Precision-Cut Graphite Gasket Material with Enhanced Thermal Stability for Deep-Cryogenic Vacuum Applications in Chemical & Petrochemical Processing Industries
Price:
2.2USD PER KG
MOQ:
500kg
Delivery Time:
20 days
Brand:
CLINGSEAL
Product Description
Precision-Cut Graphite Gasket Material
Enhanced Thermal Stability for Deep-Cryogenic Vacuum Applications in Chemical & Petrochemical Processing Industries
Products Description
Product Overview
Our precision-cut graphite gasket material is produced from high-purity natural graphite flakes through a refined dual-stage process involving chemical intercalation and high-temperature thermal exfoliation. This advanced manufacturing yields flexible graphite products including expanded graphite sheets, foil, tape, and strips, specifically formulated to satisfy the extreme sealing requirements of deep-cryogenic vacuum systems, chemical processing equipment, and petrochemical pipeline valves.
The thermal exfoliation process generates a unique worm-like graphite microstructure with an ultralow bulk density of approximately 3 kg/m³. Without adding any binders or fillers, these structures are compressed into rolls or sheets to achieve a carbon purity of over 99.8%, delivering exceptional sealing performance, low outgassing, and long-term dimensional stability even in harsh chemical and ultra-high vacuum environments.
Critical Performance Features for Chemical & Petrochemical Applications
Chemical Resistance
- Excellent resistance to corrosive media including acids, alkalis, organic solvents, and hydrocarbons commonly found in chemical reactors and petrochemical pipelines.
- Chemically inert structure minimizes contamination risk, making it suitable for high-purity processing and vacuum isolation systems.
- Ultra-low sulfur and chloride content ensures compatibility with sensitive alloys and prevents stress corrosion cracking.
Thermal Stability
- Outstanding operating temperature range: -200°C to 600°C, maintaining stable performance in deep-cryogenic conditions and high-temperature thermal cycling.
- Low thermal expansion coefficient reduces dimensional distortion under rapid temperature fluctuations.
- Stable material structure under vacuum, with minimal outgassing for long-term high-vacuum reliability.
Sealing Performance & Mechanical Stability
- High compressibility and resilient structure ensure tight sealing even on imperfect flange surfaces.
- Impermeable graphite matrix prevents leakage of gases, liquids, and volatile media in vacuum and pressure systems.
- Self-lubricating characteristics reduce friction and wear in dynamic valve components such as stems and seats.
Customizable Specifications
We support full customization to match equipment requirements in chemical and petrochemical facilities, with strict control over dimensional and material tolerances.
Basic Form & Size
- Rolls: Width 1000mm / 1500mm; Length 30m / 50m / 80m
- Sheets: 1000mm × 1500mm
- Thickness: 0.15mm (precision seals) to 5mm (heavy-duty valves)
- Density: 0.8–1.25 g/cm³, adjustable to optimize compressibility and pressure resistance
Precision Tolerances
| Item | Tolerance Range |
|---|---|
| Thickness Tolerance | -0.04mm ~ +0.04mm |
| Dimension Tolerance | Customizable per gasket drawing |
| Density Tolerance | -0.06 g/cm³ ~ +0.06 g/cm³ |
Material Grade & Mechanical Performance
Our graphite gasket materials are graded in accordance with JB/T 53392-1999 and divided into Qualified, Top Grade, and Superior Grade to meet different engineering and project standards.
| Mechanical Data | Qualified Product | Top Grade | Superior Grade |
|---|---|---|---|
| Density Tolerance (g/cm³)
|
±0.10
|
±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 at Ignition
|
≤1.0
|
≤0.5
|
≤0.5
|
| Sulfur Content (ppm) | ≤1500 | ≤1000 | ≤600 |
| Chloride Content (ppm) | ≤100 | ≤50 | ≤20 |
Core Material Indicators
| Item | Standard Value |
|---|---|
| Carbon Concentration | 99% |
| Sulfur Concentration | ＜1000 ppm |
| Chlorine Concentration | ＜45 ppm |
| Tensile Strength | 4.5 MPa |
| Compressibility | ＞40% |
| Recovery | ＞10% |
| Operating Temperature | -200°C ~ 600°C |
| Operating Pressure | Up to 20 MPa |
Application Highlights in Chemical & Petrochemical Industries
Valve Stem Sealing
- Provides reliable dynamic sealing for gate valves, globe valves, butterfly valves, and control valves.
- Metal-reinforced composite versions available for high-pressure API 6D applications.
- Compensates for stem wear and pressure fluctuations while maintaining vacuum integrity.
Flange Gaskets
- Precision laser-cut to match ASME B16.5 and custom flange dimensions.
- Suitable for pipeline connections, reactor closures, and vacuum chamber flanges.
- Corrugated or reinforced structures improve sealing on uneven or aged mating surfaces.
Valve Body & Vacuum Chamber Seals
- Integrated into valve housings for leak prevention in oil refining, chemical synthesis, and low-temperature processing.
- Ideal for deep-cryogenic vacuum systems, high-purity gas delivery, and petrochemical processing units.
Compliance & Quality Testing
- Meets API 607 fire safety requirements for hydrocarbon processing valves.
- Compliant with ASME BPVC Section VIII for pressure vessel sealing systems.
- Tested in accordance with:
- ASTM F137 – gas leakage performance
- ASTM F38 – compression stress relaxation
- NACE TM0177 – chemical compatibility and corrosion resistance
- Graded according to JB/T 53392-1993 for industrial graphite sealing materials.
Why Choose Our Precision-Cut Graphite Gaskets?
- Long Service Life: Stable performance reduces maintenance frequency, with reliable operation exceeding 15 years in continuous service.
- Cost Efficiency: Minimizes unplanned downtime, leakage losses, and replacement costs.
- Custom Engineering: Supports laser cutting for complex geometries, PTFE coating, and metal reinforcement.
- Technical Support: Provides FEA (finite element analysis) for optimized sealing design in critical valves and vacuum equipment.
- Flexible Procurement: Primarily serves factory and enterprise procurement in chemical and petrochemical industries; individual orders are also accepted with freight borne by the buyer. All shipments are dispatched exclusively from China.
Engineered for ultra-reliable, leak-tight performance in deep-cryogenic, high-vacuum, and harsh chemical environments
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Anqing Cling-Seal Manufactory Co., Ltd.
Location
Economic development zone, AnQing, Anhui, China
Contact Person
Jerry