Engineered for the Furnace of Industry
Hongwo’s High Temperature PTFE Graphite Gland Packing redefines thermal sealing performance through its proprietary layered construction. Combining expanded PTFE’s flexibility with high-purity graphite’s thermal conductivity, this advanced packing maintains seal integrity where conventional materials carbonize and fail – delivering reliable performance from cryogenic temperatures up to 600°C (1112°F).
Where Infernos Meet Industry
⚡ Power Plant Steam Valves – Withstands 540°C superheated steam (100+ bar)
⚡ Glass Furnace Equipment – Resists molten glass splashes and thermal cycling
⚡ Petrochemical Crackers – Seals pyrolysis gas at 550°C with zero hardening
⚡ Cement Kiln Systems – Endures abrasive dust at 600°C continuous service
⚡ Aerospace Test Rigs – NASA-verified for rocket engine component testing
Thermodynamic Performance Matrix
| Critical Parameter | Test Standard | HT-X500 Grade | Standard Graphite Packing |
|---|---|---|---|
| Maximum Continuous Temp | ASTM D7216 | 600°C | 450°C |
| Thermal Conductivity | ASTM E1461 | 35 W/m·K | 18 W/m·K |
| Compression Set @ 500°C | ISO 1856 | 12% | 38% |
| Oxidation Resistance | ASTM D7542 | <0.5% wt loss | 3.2% wt loss |
| Coefficient of Friction | ASTM D1894 | 0.08 | 0.14 |
Breakthrough Thermal Management Architecture
✧ Triple-Layer Construction
- Outer PTFE Armor – 0.5mm thick expanded PTFE skin resists particle embedment
- Graphite Matrix Core – 98% pure flake graphite aligned for radial heat transfer
- Inner Hybrid Liner – PTFE/graphite composite prevents shaft fretting
✧ Patented Thermal Bridge Technology – Channels heat away from shaft interface
Operational Advantages
✓ Thermal Shock Resistance – Withstands 500°C→25°C quenches without cracking
✓ Self-Adjusting Density – Graphite expansion compensates for gland relaxation
✓ Corrosion Immunity – Passes NACE TM0177 sour service testing
✓ Non-Contaminating – USP Class VI compliant for food/pharma applications
Available in Specialized Formulations:
- HT-X500 Standard – General high temp service
- HT-X600 Nuclear Grade – Boron-doped for neutron absorption
- HT-X550 Abrasion-Resistant – Carbon fiber reinforced for dusty environments
Field Proven Performance:
▶ 18-month continuous service in refinery delayed coker (538°C)
▶ Zero maintenance required on glass furnace stirrers (2,200+ thermal cycles)
▶ 83% reduction in steam valve repacking vs. conventional graphite
(Ask about our Thermal Imaging Inspection Service – we’ll analyze your gland temps remotely!)
