness only.
| Standard | System | How to Specify | Used In India For |
|---|---|---|---|
| DIN 3771 | Metric (mm) | ID x CS in mm — e.g. “40 x 3.5 Silicone 50 Shore A FDA DIN 3771” | Most Indian food and pharma equipment; metric sanitary fittings; European-origin process equipment |
| AS568 | Imperial (inch) | Dash number — e.g. “-214 AS568 Silicone FDA” | US-standard sanitary fittings (Tri-Clamp); American-designed food processing equipment |
| ISO 3601 | Metric (mm) | Size code — ID x CS to ISO table | International specification projects — equivalent to DIN 3771 in most sizes |
| JIS B2401 | Metric (mm) | P-series (piston/rod) or G-series (face seal) | Japanese OEM food and pharma equipment — packaging machinery from Japanese manufacturers |
| Custom (Drawing) | Any | ID x CS + tolerance, Shore A, silicone grade (FDA/USP/medical) | Non-standard sizes for any OEM application — manufactured to your drawing |
Types of Silicone O-Rings We Supply
FDA Food Grade Silicone O-Ring
FDA 21 CFR 177.2600 · Food Contact- FDA 21 CFR 177.2600 compliant compound for repeated food contact
- Red, translucent, white colour-coded for food-line identification
- DIN 3771 / AS568 / ISO 3601 / JIS B2401 standard dimensions
- 50 Shore A standard; 40–70 Shore A available
- MOQ: 1,000 Nos per size per grade
USP Class VI Pharma Grade O-Ring
USP Class VI · Pharma GMP- USP Class VI biocompatibility tested compound for drug contact
- White or translucent for visual contamination detection in clean rooms
- Extractables and leachables data available on request
- Batch traceability with material declaration per batch
- MOQ: 1,000 Nos per size per grade
Custom / Non-Standard Silicone O-Ring
As Per Drawing · Any ID x CS- Any ID from 1 mm to 500 mm, any CS from 1 mm to 15 mm
- Tight tolerances: ±0.05 mm for precision food and pharma fittings
- All silicone grades available — FDA, USP, medical, metal-detectable
- First article samples before bulk production
- MOQ: 1,000 Nos per size per grade
Metal-Detectable Silicone O-Ring
HACCP · Food Safety · Blue Colour- Silicone compound loaded with metal-detectable particles
- Detected by standard inline metal detectors on food lines
- Blue colour for maximum visual contrast against food products
- Essential for HACCP-compliant food manufacturing plants
- MOQ: 1,000 Nos per size
High-Temperature Silicone O-Ring
Continuous +230°C · Static Seals- Silicone compound formulated for continuous service at 230°C
- Oven door seals, autoclave lid seals, hot air duct gaskets
- Low compression set at elevated temperature — maintains seal force
- Available in food grade and commercial grade
- MOQ: 1,000 Nos per size per grade
Cord (Vulcanised) Silicone O-Ring
Large Diameter · On-Site Fabrication- Silicone cord cut to length and vulcanised (bonded) to form O-ring
- For very large diameter O-rings above 500 mm not economical to mould
- Available in FDA food grade silicone cord
- Dimensional accuracy ±1–2 mm — suitable for large static face seals
- MOQ: 1,000 Nos per size per grade
Silicone (VMQ) O-Ring Technical Properties — Reference Data
Below are the typical physical and chemical properties of our silicone O-ring compounds. Values are typical and may vary by grade and hardness. Confirm specific values for your application at the inquiry stage — we provide compound data sheets on request.
| Property | Commercial Grade | FDA Food Grade | USP Class VI |
|---|---|---|---|
| Hardness (Shore A) | 40 – 70 | 40 – 70 | 40 – 70 |
| Tensile Strength (MPa) | 6 – 9 | 7 – 10 | 8 – 11 |
| Elongation at Break (%) | 150 – 300 | 150 – 300 | 200 – 350 |
| Tear Strength (kN/m) | 10 – 15 | 10 – 15 | 12 – 18 |
| Compression Set 22h @ 175°C (%) | 15 – 25 | 12 – 22 | 10 – 20 |
| Operating Temperature Range | -60°C to +230°C | -60°C to +230°C | -60°C to +230°C |
| Specific Gravity | 1.10 – 1.20 | 1.10 – 1.20 | 1.10 – 1.15 |
| Food Contact Compliance | No | FDA 21 CFR 177.2600 | FDA + USP Class VI |
| Flame Resistance | Self-extinguishing | Self-extinguishing | Self-extinguishing |
| Colours Available | Red, translucent, orange, grey | Red, translucent, white, orange, blue | White, translucent |
Silicone O-Ring Chemical Resistance — Quick Reference
Silicone O-rings have excellent resistance to many chemicals but poor resistance to petroleum-based fluids, concentrated acids, and certain solvents. Use this table to quickly verify chemical compatibility before specifying silicone for your application. When in doubt, WhatsApp us the media name and concentration — we confirm compatibility within 2 hours.
