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Cixi City,Zhejiang,China 315300
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DH-P-PHG PTFE Graphite Gland Packing is braided by graphite-filled PTFE impregnated with a small amount of silicone oil. Graphite-filled particles can effectively improve the creep resistance and high temperature resistance of the packing, thusreducing the leakage path, reducing the loss of lubricant and generating less friction heat. it has good stability to highly corrosive mediums such as acid, alkali and solvent,which can be used for seals of pumps and valves with corrosive mediums. As well as, it is a low-wear packing without damaging the shaft.
| Quantity: | |
|---|---|
Performance | Value |
Maximum Temperature | 240 ℃ |
Maximum Linear Velocity | 10m/s |
PH | 2-12 |
Pump Pressure | 40kg/cm² |
Valve Pressure | 80kg/cm² |
The DH-P-PHG PTFE-Graphite Gland Packing is a high-performance dynamic sealing solution engineered for severe-service pumps and valves. Crafted via 12-strand diamond braiding technology, it combines pure PTFE resin with high-purity flake graphite (65:35 ratio) to merge chemical inertness and thermal conductivity. Compliant with FDA 21 CFR 177.1550 and ISO 15797 standards, it is available in standard cross-sections (4mm-20mm) and custom sizes up to 55mm, packaged in 5m/10m moisture-proof spools with a 36-month shelf life (15-28℃, RH <55%).
Thermal Stability: Continuous operating range of -220℃ to +280℃, intermittent resistance up to 300℃; maintains flexibility after 800 thermal cycles (-196℃ to 260℃).
Pressure Capacity: Withstands 18MPa (reciprocating motion) and 12MPa (rotating motion) – 20% higher than standard PTFE packing.
Friction & Wear: Coefficient of friction ≤ 0.07 (lubricated) and ≤ 0.11 (dry); wear rate < 0.008mm/1000h, reducing shaft abrasion by 40%.
Chemical Resistance: Resists all organic solvents, acids (98% H₂SO₄), alkalis (50% NaOH), and hydrocarbons; no volume swell in 150℃ crude oil (ASTM D471-16).
Thermal Conductivity: 8.5 W/(m·K) – 2.5x higher than pure PTFE, preventing heat buildup in high-speed applications.
Oil & Gas: Centrifugal pumps in crude oil pipelines (250℃, 10MPa), offshore platform valve stems (saltwater-resistant).
Chemical Processing: Agitator shafts in polymer reactors, diaphragm pump seals for fluorine-containing chemicals.
Refining: Hydrotreater pump shafts (280℃, 15MPa), distillation column control valves.
Cryogenics: LNG transfer pump seals (-196℃), liquid nitrogen valve stems.
Pure PTFE suffers from poor thermal dissipation, leading to hot spots above 260℃. The 35% graphite content in DH-P-PHG conducts heat away from the shaft, extending service life by 50% and reducing leakage incidents by 35% in high-temperature applications.
Cold-flow (plastic deformation under pressure) is mitigated by our fiberglass micro-reinforcement (5% by weight, 8μm diameter). For static applications >15MPa, pre-compress the packing at 20MPa for 2 hours before installation; this reduces cold-flow by 70%.
In 25℃ seawater (3MPa, 1800 RPM), service life reaches 24 months – 60% longer than graphite-only packing. Inspect quarterly; replace if leakage exceeds 0.2 ml/min or compression set exceeds 12%.
