Our Expanded PTFE Valve Stem Packing provides absolute reliability, chemical resistance, and the lowest total cost of ownership. It is trusted by industries worldwide for both standard and critical service conditions.
Description
Expanded PTFE (ePTFE) Valve Stem Packing is a versatile, self-forming sealing material made from 100% pure virgin PTFE. Engineered through an expansion process, it creates a fibrillated structure with high tensile strength, enabling it to deform under compression and fill surface imperfections (scratches, pits, etc.). This self-lubricating packing eliminates stem wear, resists chemical attack, and performs reliably across extreme temperatures
| Temperature | -150 °C~260°C |
| Tensile Strength | ≤ 8 Mpa |
| Compressibility | 55% – 80% |
| Creep Relaxation | ≤ 40% |
| Density | 0.7 g/cm3~0.8 g/cm3 |
| PH | 0~14 |
Feature
Chemical Resistance – Inert to most chemicals (pH 0–14); no fillers or binders.
Temperature Range – Stable from -158°C to +260°C.
Self-Lubricating – Reduces friction and prevents stem/shaft wear.
High Pressure Tolerance – Withstands up to 20 MPa (2900 psi).
Clean, Non-Contaminating: It contains no fillers, binders, or contaminants, making it suitable for sensitive applications such as food, pharmaceuticals, and ultra-pure processes.
Advantages
Easy installation—continuous-length form, no cutting or special tools required
Reduced inventory requirements—single packing fits a wide variety of applications
Durability—No age deterioration or degradation over time
Practically eliminates stem wear, reducing the need for costly repairs or replacements
Application
Valve and faucet stems
Rotating shafts and reciprocating plungers
Stuffing boxes and flanges
General-purpose gasket material where exceptional chemical resistance is required
This ePTFE cord can be easily installed without splitting, and its flexibility allows it to fit tightly on small stems or shafts