| Media | Concentration | Temp | Resistance | Notes |
|---|---|---|---|---|
| Water (hot / cold) | 100% | Up to 150°C | Excellent | Silicone is ideal for hot water service |
| Steam (low pressure) | — | Up to 130°C | Good | Avoid continuous high-pressure steam — use EPDM instead |
| Dilute acids (acetic, citric) | Up to 10% | Room temp | Good | Food-grade acids in food processing |
| Dilute alkalis (NaOH) | Up to 10% | Room temp | Fair | CIP cleaning solutions — check concentration |
| Alcohol (ethanol, isopropanol) | 100% | Room temp | Good | Pharma and food sanitisation |
| Hydrogen peroxide | Up to 30% | Room temp | Good | Aseptic pharma and food processing |
| Mineral oil / Hydraulic oil | 100% | Any | Poor | Silicone swells significantly — use NBR or HNBR |
| Diesel / Fuel / Petrol | 100% | Any | Poor | Silicone swells and degrades — use NBR or Viton |
| Ketones (MEK, acetone) | 100% | Any | Poor | Causes severe swelling — use Viton or PTFE |
| Concentrated acids (H2SO4, HNO3) | >50% | Any | Poor | Use Viton or PTFE encapsulated instead |
| Ozone / UV exposure | — | Any | Excellent | Silicone is inherently ozone and UV resistant |
| CIP / SIP cleaning solutions | Standard | Up to 130°C | Fair–Good | Depends on solution — confirm at inquiry stage |
OEM Custom Silicone O-Ring — How the Process Works
For OEM bulk orders of custom silicone O-rings (non-standard sizes, special FDA/USP grades, or per-drawing specifications), here is the exact process from inquiry to delivery:
Share Drawing or Sample
WhatsApp your silicone O-ring drawing (ID, CS, tolerance, grade — FDA/USP/medical, Shore A, colour, quantity) — or send a physical sample for compound identification and grade matching.
Grade Confirmation + Quote
We confirm the silicone grade (FDA food / USP pharma / medical), hardness, and dimensional tolerance feasibility within 24 hours. Price and lead time quoted based on MOQ 1,000 Nos per size per grade (MOV ₹50,000 per order).
Sample / Prototype
First article samples (typically 5–10 Nos per size) despatched within 7–14 working days for your dimensional, functional, and food/pharma compliance approval before bulk production.
Bulk Production & Dispatch
On approval: bulk production 15–30 working days (depending on quantity and grade). Material test report (MTR) confirming grade compliance included with each batch. GST invoice. Pan India dispatch.
🔗 Related Silicone O-Ring Pages: Explore our complete silicone sealing range — Silicon O-Ring (General Silicone Range) · FDA Approved Silicone O-Ring (Full FDA Compliance Details) · Silicone O-Ring Price (Complete Price List) · Silicone O-Ring Catalog (Full Size & Grade Reference) — or Request a Custom Quote for your specific requirement.
Silicone O-Ring Applications — OEM & Industrial Markets We Supply
🍽️ Food Processing
FDA food grade silicone O-rings for food processing equipment — mixers, blenders, cookers, conveyors, filling machines, and packaging equipment — non-toxic, odourless, tasteless sealing.
💊 Pharmaceutical GMP
USP Class VI silicone O-rings for pharma reactors, fermenters, chromatography columns, and sterile processing equipment — with extractables data and batch traceability.
🥛 Dairy & Beverage
FDA food grade silicone for pasteurisation lines, homogenisers, cream separators, and bottling equipment — CIP/SIP compatible grades for dairy plant hygiene standards.
🏥 Medical Devices
Platinum-cured medical grade silicone for surgical instruments, drug delivery devices, infusion systems, and respiratory equipment — ISO 10993 biocompatibility compliant.
❄️ HVAC & Hot Water
Silicone O-rings for hot water circulation above EPDM temperature limits, oven door seals, autoclave gaskets, and heat exchanger face seals in high-temperature HVAC service.
