Email:
[email protected]
Phone:
+91 93135 43530
Address:
133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
PTFE (Teflon) O-Ring supplier in Ahmedabad, Gujarat. Solid PTFE (virgin PTFE — white — FDA 21 CFR compliant) and PTFE encapsulated O-ring (FKM/Viton core or silicone core with PTFE outer jacket) — metric sizes per DIN 3771 nominal dimensions (ID…
O-Ring — PTFE (Teflon) — Metric
Price on Request
About Company
- KRISHNA INDUSTRIES
- GST No. : 24AKLPP6499B1ZT
- Ahmedabad, Gujarat, India
- Manufacturer, Traders & Wholesale Supplier
- Year of Establishment : Since 1985
- Annual Turnover : Below Rs. 25 Crore Approx.
- Banker : APANI SAHAKARI BANK LIMITED
- Company CEO : Ruchin Panchal
- Constitution of Business : Proprietorship
- Leading Valve Supplier in India covering Maharashtra, Gujarat, Tamil Nadu, Karnataka, Telangana, Delhi NCR, West Bengal, Rajasthan, Madhya Pradesh, Uttar Pradesh, Punjab, Haryana, Andhra Pradesh, Odisha, Chhattisgarh, Jharkhand, Bihar, Kerala, Assam.
- Major Industrial Supply Cities: Ahmedabad, Vadodara, Rajkot, Surat, Mumbai, Pune, Thane, Nashik, Nagpur, Chennai, Coimbatore, Bengaluru, Hyderabad, Delhi, Noida, Gurugram, Faridabad, Kolkata, Jaipur, Indore, Bhopal, Lucknow, Kanpur, Ludhiana, Visakhapatnam.
Description
PTFE O-Ring Supplier India | Solid PTFE & Encapsulated | Metric Sizes | Universal Chemical Resistance | -200°C to +260°C | FDA Compliant | Chemical / Pharma / Food GMP | KELOR
Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 10 Nos | Types: Solid PTFE (Virgin) & PTFE Encapsulated (FKM / Silicone core)
Temperature: -200°C to +260°C (solid) | Compliance: FDA 21 CFR
PTFE O-Ring Supplier in India
Krishna Industries (KELOR), based in Ahmedabad, Gujarat, supplies PTFE (Teflon) O-rings — solid virgin PTFE (white, FDA 21 CFR compliant) and PTFE encapsulated O-rings (FKM/Viton core or silicone core with PTFE outer jacket) — metric sizes per DIN 3771 nominal dimensions or per customer drawing — temperature range -200°C to +260°C (solid PTFE) — universal chemical resistance — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad.
PTFE O-rings are specified wherever the service fluid is too aggressive for elastomeric O-rings — concentrated acids, strong alkalis, oxidising chemicals, solvents, halogens — or wherever FDA/GMP documentation requires virgin PTFE food-contact compliance. Furthermore, PTFE is the only O-ring material with universal chemical resistance across virtually the entire range of chemicals encountered in Indian process plant, pharmaceutical, and food processing applications.
PTFE vs EPDM vs NBR — When PTFE Is Required
| Service Condition | PTFE O-Ring | EPDM O-Ring | NBR O-Ring |
|---|---|---|---|
| Concentrated acids (HCl, H₂SO₄, HNO₃) | ✅ Resists all standard concentrations | ❌ Degrades in concentrated acid | ❌ Degrades in acid |
| Strong alkalis (NaOH, KOH) | ✅ Excellent resistance | Moderate — degrades in concentrated NaOH | ❌ Degrades in strong alkali |
| Oxidising chemicals (H₂O₂, Cl₂, Br₂) | ✅ Resists oxidising agents | Moderate only | ❌ Attacked by oxidising chemicals |
| Solvents (acetone, MEK, THF) | ✅ Resists most solvents | ✅ Resists ketones/esters (EPDM strength) | ❌ Swells in most solvents |
| High temperature above 150°C | ✅ Up to 260°C — beyond EPDM limit | Up to 150°C only | Up to 120°C only |
| Cryogenic — below -40°C | ✅ Down to -200°C — LNG, liquid nitrogen | Down to -40°C only | Down to -40°C only |
| FDA / GMP food and pharma compliance | ✅ Virgin PTFE FDA 21 CFR compliant — no plasticisers, no fillers — mandatory for product-contact seals in pharma and food GMP | Food grade EPDM available — less stringent compliance documentation than virgin PTFE | Not typically food grade |
| Cost | Higher — premium material — justified only for aggressive service or GMP compliance requirement | ✅ Lower — adequate for most water and HVAC service | ✅ Lowest — standard for oil and compressed air |
Solid PTFE O-Ring vs PTFE Encapsulated O-Ring
| Feature | Solid PTFE O-Ring | PTFE Encapsulated O-Ring |
|---|---|---|
| Construction | Machined or moulded from virgin PTFE rod — 100% PTFE — white colour | Elastomeric core (FKM/Viton or silicone) with thin PTFE outer jacket — PTFE on outside only |
| Chemical Resistance | ✅ Universal — 100% PTFE contact with fluid — maximum chemical resistance | ✅ PTFE jacket provides excellent chemical resistance — core protected from fluid contact |
