Kaxite Sealing manufactures PTFE ring gaskets precision-machined from 100% virgin PTFE resin, producing ring-joint seals in R-series, oval, octagonal and square-cut profiles. Chemically inert across pH 0–14, service range -200 to +260 °C, pressure rating up to 1500 psi, specific gravity 2.15–2.20 g/cm³, tensile strength 25–35 MPa and compression set below 15%. Supplied to ASME B16.20, API 6A and DIN standards, with virgin, glass-filled, carbon-filled and graphite-filled grades. Procurement teams choose us for factory-direct bulk pricing, full material traceability and 7–15 day lead times.
Three reasons procurement teams in chemical, petrochemical and pharmaceutical industries specify Kaxite as their PTFE gaskets supplier.
Buy straight from the machining line. No trading markup, no hidden broker fees — landed cost reductions of 15–30% compared with reseller channels. MOQ from 10 pcs per size.
Every batch ships with a material certificate of analysis, FDA / USP Class VI declaration and dimensional inspection report. Full audit trail from resin lot to delivery.
Standard R-series ship in 7–15 days. Custom IDs/ODs and filled PTFE grades ship in 15–25 days. OEM marking, laser part numbers and custom packaging available.
Precision-machined from 100% virgin PTFE to ASME B16.20 and API 6A ring-joint profiles. Available in four engineered grades — virgin, glass-filled, carbon-filled and graphite-filled PTFE — to cover chemical transfer, petrochemical, pharmaceutical and high-purity service.
| Ring No. (R) | Nominal Pipe Size | Outer Diameter | Inner Diameter | Cross-Section | Pressure Class |
|---|---|---|---|---|---|
| R11 | 1/2" | 34.1 mm | 21.8 mm | 6.4 mm | 1500 – 2500 lb |
| R23 | 1" | 50.8 mm | 35.1 mm | 7.9 mm | 1500 – 2500 lb |
| R37 | 2" | 73.0 mm | 54.0 mm | 9.5 mm | 900 – 2500 lb |
| R49 | 3" | 97.6 mm | 76.2 mm | 10.7 mm | 900 – 2500 lb |
| R65 | 6" | 165.1 mm | 136.5 mm | 14.3 mm | 600 – 1500 lb |
| R76 | 10" | 231.8 mm | 203.2 mm | 14.3 mm | 600 – 900 lb |
Reactor feed lines, heat exchangers and piping flange joints handling aggressive acids, alkalis and solvents. Pairs with our pure PTFE gaskets for standard flange sealing.
Wellheads, Christmas trees and sour service ring-joint flanges where metal gaskets corrode. See our modified PTFE gaskets for high-pressure variants.
Sterile fluid lines, fermenters and WFI loops requiring FDA and USP Class VI compliance with zero extractables. Pairs with our PTFE envelope gaskets for lined service.
Sanitary process flanges, CIP / SIP loops and aseptic lines where non-stick and FDA 21 CFR 177.1550 compliance are mandatory.
High-purity gas and chemical delivery systems where ultra-low extractables and dimensional stability matter. Pairs with our PTFE tubes for full flow-path sealing.
Steam, condensate and cooling-water flange joints in high-temperature service. Pairs with our PTFE hoses and PTFE packing in ancillary connections.
Selection is based on your flange groove design. First identify the flange standard (ASME B16.20, API 6A, DIN). Second, determine the Ring Number or groove type (R-series, oval or octagonal). The ring number is typically stamped on the flange face. Always match the gasket cross-section to the groove dimensions precisely — undersized or oversized gaskets compromise the seal.
In many services, yes — with important considerations. PTFE gaskets offer superior corrosion resistance and are softer than metal gaskets, requiring lower bolt torque and reducing flange stress. However, they have different compression and creep relaxation characteristics. Consult the flange manufacturer and recalculate required bolt load before substitution.
Virgin PTFE is 100% pure, offering maximum chemical resistance and purity — the standard for FDA and USP Class VI service. Filled PTFE compounds add glass, carbon, graphite or bronze to improve compressive strength, reduce creep, enhance thermal conductivity or lower cost, but may slightly reduce chemical resistance in certain media.
Ensure flange faces and the groove are clean, dry and scratch-free. Place the gasket carefully into the groove. Follow a star-pattern bolting sequence and torque in multiple incremental passes (e.g. 30%, 60%, 100% of final torque). Refer to ASME PCC-1 or equipment-specific guidelines — PTFE torque values are generally lower than for metal gaskets.
Failure signs include visible leakage, extrusion from the groove (over-compression or excessive pressure) and gasket hardening or cracking from thermal cycling beyond limits or attack by specific aggressive agents. Under stable conditions within specifications, Kaxite PTFE ring gaskets can last for many years. Regular inspection during maintenance shutdowns is recommended.
Absolutely. While we stock a comprehensive range of standard PTFE ring gaskets, our engineering team develops custom solutions — non-standard sizes, prototypes for new equipment, filled-PTFE compounds for specific performance needs, and gaskets with conductive elements or laminated structures. Send your drawing for engineering feedback within 24 hours.
Send us your ring number, flange standard, groove type, pressure class, temperature range and grade preference or finished-part drawing. Our export team replies within 24 hours and confirms grade selection, lead time, packaging and documentation before you place a bulk order.
