Kaxite Sealing manufactures PTFE balls by precision machining and sintering from 100% virgin PTFE and filled compounds. Diameter 1.0–100 mm in four tolerance bands down to ±0.05 mm with sphericity ≤0.025 mm, surface finish Ra ≤0.8 µm. Service temperature -200 to +260 °C, chemical resistance pH 0–14, coefficient of friction 0.05–0.10, self-lubricating and non-stick. Five standard grades: KX-PTFE-V virgin, KX-PTFE-G glass-filled, KX-PTFE-C carbon-graphite filled, KX-PTFE-B bronze-filled and KX-PTFE-SSC stainless steel cored. FDA 21 CFR 177.1550 and USP Class VI compliant. Free samples, bulk wholesale and 7–15 day lead times.
Beyond generic "PTFE is chemical resistant" claims, three properties determine whether a PTFE ball succeeds or fails in a check valve, dosing pump or precision bearing. These are the three we engineer for.
Coefficient of friction 0.05–0.10 — among the lowest of any solid. Balls seat and unseat without galling or sticking, even after long idle periods in aggressive chemistry or dry running.
Valves · Bearings · Oil-freePrecision machining and sintering hold diameter tolerance down to ±0.05 mm and sphericity ≤0.025 mm — critical for reliable seating and consistent flow control in precision valves.
Precision valves · InstrumentsFDA 21 CFR 177.1550 and USP Class VI compliant grades. Chemically inert across pH 0–14 — no leaching, no swelling, no corrosion, no oil carry-over in food, pharma and semiconductor service.
Food · Pharma · Semiconductor
Precision-machined and sintered from 100% virgin PTFE or filled compounds to a flat, crevice-free surface with no layered structure and no separation. Resistant to aging, radiation, oil and high pressure with very low permeability. Available in five standard grades with custom diameters, tolerances and surface finishes to drawing.
Each grade is engineered for a distinct combination of chemical resistance, load-bearing capacity and thermal conductivity. Use this guide to shortlist the right compound before requesting a quotation.
100% pure PTFE. Maximum chemical purity, flexibility and electrical resistance — no fillers, no additives.
High-Purity · FDA15–25% glass microfiber. Improved compressive strength, reduced creep, better wear resistance under mechanical load.
Heavy-Duty Valve Seats15–25% carbon graphite. Enhanced thermal conductivity, lower friction, superior wear in dry running.
Dry Running · High PV40–60% bronze powder. Higher load capacity, excellent thermal conductivity, superior wear resistance.
High-Load BearingsStainless steel core with PTFE shell. High structural integrity and weight while maintaining PTFE surface.
Check Valves · Positive Seating| Diameter Range (mm) | Diameter Tolerance (mm) | Sphericity (mm) | Surface Finish (Ra µm) | Available Grades |
|---|---|---|---|---|
| 1.0 – 5.0 | ±0.05 | ≤0.025 | ≤0.8 | Virgin, Glass-Filled, Carbon-Filled |
| 5.1 – 15.0 | ±0.08 | ≤0.038 | ≤0.8 | Virgin, Glass, Carbon, SS Cored |
| 15.1 – 50.0 | ±0.13 | ≤0.050 | ≤1.6 | Virgin, Glass, Carbon, Bronze, SS Cored |
| 50.1 – 100.0 | ±0.25 | ≤0.075 | ≤1.6 | Virgin, Glass, Carbon, Bronze |
| Above 100.0 | Custom to drawing | Custom to drawing | Custom to drawing | All grades on request |
Six industries where virgin or filled PTFE balls replace metal, elastomer or ceramic balls in valves, pumps, meters and precision bearings.
Bubble-tight seating with lower spring force than metal balls. Self-lubricating, no galling, completely corrosion-proof. Pairs with our PTFE ring gaskets for flange sealing.
Handling aggressive acids, alkalis and solvents. Chemical inertness across pH 0–14 with no swelling or degradation. See our PTFE packing for combined dynamic sealing.
FDA 21 CFR 177.1550 and USP Class VI compliant grades for filling systems, sterile valves and pure-media transfer. Non-stick and easy-clean. Pairs with our pure PTFE gaskets.
Ultra-clean wafer processing, high-purity gas delivery and UPW distribution. Virgin PTFE for zero-contamination service. Pairs with our PTFE tubes for full flow-path purity.
Rotary and reciprocating flow meters, gauges and analytical instruments. Self-lubricating, non-magnetic and dimensionally stable. Pairs with our PTFE flexible tubing in sampling lines.
Low-friction bearing elements in packaging machinery, textile equipment and automotive components where lubrication is undesirable or impossible. Carbon or bronze-filled grades for high PV.
Inherent corrosion resistance — no rusting or chemical degradation. Low friction ensures smooth operation and reduces seat wear. PTFE is softer than metal, providing a more conformable bubble-tight seal against the seat. It also operates quietly, is lighter in weight and requires no external lubrication.
For maximum chemical resistance and purity, choose Virgin (KX-PTFE-V). For high mechanical load or pressure where cold flow is a concern, Glass-Filled (KX-PTFE-G) is recommended. For high-load bearings needing thermal dissipation, Bronze-Filled (KX-PTFE-B) is optimal. For dry or marginally lubricated sliding applications, Carbon-Filled (KX-PTFE-C) provides the best wear life.
Yes, with considerations. PTFE compressive strength is lower than metals. The pressure rating depends on housing design, seat material and PTFE grade. Reinforced grades — glass-filled or bronze-filled — offer significantly higher resistance to compressive creep and perform well in high-pressure systems when properly constrained.
Cold flow is the tendency of PTFE to slowly deform under continuous mechanical load over time. In a ball valve under constant high seat load, the ball may gradually deform. Mitigated by filled grades (glass, carbon or bronze) which dramatically reduce creep, and by proper mechanical design that avoids excessive permanent loading.
Yes. We offer grades manufactured from FDA 21 CFR 177.1550 compliant raw materials for incidental food contact, and USP Class VI compliant grades for biocompatibility. Ideal for sanitary valves, dispensers and process equipment. Certificates of Compliance are available on request.
Yes. We manufacture PTFE balls in non-standard diameters, with unique filler compositions, specific surface treatments, and tolerances tighter than our standard offerings. Complete assembly integration — pre-assembled balls into cages or holders — is also supported. Send your specification for engineering feedback within 24 hours.
Send us your diameter, diameter tolerance, sphericity requirement, surface finish, material grade (virgin, glass-filled, carbon-filled, bronze-filled or stainless steel cored), quantity, operating media, temperature and pressure — or a 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.