| Elasticity / Flexibility | Very low — PTFE does not spring back like rubber — requires precise groove dimensions and higher squeeze | ✅ Higher — elastomeric core provides rubber-like springback — easier to seal at lower squeeze — better for imperfect groove surfaces |
| Temperature Range | ✅ -200°C to +260°C — widest range — cryogenic to high temp | FKM core: -20°C to +200°C / Silicone core: -60°C to +200°C |
| Cold Flow (Creep) | PTFE creeps under sustained load — groove must prevent extrusion — torque control essential | ✅ Elastomeric core resists creep — encapsulated O-ring less prone to cold flow than solid PTFE |
| FDA Compliance | ✅ Virgin PTFE FDA 21 CFR — maximum documentation for pharma and food GMP | Depends on core material — FKM core also FDA compliant — specify at order |
| Specify For | ✅ Ball valve seat backup seals, static face seals in chemical equipment, cryogenic service, very high temperature, pharma GMP product-contact static seals | ✅ Dynamic seals in chemical pumps and equipment, agitator shaft seals, seals requiring rubber flexibility with PTFE chemical resistance, less-than-perfect groove surfaces |
Critical Note — PTFE O-Ring Groove Design
PTFE O-rings require different groove dimensions from rubber O-rings. Using DIN 3771 rubber groove dimensions for PTFE O-rings causes leakage. Therefore, always specify the groove design or provide a groove drawing when ordering PTFE O-rings.
- Higher squeeze required: Solid PTFE needs 20–30% diametral squeeze vs 15–20% for rubber — PTFE does not self-energise under fluid pressure like rubber
- Tighter radial clearance: PTFE cold flow (creep) means the gap between piston/shaft and bore must be minimised — wider clearance allows PTFE to extrude and fail
- Groove surface finish: PTFE is less forgiving of rough groove surfaces than rubber — Ra 0.8 micron or better for static seals, Ra 0.4 micron for dynamic
- Encapsulated O-ring exception: PTFE encapsulated O-rings can use standard rubber O-ring groove dimensions in most applications because the elastomeric core provides the springback and self-energisation
Technical Specifications
| Parameter | Solid PTFE O-Ring | PTFE Encapsulated O-Ring |
|---|---|---|
| Material | Virgin PTFE (100% PTFE, no fillers) — white | PTFE outer jacket — FKM/Viton core or Silicone core |
| Temperature | -200°C to +260°C | FKM core: -20°C to +200°C / Silicone core: -60°C to +200°C |
| Chemical Resistance | Universal — resists virtually all chemicals except molten alkali metals and elemental fluorine | Excellent — PTFE jacket provides universal outer chemical resistance |
| FDA Compliance | ✅ FDA 21 CFR — food and pharma contact compliant | ✅ FDA compliant (both PTFE and FKM/silicone food grade available) |
| Size Specification | Per DIN 3771 nominal ID x CS / per customer drawing | Per DIN 3771 nominal ID x CS / per customer drawing |
| Standard Range | ID 2mm to 500mm — CS 1.5mm to 7.0mm | ID 5mm to 300mm — CS 1.5mm to 6.0mm |
| Colour | White (virgin PTFE standard) | White or beige jacket — core colour not visible |
| MOQ | 10 Nos standard / 1 No for large custom sizes | 10 Nos standard |
| HSN Code | 39269090 | 40169990 |
Applications in Indian Industries
Chemical Plants — Aggressive Process Sealing
Solid virgin PTFE O-rings for static face seals in chemical reactor covers, heat exchanger channel flanges, chemical pump body seals — wherever concentrated acid, alkali, or oxidising chemical attacks EPDM and NBR. Furthermore, chemical plants at Ankleshwar, Vapi, and Dahej GIDC use PTFE O-rings extensively in HCl, H₂SO₄, chlorine, and bromine process equipment where no elastomeric O-ring survives service conditions.
Pharmaceutical GMP Piping and Equipment
Virgin PTFE O-rings for product-contact static seals in pharmaceutical manufacturing equipment — tablet press, fluid bed dryer, API synthesis reactor, filtration equipment. Virgin PTFE FDA 21 CFR compliance is documented in the equipment technical file for USFDA inspection. Moreover, PTFE encapsulated O-rings (FKM core) for valve stem seals and pump shaft seals in GMP utility piping where elastomeric seal compliance documentation is required.
Food Processing Equipment
Virgin PTFE O-rings for product-contact seals in food processing pumps, homogenisers, filling machines, and heat exchangers. PTFE FDA 21 CFR compliant and FSSAI acceptable for food contact use. PTFE encapsulated O-rings for agitator shaft seals and rotary valve seals in food mixing and conveying equipment.