⚗️ Biotech & Life Sciences
USP Class VI and platinum-cured silicone for bioreactors, fermenters, filtration systems, and chromatography equipment in biotech and life sciences manufacturing.
🔌 Electrical & Electronics
Silicone O-rings for electrical insulation seals, connector sealing, and outdoor equipment — silicone’s inherent insulation properties and UV/ozone resistance suit these applications.
🔩 MRO & Maintenance
Assortment kits in FDA silicone across DIN 3771 standard sizes for food and pharma plant maintenance stores — colour-coded for easy grade identification during repairs.
Silicone O-Ring Standard Cross Section (CS) Sizes — DIN 3771 Reference
DIN 3771 defines standard cross section diameters. Silicone O-rings use the same CS dimensions as other elastomeric O-rings. The CS selection depends on the groove width in the mating component. Standard CS values used in India for food and pharma fittings:
| Cross Section — CS (mm) | Typical ID Range | Typical Application | Groove Width (mm) |
|---|---|---|---|
| 1.0 mm | 1 – 9 mm | Miniature sanitary fittings, small pharma valve stems | 1.2 |
| 1.5 mm | 4 – 20 mm | Food valve stems, instrument fittings, solenoid valves | 1.8 |
| 2.0 mm | 8 – 45 mm | Food valve bonnets, pharma actuator stems, sanitary connections | 2.4 |
| 2.5 mm | 15 – 75 mm | Tri-clamp ferrule seals, butterfly valve shaft seals, dairy fittings | 3.0 |
| 3.0 mm | 20 – 100 mm | Pharma reactor lid seals, autoclave door seals, food vessel gaskets | 3.6 |
| 3.5 mm | 30 – 200 mm | Food vessel body seals, heat exchanger cover seals, large tri-clamp | 4.2 |
| 5.0 mm | 50 – 300 mm | Large food vessel body seals, manway cover seals, pharma vessel O-ring grooves | 6.0 |
| 7.0 mm | 100 – 500 mm | Very large static face seals, large pharma vessel lid seals | 8.4 |
ℹ️ How to specify for OEM ordering:
Complete specification for a standard FDA silicone O-ring: “40.0 x 3.5 Silicone 50 Shore A FDA Food Grade DIN 3771 — 1,000 Nos”
Complete specification for a USP Class VI O-ring: “ID 62.5 ± 0.2 mm x CS 4.0 ± 0.1 mm, Silicone USP Class VI 50 Shore A, white — as per drawing No. XYZ-123 — 1,000 Nos”
For sample matching: WhatsApp us a photo of the O-ring with a ruler for scale, and the equipment make/model. We identify the grade and match.
Complete specification for a standard FDA silicone O-ring: “40.0 x 3.5 Silicone 50 Shore A FDA Food Grade DIN 3771 — 1,000 Nos”
Complete specification for a USP Class VI O-ring: “ID 62.5 ± 0.2 mm x CS 4.0 ± 0.1 mm, Silicone USP Class VI 50 Shore A, white — as per drawing No. XYZ-123 — 1,000 Nos”
For sample matching: WhatsApp us a photo of the O-ring with a ruler for scale, and the equipment make/model. We identify the grade and match.
How to Order — Silicone O-Rings from KELOR
For Silicone O-Rings (MOQ 1,000 Nos · MOV ₹50,000) — WhatsApp or Email:
1. Grade — Commercial / FDA Food Grade / USP Class VI / Platinum-Cured Medical / Metal-Detectable / High-Tear-Strength
2. Standard — DIN 3771 / AS568 / ISO 3601 / JIS B2401
3. Size — ID x CS in mm (DIN) or Dash number (AS568)
4. Shore A hardness — 50 standard for silicone; specify if different
5. Colour — Red / Translucent / White / Orange / Blue (metal-detectable)
6. Quantity (Nos) — minimum 1,000 per size per grade
7. Delivery location
For Custom Silicone O-Rings — additionally provide:
8. Drawing with ID, CS, tolerances (±mm), and surface finish requirements
9. OR send a physical sample by courier to our Ahmedabad address
10. Batch quantity and annual volume (helps price per piece)
11. First article / prototype samples required? Yes / No
12. Material test report (MTR) required? Yes / No — included free with FDA and USP grades
📱 WhatsApp: +91 93135 43530 | 📧 Email: [email protected]
📍 Address for sample sending: 133/1 Ground Floor, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad – 380004, Gujarat
1. Grade — Commercial / FDA Food Grade / USP Class VI / Platinum-Cured Medical / Metal-Detectable / High-Tear-Strength
2. Standard — DIN 3771 / AS568 / ISO 3601 / JIS B2401
3. Size — ID x CS in mm (DIN) or Dash number (AS568)
4. Shore A hardness — 50 standard for silicone; specify if different
5. Colour — Red / Translucent / White / Orange / Blue (metal-detectable)
6. Quantity (Nos) — minimum 1,000 per size per grade
7. Delivery location
For Custom Silicone O-Rings — additionally provide:
8. Drawing with ID, CS, tolerances (±mm), and surface finish requirements
9. OR send a physical sample by courier to our Ahmedabad address
10. Batch quantity and annual volume (helps price per piece)
11. First article / prototype samples required? Yes / No
12. Material test report (MTR) required? Yes / No — included free with FDA and USP grades
📱 WhatsApp: +91 93135 43530 | 📧 Email: [email protected]
📍 Address for sample sending: 133/1 Ground Floor, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad – 380004, Gujarat
Why Food & Pharma OEMs Choose Krishna Industries for Silicone O-Rings
🏭
Sourced from Verified Manufacturers
We source silicone O-rings from verified, quality-audited manufacturers — not from unverified trading channels. Every supplying manufacturer is vetted for compound consistency, dimensional accuracy, and compliance documentation. Competitive pricing with full compound traceability that food and pharma applications demand.
