Products Description
Engineered using natural graphite flakes via a proprietary chemical intercalation and thermal expansion process, high - temperature graphite gasket materials (including flexible sheets, foil, paper, tape, and strips) are transformed into exfoliated worm - like structures with a bulk density of 0.003g/cc. These structures are compression - formed into binder - free rolls or sheets, achieving purity levels exceeding 99.8%. The resulting materials exhibit unique properties critical for boiler applications.
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Extreme Thermal Stability
- Maintains structural integrity from cryogenic (-200°C) to superheated steam (+650°C) conditions in boiler drums and pipelines.
- Low thermal expansion coefficient (≤3ppm/°C) prevents gasket embrittlement during thermal cycling.
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Pressure & Corrosion Resistance
- Withstands operating pressures up to 100 bar in high - pressure boilers while maintaining 95% compression recovery.
- Resists chemical attack from boiler water treatment chemicals (amines, phosphates) and acidic flue gases.
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Mechanical Durability
- Compressive strength of 55 MPa resists deformation in boiler flange connections.
- Self - lubricating properties reduce friction in moving parts like safety valve stems.
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Steam Header Seals
- Custom - cut gaskets for ASME B31.1 boiler piping, ensuring leak - free operation in high - velocity steam paths.
- Composite designs with stainless steel reinforcement for critical superheater sections.
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Burner Gaskets
- Directly integrated into combustion chambers to seal against extreme temperatures and pressure differentials.
- Graphite - ceramic hybrid versions available for biomass - fired boilers.
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Manhole & Handhole Seals
- Thick - cut sheets (3 - 5mm) provide reliable seals for boiler access points, compliant with ASME BPVC Section I.
- Sizes:
- Rolls: 1000mm/1500mm width, 30m/50m/80m length.
- Sheets: 1000mm x 1500mm, thicknesses from 0.15mm (valve seats) to 5mm (flange gaskets).
- Density: 0.8–1.25 g/cm³ (adjustable to balance softness for dynamic seals vs rigidity for static joints).
- Special Features:
- Laser - engraved channels for optimized heat dissipation in boiler tube seals.
- PTFE - impregnated variants for enhanced resistance to condensate corrosion.
- Meets EN 12952 (water tube boilers) and ASME BPVC Section VIII standards.
- Tested for creep relaxation (ASTM F38), thermal conductivity (ASTM C518), and flame spread (ASTM E84).
- CE/PED certified for pressure equipment directive compliance.
- Proven Reliability: Over 10 years of service life in continuous operation, reducing maintenance costs by 50%.
- Energy Efficiency: Low thermal conductivity improves boiler efficiency by 2 - 3%.
- Technical Support: On - site gasket installation training and failure analysis provided.
Engineered to deliver leak - tight performance in the most challenging boiler environments.
| Item | Standard Value |
| C concentration | 99% |
| S concentration | <1000ppm |
| chlorine concentration | <45ppm |
| tensile strength | 4.5MPa |
| compressibility | >40% |
| recovery | >10% |
| Temperature | -200ºC-600ºC |
| Pressure | 20MPa |
| Terence of Thickness | -0.04mm~+0.04mm |
| Terence of Dimension | In accordance with your Gasket size |
| Terence of Density | -0.06~g/cm3+0.06gcm3 |
Grades Separate :JB/T53392-1999 | Mechanical Data | Qualified product | Top Grade | Superior Grade |
Density Tolerance
g/cm3 | <0.4 | ±0.10 |
±0.05 |
| ≥0.4 | ±0.07 |
| Tensile Strength MPa | ≥3.2 | ≥4.5 | ≥5.0 |
| Compression Ratio % | 35~55 |
| Rebound Rate % | ≥9 | ≥11 | ≥12 |
| Stress relaxation rate % | ≤10 |
| Ash % | ≤6.0 | ≤3.0 | ≤1.0 |
| Heat loss on ignation % | 450ºC | ≤1.0 | ≤0.5 |
| 600ºC | ≤20 | ≤15 |
Sulphur content | ≤1500ppm | ≤1000ppm | ≤600ppm |
Chloride content | ≤100ppm | ≤50ppm | ≤20ppm |
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