Kaxite Sealing manufactures graphite PTFE packing by braiding expanded PTFE filaments impregnated with high-purity flexible graphite. The PTFE matrix delivers full pH 0–14 chemical inertness and non-contaminating purity; the graphite matrix adds thermal conductivity, conformability and compression recovery — the combination that keeps pumps, valves and agitators sealed at high temperature and continuous PV load. Supplied in square braid, interlocked braid and die-formed rings, in cross-sections 6–16 mm and spool lengths 25 or 50 ft. Procurement teams choose us for factory-direct bulk pricing, documented traceability and 7–15 day lead times.
Pure PTFE packing is chemically inert but thermally slow and low on recovery. Braiding it with graphite raises thermal conductivity to drain frictional heat off the shaft, cuts compression set and improves conformability — three things that keep a gland sealed at high PV.
Graphite packing handles heat but not aggressive chemicals. Impregnating the braid with PTFE filament bridges that gap: the surface that touches the media is chemically inert, while the graphite provides the structural recovery that keeps the ring tight under cycling load.
Expanded PTFE filament production, graphite impregnation, braiding and die-forming all run inside our Ningbo plant. No trading layer, so your graphite PTFE packing price stays stable even on repeat bulk orders.
Expanded PTFE filaments braided with high-purity flexible graphite. Available in square braid, interlocked braid and die-formed rings, spool or pre-cut lengths. The interlocked braids (KX-GPTFE-02 and -04) are specified for high-speed and high-pressure rotary service because their construction resists unravelling under centrifugal force. Die-formed rings (KX-GPTFE-DR) are supplied as pre-sized sets for API 682 pump sealing and split-ring gland upgrades.
| Style Code | Cross-Section (in) | Cross-Section (mm) | Spool Length | Braid Pattern | Typical Application |
|---|---|---|---|---|---|
| KX-GPTFE-01 | 1/4" × 1/4" | 6 × 6 mm | 50 ft / 15.2 m | Square Braid | General service pumps and valves |
| KX-GPTFE-02 | 3/8" × 3/8" | 10 × 10 mm | 50 ft / 15.2 m | Interlocked Braid | Aggressive chemicals, high load |
| KX-GPTFE-03 | 1/2" × 1/2" | 13 × 13 mm | 25 ft / 7.6 m | Square Braid | Large diameter stirrers and mixers |
| KX-GPTFE-04 | 5/8" × 5/8" | 16 × 16 mm | 25 ft / 7.6 m | Interlocked Braid | Heavy-duty agitators, severe service |
| KX-GPTFE-DR | Various | Various | Pre-formed rings | Die-Formed Rings | Precision sets for API 682 pumps |
| Performance Characteristic | Test Standard | Kaxite Result | Industry Benchmark |
|---|---|---|---|
| Compression Recovery | ASTM F36 | > 85 % | Typical: 70 – 75 % |
| Leakage Rate (ROTA) | API 682 / ISO 21049 | < 100 ppmv | Meets and exceeds emission standards |
| Specific Gravity | ASTM D792 | 1.9 – 2.1 | Balance of density and conformability |
| Chemical Resistance | ASTM D543 | No degradation in 95 % of listed chemicals | Widest possible compatibility |
| Shaft Wear | Modified ASTM G137 | Minimal to negligible | Excellent shaft protection |
Pumps and valves handling sulfuric acid, caustic soda, hydrocarbons and chlorinated solvents. Emission control capability meets environmental standards.
Reactors, fermenters and product transfer pumps requiring non-contaminating and FDA-compliant materials. Smooth PTFE surface resists bacterial growth.
Boiler feed pumps, cooling water circulation pumps and auxiliary services, especially where reliability under thermal cycling is essential.
Resists chlorine dioxide, hypochlorite, black liquor and white liquor in mixers, agitators and pumps. Pairs well with our PTFE packing for lower-temperature services.
Chemical dosing pumps, flocculant mixers and aerator shafts. Long service despite varied chemistry and particulates.
Agitators, autoclaves and dyeing equipment. Often combined with PTFE gaskets in the same flange lineup.
Tell us the cross-section, braid style (square, interlocked or die-formed), spool length or ring set, media, operating temperature and shaft speed. Our technical team reviews the PV value before confirming grade selection.
MOQ negotiable. Free short sample lengths of standard cross-sections for installation trial and material evaluation.
7–15 days for standard spools and pre-cut rings; longer for custom cross-sections or custom graphite-to-PTFE ratios.
FOB Ningbo / Shanghai, CIF and DDP available. T/T and L/C payment terms confirmed at quotation.
Inspection report with every shipment. FDA 21 CFR 177.1550, RoHS and REACH declarations with full resin-lot traceability.
Send us your cross-section, braid style, spool length or ring set, media, temperature and shaft speed. Our export team replies within 24 hours and confirms grade selection, lead time, packaging and documentation before you place a bulk order.