📋
FDA & USP Grade Certification
Every batch of FDA and USP Class VI silicone O-rings is manufactured from certified compound with material test report (MTR) confirming grade compliance. Batch traceability from raw compound to finished O-ring — critical for food safety audits and pharma GMP inspections.
📐
Custom to Drawing — ±0.05 mm Tolerance
Any ID x CS combination manufactured to your drawing. Tight tolerances ±0.05 mm for precision sanitary fittings, pharma equipment, and food machinery. First article samples before bulk commitment — no risk of receiving out-of-spec O-rings.
🔄
Batch-to-Batch Consistency
Critical for food and pharma OEMs — same compound, same hardness, same dimensional tolerance, same colour across all batches. Material test report with each batch confirming compound grade and conformance to your specification.
⚡
2-Hour Quote Response
Quote within 2 hours on WhatsApp for standard FDA silicone sizes. Custom drawings quoted within 24 hours. First article samples in 7–14 working days. Bulk production 15–30 working days. We understand food and pharma production downtime is expensive.
✅
GSTIN Verified Business
GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B. Full GST-compliant billing. All invoices valid for ITC (Input Tax Credit) claims. Proper business documentation for your vendor approval process.
Get Silicone O-Ring Price — FDA / USP / Medical Grade — 2-Hour Response
FDA Food Grade · USP Class VI · Platinum-Cured · Metal-Detectable · DIN 3771 / AS568 · Custom to Drawing · MOQ 1,000 Nos · MOV ₹50,000 · First Article Samples · MTR Included · GST Invoice · Pan India Dispatch
📲 WhatsApp Inquiry 📧 Email Inquiry📝 Send Your Silicone O-Ring Inquiry — We Reply Within 2 Hours
Silicone O-Ring Quick Specification Summary
| Material | Silicone (VMQ) — Commercial / FDA Food Grade / USP Class VI / Platinum-Cured / Metal-Detectable / High-Tear-Strength |
| Food Compliance | FDA 21 CFR 177.2600 (Food Grade) · USP Class VI (Pharma Grade) |
| Hardness Range | 40 to 70 Shore A (50 Shore A standard for silicone) |
| Temperature Range | -60°C to +230°C (continuous) |
| Standards | DIN 3771 (metric) · AS568 (inch) · ISO 3601 · JIS B2401 |
| ID Range | 1 mm to 500 mm (moulded) · Above 500 mm by cord and vulcanise |
| CS Range | 1.0 mm to 15.0 mm standard; custom on request |
| Dimensional Tolerance | Per DIN 3771 / AS568 standard; ±0.05 mm for precision OEM on request |
| Colours | Red (standard food) · Translucent · White (pharma) · Orange · Blue (metal-detectable) · Custom colour for OEM |
| MOQ | 1,000 Nos per size per grade per batch |
| MOV | ₹50,000 per order (minimum order value) |
| Lead Time — Samples | 7–14 working days |
| Lead Time — Bulk Production | 15–30 working days from sample approval |
| HSN Code | 40169300 (silicone rubber O-rings) |
| GST Rate | 18% |
| GSTIN | 24AKLPP6499B1ZT |
Related Products — Silicone O-Ring Range & KELOR Products
Pan India Silicone O-Ring Supply Coverage
Silicone O-rings dispatched from Ahmedabad to: Mumbai, Pune, Nashik, Aurangabad (Maharashtra — food and pharma cluster) · Chennai, Coimbatore, Bengaluru, Hyderabad, Visakhapatnam (South India — pharma and biotech) · Delhi NCR, Noida, Gurugram, Baddi, Ludhiana (North India — pharma and food processing) · Kolkata, Jamshedpur, Bhubaneswar (East India) · Ahmedabad, Surat, Vadodara, Rajkot, Vapi, Ankleshwar, Dahej, Bharuch (Gujarat — chemical and pharma cluster) · Goa, Puducherry, Sikkim, Himachal Pradesh (pharma manufacturing zones) and all other industrial cities.
