Professional Introduction to Graphite-Filled PTFE Gaskets
Product Overview
Graphite-Filled PTFE Gaskets are composite sealing materials manufactured by uniformly blending high-purity graphite particles into a PTFE (polytetrafluoroethylene) base. This product perfectly combines the excellent chemical inertness of PTFE with the outstanding thermal conductivity of graphite, making it an ideal choice for solving sealing challenges in high-temperature and highly corrosive operating conditions.
Core Characteristics and Advantages
1. Exceptional Chemical Resistance:
Maintains the inherent chemical inertness of PTFE, resistant to strong acids and alkalis (e.g., concentrated sulfuric acid, hydrochloric acid)
Non-stick properties prevent media adhesion
Compliant with FDA standards, suitable for food and pharmaceutical industries
2. Enhanced Thermal Performance:
Thermal conductivity of 0.25-0.45 W/(m·K), 3-5 times that of pure PTFE
Operating temperature: -200°C to 260°C (short-term 300°C)
Significantly improves heat transfer, preventing local overheating
3. Optimized Mechanical Properties:
Compressive strength increased to 18-25 MPa
Creep rate reduced by 40-50%
Coefficient of friction: 0.05-0.12 (good self-lubricating properties)
Product Series
Multiple specifications are offered based on application needs:
Standard Type (GT-10):For general chemical sealing
Reinforced Type (GT-20): Fiberglass mesh reinforced, higher pressure resistance
Wear-Resistant Type (GT-30): Contains metal wire, extends service life
Conductive Type (GT-40): Anti-static design
Typical Applications
Petrochemical Equipment: Reactor, heat exchanger flange sealing
Energy Systems: High-temperature steam pipeline connections
Pharmaceutical Machinery: Clean pipeline sealing
Food Processing: Corrosive media transport systems
Quality Assurance
Raw material purity ≥ 99.9%
Uniform graphite dispersion (particle size 5-20 µm)
100% thickness inspection (tolerance ±0.05 mm)
Certified to international standards such as API and ASME
Installation Guide
1. Clean flange surfaces (recommended Ra 1.6-3.2 µm)
2. Align during installation to avoid eccentric loading
3. Preload force: 15-20 MPa
4. Tighten bolts uniformly and symmetrically
5. Use stepwise temperature increase during initial heating
Precautions
Avoid contact with molten alkali metals
Special treatment required for strongly oxidizing media
Check thickness before reuse
Use with caution above 260°C
Graphite-Filled PTFE Gaskets, with their unique combination of properties, have become a standard sealing solution in fields such as chemical processing and energy. Compared to traditional PTFE gaskets, their service life can be extended by 2-3 times. They are particularly suitable for demanding conditions requiring both chemical inertness and improved thermal conductivity. We provide comprehensive services from standard parts to customized products.
Basic Specification Parameters
| Item |
Parameter Specification |
Test Standard |
Remarks |
| Material Composition |
PTFE + Graphite (15-25%) |
ASTM D4894 |
Uniform graphite dispersion |
| Color |
Gray-Black |
- |
Graphite content determines shade |
| Standard Thickness |
0.5-6 mm |
ISO 3302 |
Tolerance ±0.05 mm |
| Density |
1.8-2.2 g/cm³ |
ISO 1183 |
Graphite content affects density |
Physical Performance Parameters
| Performance Indicator |
Performance Indicator |
Reinforced Type Value |
Test Method |
| Tensile Strength (MPa) |
12-18 |
12-18 |
ASTM D638 |
| Compression (%) |
20-30 |
15-25 |
ASTM F36 |
| Thermal Conductivity (W/m·K) |
0.25-0.35 |
0.35-0.45 |
ASTM E1461 |
| Coefficient of Friction |
0.08-0.12 |
0.05-0.10 |
ASTM D1894 |
Product Series Comparison
| Model |
Graphite Content |
Reinforcing Material |
Main Features |
| GT-10 |
15% |
None |
General Purpose |
| GT-20 |
20% |
Fiberglass Mesh |
High-Pressure Resistant |
| GT-30 |
25% |
Stainless Steel Wire |
Ultra-Wear Resistant |
| GT-40 |
18% |
Carbon Fiber |
Conductive |
Certification Standards
| Certification System |
Certification System |
Certification System |
| FDA |
21CFR177.1550 |
Food Grade Migration Limits |
| API |
6A |
High-Pressure Sealing Performance |
| ISO |
15848-1 |
Cycle Test > 5000 cycles | |
| ASME |
B16.20 |
Flange Compatibility |
