Kaxite Sealing manufactures PTFE balls by precision molding, sintering and machining from virgin PTFE and filled PTFE compounds — glass, carbon-graphite and stainless steel — with FDA 21 CFR 177.1550 compliant grades. Diameter range 0.5–50.8 mm, standard tolerance ±0.1 mm and precision grades to ±0.05 mm. Service temperature -200 to +260 °C, chemical resistance pH 0–14, coefficient of friction 0.05–0.10, dielectric strength 19 kV/mm. Self-lubricating, non-stick and chemically inert — the standard choice for check valves, ball valve seats, dosing pumps, flow meters and electrical insulation. 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 valve, pump or meter. 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.
Precision molding and sintering under controlled pressure keep sphericity and density uniform across every batch — no layered structure, no separation, no crevices. Precision grades to ±0.05 mm.
FDA 21 CFR 177.1550 compliant grades for food, pharmaceutical and semiconductor service. Chemically inert across pH 0–14 — no leaching, no swelling, no corrosion, no oil carry-over.
Precision-machined and molded from 100% virgin PTFE or filled PTFE compounds — glass, carbon-graphite and stainless steel — 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.
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% unfilled PTFE. Maximum chemical purity, best dielectric properties and lowest friction. Standard for chemical processing and semiconductor service.
High-Purity · FDA15–25% glass microspheres. Improved compressive strength, wear resistance and dimensional stability while maintaining good chemical resistance.
Wear Resistance15–25% carbon or graphite. Enhanced thermal conductivity, reduced deformation under load, superior wear in dry running.
Dry Running · High PVStainless steel particles. Greatly increased load-bearing capacity, hardness and thermal conductivity for heavy-duty mechanical service.
Heavy Duty · High Load| Diameter (mm) | Diameter (inches) | Common Applications | Tolerance Grade |
|---|---|---|---|
| 0.5 – 3.0 | 0.020" – 0.118" | Precision instruments, micro check valves, micro-dispensers | ±0.05 mm (precision) |
| 3.0 – 10.0 | 0.118" – 0.394" | Standard ball valves, pump components, gauges | ±0.1 mm (standard) |
| 10.0 – 25.4 | 0.394" – 1.000" | Large industrial valves, chemical processing, bearing assemblies | ±0.1 mm (standard) |
| 25.4 – 50.8 | 1.000" – 2.000" | Heavy-duty processing equipment, large fluid systems | ±0.1 mm (standard) |
| Above 50.8 | Above 2.000" | Special machinery, custom assemblies | Custom to drawing |
Six industries where virgin or filled PTFE balls replace metal, elastomer or ceramic balls in valves, pumps, meters and electrical insulation.
Ball valve seats, check valves, dosing pumps and corrosive fluid conduits. Pairs with our PTFE ring gaskets for flange sealing.
FDA 21 CFR 177.1550 grades for filling systems, sterile valves and pure-media transfer. Non-stick, easy-clean, zero extractables. See our pure PTFE gaskets for hygienic flanges.
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.
Fuel systems, pneumatic controls and hydraulic circuits where wide temperature swings and chemical resistance are mandatory.
Rotary and reciprocating flow meters, gauges and analytical instruments. Self-lubricating and non-magnetic. Pairs with our PTFE flexible tubing in sampling lines.
Dielectric strength 19 kV/mm. Connector accessories, insulating spacers and high-frequency circuit components. Pairs with our PTFE packing in combined insulation assemblies.
Cold flow (creep) under sustained heavy load and lower mechanical strength compared with metal balls. Mitigated by filled grades — glass or carbon — for high-load and abrasive service. Not suitable for extremely high point loads without proper support housing.
Yes, with reinforced grades. Virgin PTFE has cold flow limitations — for high-pressure valve or pump service, use carbon-filled or glass-filled PTFE balls with significantly improved compressive strength. Specific rating depends on ball diameter, housing design and operating temperature.
Choose virgin PTFE for maximum chemical purity, superior dielectric properties or FDA direct-contact compliance. Choose filled PTFE — glass, carbon or stainless steel — when you need improved wear resistance, reduced cold flow, higher compressive strength, better thermal conductivity or increased hardness.
Yes. Virgin PTFE is approved for oxygen service under many industry standards (ASTM G63). It does not support combustion, will not react with liquid or gaseous oxygen, and is chemically inert to strong acids (sulfuric, hydrochloric), strong alkalis, halogens and virtually all organic solvents.
PTFE provides a bubble-tight seal with lower seating force, is self-lubricating (no galling or seizing) and is completely corrosion-proof. Stainless steel offers higher structural strength and less deformation under extreme pressure. For corrosive fluids, ultrapure systems or where lubrication is undesirable, PTFE is superior.
Yes. Beyond standard molded and sintered sizes, we machine balls to non-standard diameters and special geometries with tight tolerances. Special features — through-holes, flats and grooves — can be added. Cleanroom packaging, lot traceability and secondary operations are available.
Send us your diameter, tolerance grade, material grade (virgin, glass-filled, carbon-filled or stainless steel-filled), 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.