Frequently Asked Questions — Silicone O-Rings
What is the difference between FDA food grade and USP Class VI silicone O-rings?
FDA 21 CFR 177.2600 compliance means the silicone compound is approved for repeated food contact — it will not contaminate food with toxic extractables, odours, or tastes. This is the regulatory requirement for any O-ring that contacts food, beverages, or dairy products. USP Class VI goes further — it means the compound has passed biocompatibility testing per United States Pharmacopeia Chapter 87 and 88, including systemic injection, intracutaneous, and implantation tests. USP Class VI is required for O-rings that contact pharmaceutical drugs, biotech process streams, and medical devices. A USP Class VI silicone O-ring is also FDA food-contact compliant, but an FDA food grade O-ring is not automatically USP Class VI compliant. If your application involves drug contact or medical device use, specify USP Class VI. For food and dairy only, FDA food grade is sufficient. We provide material test reports confirming the correct grade compliance with each batch.
Can I use a silicone O-ring in place of an NBR or EPDM O-ring of the same size?
Dimensionally yes — a silicone O-ring in the same DIN 3771 or AS568 size will fit the same groove as an NBR or EPDM O-ring. However, functionally it depends entirely on the service conditions. Silicone is the correct choice when: (1) the service temperature exceeds 120°C continuous (NBR limit) or 150°C (EPDM limit); (2) the O-ring must be food-contact compliant or pharma grade; (3) the media is hot water, alcohol, dilute food acids, or hydrogen peroxide. Silicone is the WRONG choice when: (1) the media is mineral oil, hydraulic oil, diesel, fuel, or any petroleum-based fluid — silicone swells and degrades rapidly; (2) the application involves dynamic sealing with friction — silicone has poor abrasion resistance and tears quickly in dynamic service; (3) the application involves high-pressure hydraulic sealing — silicone has poor extrusion resistance. In these cases, use NBR for oil service, EPDM for water/steam service, or Viton for chemical/high-temperature oil service.
What temperature range do your silicone O-rings handle?
Our silicone O-rings handle -60°C to +230°C continuous service. This is significantly wider than NBR (-40°C to +120°C), EPDM (-40°C to +150°C), and Viton (-20°C to +200°C). The low-temperature flexibility of silicone (-60°C) makes it the preferred choice for cryogenic food freezing equipment and cold chain pharma storage. The high-temperature capability (+230°C) suits oven door seals, autoclave gaskets, and hot air equipment. Note that silicone’s mechanical properties (tensile strength, tear resistance, extrusion resistance) are lower than NBR and EPDM at the same Shore A hardness. For applications requiring both high temperature and high mechanical strength, consider Viton or PTFE encapsulated alternatives.
Why is 50 Shore A the standard hardness for silicone O-rings instead of 70 Shore A?
Silicone rubber is inherently softer and less resistant to extrusion than NBR or EPDM at the same Shore A value. A 70 Shore A silicone O-ring has significantly lower extrusion resistance and tear strength than a 70 Shore A NBR O-ring. For most food and pharma applications — tri-clamp fittings, sanitary ferrules, vessel lid seals, and low-pressure face seals — the sealing surface is smooth and pressure is low, so 50 Shore A provides the best conformability and compression set resistance without any extrusion risk. Using 70 Shore A silicone in these applications results in poor conformability and potential leakage because the harder compound cannot flow into micro-irregularities on the sealing surface. Specify 60 Shore A only for semi-dynamic seals (slow-rotating valve stems), and 70 Shore A only for higher-pressure static seals where silicone’s temperature range is essential but extrusion is a concern.
What colours are available for silicone O-rings and what do they mean?