Ball Valve Seat Backup Seals
Solid PTFE O-ring as backup seal behind the main PTFE seat in ball valves — provides secondary sealing if primary seat wears — standard design in API 6D and API 602 forged ball valves for critical service. Furthermore, PTFE backup O-ring maintains seat position in the body groove during thermal cycling in high temperature service.
Related Products — Krishna Industries (KELOR)
- NBR O-Ring — DIN 3771 Metric — nitrile O-ring for oil, fuel, and compressed air service — where PTFE chemical resistance is not required
- EPDM O-Ring — DIN 3771 Metric — EPDM for hot water, steam, HVAC — where PTFE is over-specified
- PTFE Valve Seat — complete PTFE seat assembly for ball valve replacement — the primary seat that PTFE backup O-rings complement
- SS316 Ball Valve — CF8M body with PTFE seat — the valve that uses PTFE seat backup O-rings in aggressive chemical service
- SS316 Y Strainer — upstream of ball and globe valves on chemical plant lines where PTFE O-rings protect valve seating surfaces
Frequently Asked Questions
1. What is the difference between solid PTFE O-ring and PTFE encapsulated O-ring?
A solid PTFE O-ring is machined entirely from PTFE rod or moulded from PTFE powder — 100% PTFE, maximum chemical resistance, temperature range -200°C to +260°C. However, solid PTFE has very low elasticity and requires precise groove design with higher squeeze than rubber. A PTFE encapsulated O-ring has an elastomeric core (FKM/Viton or silicone) with a thin PTFE outer jacket. The PTFE jacket provides chemical resistance while the elastomeric core provides the rubber-like springback and flexibility. Encapsulated O-rings seal more easily than solid PTFE and can be used in standard rubber O-ring grooves in many applications. Specify solid PTFE for maximum chemical resistance, cryogenic, and very high temperature. Specify encapsulated for dynamic seals and applications requiring elastomeric flexibility.
2. Why does a PTFE O-ring need different groove dimensions from a rubber O-ring?
Rubber O-rings are elastic — they spring back under pressure and self-energise (fluid pressure pushes the O-ring harder into the seal gap). PTFE does not spring back — it requires the initial compression from the groove squeeze to create and maintain the seal throughout service. Furthermore, PTFE undergoes cold flow (creep) under sustained load — it slowly extrudes into any available gap. Therefore, PTFE O-ring grooves need tighter radial clearance to prevent extrusion, slightly higher diametral squeeze for adequate sealing force, and better surface finish. Using a rubber O-ring groove with a PTFE O-ring typically results in inadequate squeeze and leakage from day one of service.
3. Is virgin PTFE always required for pharmaceutical and food applications?
Virgin PTFE (uncompounded — no fillers or additives) is FDA 21 CFR §177.1550 compliant and is the standard specification for product-contact seals in pharmaceutical manufacturing and food processing. Filled PTFE grades (glass-filled, carbon-filled, graphite-filled) may not be FDA compliant depending on the filler material and loading — carbon-filled PTFE is generally acceptable but requires individual material compliance verification. For GMP documentation purposes, always specify virgin PTFE with FDA compliance certificate when the O-ring is in product contact or potentially product-contact service. For non-product-contact utility service in the same plant, filled PTFE may be acceptable and offers better wear and creep resistance.
4. How do I specify a custom PTFE O-ring size?
Provide the inner diameter (ID) and cross section cord diameter (CS) in millimetres — the same ID x CS format as DIN 3771 metric O-rings. Alternatively, provide a drawing with the O-ring cross section groove dimensions and the mating equipment material — we advise on the correct PTFE O-ring dimensions for that groove. For valve replacement O-rings, provide the valve make, model, and part number if known, or the old O-ring dimensions measured with a calliper. PTFE O-rings are manufactured to custom dimensions with short lead times for sizes not held in stock. WhatsApp dimensions or drawing for pricing within 2 hours.
5. What is the MOQ?
MOQ is 10 Nos for standard metric sizes. For large or custom sizes (ID above 200mm), MOQ is 1 No as these are made to order. For pharmaceutical and food GMP applications, provide the required compliance documentation (FDA 21 CFR, RoHS, REACH) at order stage so the correct virgin PTFE grade with documentation is supplied. GST invoice with every order. Pan India dispatch from Ahmedabad.
Conclusion
Krishna Industries (KELOR) supplies PTFE O-rings — solid virgin PTFE (FDA 21 CFR compliant, white) and PTFE encapsulated (FKM/Viton core or silicone core) — metric sizes per DIN 3771 nominal dimensions or per customer drawing — temperature -200°C to +260°C (solid) — universal chemical resistance — for chemical plant aggressive process sealing, pharmaceutical GMP product-contact seals, food processing equipment seals, and ball valve seat backup seals — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad. WhatsApp dimensions (ID x CS in mm) or customer drawing for pricing within 2 hours.
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