Tailored Thickness Flexible Graphite Gasket with Superior Heat Stability for Deep-Cooling Vacuum Systems in Petroleum & Industrial Processing Facilities
Products Description
Cling‑Seal flexible graphite gaskets with tailored thickness are purpose-built to perform reliably in harsh operating environments, especially deep‑cooling circuits and high‑vacuum systems widely used in petroleum refineries, chemical plants, and general industrial processing facilities. Combining high purity, exceptional thermal stability, and fully customizable dimensions, our products provide long‑lasting, leak‑tight sealing performance under extreme temperature, pressure, and corrosive conditions.
Manufacturing Process
Our graphite material starts with high‑purity natural graphite flakes, which are chemically intercalated then rapidly thermally expanded at 800–1000°C. This process creates worm‑structured expanded graphite with a bulk density of approximately 3 kg/m³. Without binders or chemical additives, the expanded graphite is compacted into rolls or sheets, delivering consistent performance and carbon purity above 99% — ideal for vacuum compatibility and low outgassing.
Product Portfolio
We offer a full range of flexible graphite products to support custom gasket manufacturing and on‑site processing:
- Expanded graphite sheets
- Graphite foil
- Graphite tape
- Graphite strips
- Graphite paper
Standard Specifications
We provide standardized coil and sheet configurations to fit diverse cutting, stamping, and assembly requirements.
| Parameter |
Coil Product |
Sheet Product |
| Width |
1000mm / 1500mm |
1000mm / 1500mm |
| Length |
30m / 50m / 80m |
— |
| Thickness |
0.15–1.0mm |
1.0–5.0mm |
| Density |
0.8–1.25 g/cm³ |
0.8–1.25 g/cm³ |
Note: Custom thickness, sizes, and metal‑reinforced composite structures are available for OEM and project‑specific demands.
Core Physical & Chemical Properties
These performance values ensure stable behavior in deep‑cooling, high‑vacuum, and petroleum processing environments.
| Item |
Standard Value |
| Carbon Concentration |
99% |
| Sulfur Concentration |
<1000 ppm |
| Chlorine Concentration |
<45 ppm |
| Tensile Strength |
4.5 MPa |
| Compressibility |
>40% |
| Recovery Rate |
>10% |
| Operating Temperature |
-200°C ~ 600°C |
| Working Pressure |
Up to 20 MPa |
| Thickness Tolerance |
-0.04mm ~ +0.04mm |
| Dimension Tolerance |
Custom per drawing |
| Density Tolerance |
-0.06 ~ +0.06 g/cm³ |
Grade Classification (JB/T 53392-1999)
Three quality grades to meet different industrial standards, equipment criticality, and project specifications.
| Mechanical Data |
Qualified Product |
Top Grade |
Superior Grade |
| Density Tolerance
<0.4 g/cm³
≥0.4 g/cm³ |
±0.10
±0.07 |
±0.05 |
±0.05 |
| Tensile Strength (MPa) |
≥3.2 |
≥4.5 |
≥5.0 |
| Compression Ratio (%) |
35–55 |
35–55 |
35–55 |
| Rebound Rate (%) |
≥9 |
≥11 |
≥12 |
| Stress Relaxation Rate (%) |
≤10 |
≤10 |
≤10 |
| Ash Content (%) |
≤6.0 |
≤3.0 |
≤1.0 |
| Heat Loss 450°C / 600°C |
≤1.0 / ≤20 |
≤0.5 / ≤15 |
≤0.5 / ≤15 |
| Sulfur Content (ppm) |
≤1500 |
≤1000 |
≤600 |
| Chloride Content (ppm) |
≤100 |
≤50 |
≤20 |
Key Performance Advantages
-
Superior Thermal & Vacuum Stability
Stable performance from deep‑cooling low temperatures to high‑temperature cycling; low outgassing and excellent dimensional stability for high‑vacuum environments.
-
Strong Chemical Compatibility
Resists acids, alkalis, hydrocarbons, and petroleum media; low sulfur and chlorine prevent alloy corrosion in critical processing equipment.
-
Excellent Mechanical Sealing Performance
High compressibility and rebound ensure tight sealing even on imperfect flange surfaces; stable under pressure fluctuations and long‑term service.
-
Customizable Composite Structure
Can be laminated with stainless steel or copper alloy for reinforced gaskets, improving strength for heavy‑duty flange and valve applications.
Typical Applications
- Dynamic sealing: shaft packing, valve stem seals, and pump seals
- Custom flange gaskets for pipelines, pressure vessels, and reactors
- Sealing components for high‑vacuum chambers and deep‑cooling systems
- Thermal barriers and static seals in petroleum and heavy industrial facilities
Cling-Seal Supply & Service Terms
- Primary Customers: Mainly overseas corporate buyers, factory procurement teams, engineering contractors, and OEM industrial clients.
- Shipping Location: All products shipped exclusively from China.
- Individual Buyers: Orders are accepted only if buyers cover the full international freight cost for single‑piece dropshipping. Orders cannot be processed without confirmed freight arrangements.