Silicone O-ring colours serve both practical identification and regulatory purposes in food and pharma plants. Red is the standard food-grade colour — immediately identifies the O-ring as food-contact compliant on the production line. Translucent (semi-clear) indicates high-purity silicone for pharma and biotech — allows visual inspection for contamination. White is USP Class VI pharma grade — provides maximum visual contrast for detecting any particle contamination in clean room environments. Orange indicates high-temperature silicone for oven and autoclave applications. Blue is exclusively for metal-detectable silicone — the blue colour provides maximum visual contrast against virtually all food products, and the compound contains metal-detectable particles for HACCP-compliant food safety lines. Custom colours are available for OEM material identification systems at MOQ 10,000 Nos per colour per size.
What is the price of silicone O-ring in India?
Silicone O-ring price India approximate ex-works Ahmedabad for FDA food grade DIN 3771 standard at MOQ 1,000 Nos (MOV Rs 50,000): ID 5-14mm Rs 4-10 per piece, ID 15-30mm Rs 6-15, ID 32-60mm Rs 12-28, ID 65-100mm Rs 22-50, ID 105-200mm Rs 40-100, ID 210-350mm Rs 85-260, ID 360-500mm Rs 200-750. Commercial grade (non-FDA) is 30-40% lower. USP Class VI pharma grade is 30-50% higher than FDA food grade. Platinum-cured medical grade is 100-150% higher. Metal-detectable is 80-100% higher. Prices are approximate and vary with silicone raw material market — firm quote provided on WhatsApp within 2 hours.
What is the minimum order quantity for silicone O-rings?
MOQ is 1,000 Nos per size per grade per batch for both standard DIN 3771 / AS568 sizes and custom sizes manufactured to drawing. MOV (minimum order value) is Rs 50,000 per order. This lower MOQ suits food and pharma OEMs who typically require more size variety in smaller batch quantities per size. First article samples (5-10 Nos) are provided before bulk production commitment. Mixed size orders welcome — single GST invoice for all sizes and grades.
Do you provide material test reports (MTR) with silicone O-ring batches?
Yes — material test reports confirming compound grade compliance are included free of charge with every batch of FDA food grade and USP Class VI silicone O-rings. The MTR confirms: silicone compound grade (FDA / USP Class VI), hardness (Shore A), tensile strength, elongation, compression set, and colour. For pharmaceutical GMP applications requiring additional documentation — extractables and leachables data, compound declaration, and batch traceability certificates — these are available on request at the inquiry stage. For commercial-grade silicone O-rings, MTR is available on request at no additional charge.
Can silicone O-rings be used in CIP (Clean-In-Place) and SIP (Steam-In-Place) systems?
Yes, with caveats. FDA food grade and USP Class VI silicone O-rings are compatible with most CIP cleaning solutions (caustic NaOH up to 2% concentration, acid CIP with phosphoric/nitric acid up to 2%, and peracetic acid sanitisation) at CIP temperatures up to 95°C. For SIP systems, silicone handles low-pressure steam up to 130°C — but continuous high-pressure steam above 130°C accelerates silicone degradation and increases compression set over time. For SIP above 130°C, EPDM is generally a better material choice. Always confirm the exact CIP/SIP solution concentration, temperature, and cycle time at the inquiry stage — we verify compound compatibility and recommend the correct grade for your specific CIP/SIP protocol.
What is the difference between peroxide-cured and platinum-cured silicone O-rings?
The curing (vulcanisation) method determines the purity and byproducts of the silicone compound. Peroxide-cured silicone is the standard manufacturing method — economical, widely available, and suitable for FDA food grade applications. Trace peroxide decomposition byproducts may remain in the compound, which is acceptable for food contact but may not meet pharma extractables requirements for critical drug contact. Platinum-cured (addition-cure) silicone uses a platinum catalyst instead of peroxide, producing zero peroxide byproducts and significantly lower extractables. Platinum-cured silicone is required for: (1) USP Class VI pharma applications with strict extractables limits; (2) medical devices and implant applications; (3) drug delivery and infusion systems where even trace peroxide byproducts are unacceptable. Platinum-cured silicone costs 80-150% more than peroxide-cured silicone due to the platinum catalyst cost. Specify peroxide-cured for food applications, platinum-cured for pharma and medical applications.
📞 Need Silicone O-Rings for Food or Pharma? — WhatsApp, Get Quote in 2 Hours
FDA Food Grade Rs 4/piece onwards · USP Class VI Rs 18/piece onwards · Platinum-Cured Rs 30/piece onwards · MOQ 1,000 Nos · MOV Rs 50,000 · MTR Included
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