High Quality PTFE Packing Solutions for OEM and Bulk Orders

PTFE braided packing is constructed from twisted or braided PTFE filaments, creating a dense structure for dynamic sealing in pumps and valves with rotary or reciprocating motion. It handles higher shaft speeds and offers better extrusion resistance. ePTFE cord packing is made from expanded PTFE — a softer, highly conformable material used for static sealing, gasketing and low-speed applications where the ability to fill irregular gaps is paramount. The choice depends on motion, pressure and required conformability.

Yes, with attention to temperature and concentration. Pure PTFE has excellent resistance to oxidizing agents. However, in packing form, performance can be influenced by braid construction and any added lubricants. For hot, concentrated oxidizers like 98% nitric acid or wet chlorine gas, we recommend our 100% virgin PTFE grade and advise consulting our engineering team for specific service conditions.

Ensure the shaft and stuffing box are clean, smooth and undamaged. Cut packing rings on a clean, angled mandrel and stagger joints by 90 degrees. Install rings one at a time, seating each firmly with a tamping tool. Initial gland tightening should compress the packing just enough to prevent significant leakage — usually hand-tight plus ¼ to ½ turn. Allow a brief run-in period with minimal acceptable leakage to lubricate and seat the packing, then tighten incrementally to the desired weep rate. Avoid over-tightening; PTFE has low thermal conductivity and can generate excessive heat.

PTFE is not suitable for molten or gaseous alkali metals (sodium, potassium) at high temperature, as they attack the fluorine-carbon bond. PTFE also has a known tendency to cold-flow (creep) under sustained high mechanical load, which can lead to extrusion or loss of sealing force in static applications. For very high-pressure dynamic sealing, a composite packing or a different seal type might be more appropriate. Consult our engineering team for exotic chemistries at elevated temperature.

Yes. We supply specific grades manufactured from FDA-listed raw materials (21 CFR 177.1550) following GMP guidelines. Our pure white virgin PTFE braided packing and specific ePTFE cords are designed for direct and incidental contact in food, pharmaceutical and beverage processing. Material Declarations and Certificates of Compliance are available on request to support your validation processes.

Selection requires shaft or stem diameter, stuffing box bore, and depth (to calculate number of rings). The packing cross-section is typically 1/8 inch (3 mm) less than the radial clearance between shaft and box bore. For high-speed shafts above 5 m/s, a smaller cross-section (4 or 5 mm) helps heat dissipation. For reciprocating rods or abrasive media, a braided style is preferred. For static flanges or low-speed valves, ePTFE cord is an excellent choice. Our team can assist with the calculation and recommend the optimal style based on your fluid, pressure, temperature and speed.

Yes. We supply braided packing either on spools for cutting on site or as pre-formed rings cut to your exact shaft diameter and stuffing box cross-section. Die-formed ring sets are available for API 682 pumps and split-ring gland upgrades. Send your shaft diameter, box bore and depth, and we will confirm ring dimensions and number of rings per set.

Store on the original spool in a cool, dry place away from direct sunlight and heat. Keep sealed until use to prevent contamination from dust or oils, especially for virgin and food-grade grades. Under these conditions, shelf life is effectively unlimited — PTFE does not degrade over time.