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Non-asbestos gasket is a sealing material made by adding special adhesives and a little packing to it, then roll and sulfureted. It is a replacement of asbestos gasket. Non-asbestos gasket has better strength, elasticity and supper strong anti-penetrate performance. And it is product with environment protection material.
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The DH-G-NS Asbestos-Free Gasket is a high-performance sealing component made via advanced wet-laid papermaking, designed to replace asbestos gaskets. Composed of non-asbestos mineral fibers (basalt/ceramic) and eco-friendly epoxy binders, it meets RoHS, REACH, and ISO 14001 standards. Available in standard sizes (1200×1800mm, 1500×2000mm) and custom shapes for industrial flanges.
Temperature Resistance: Intermittent 350℃ (CM-2600 grade), continuous 200℃ (CM-5000 grade); stable after 500 thermal cycles (-40℃ to 200℃).
Pressure Capacity: Up to 10MPa (static) and 6MPa (low-dynamic), outperforming entry-level non-asbestos gaskets.
Media Compatibility: Seals oil, fuel, coolant, and compressed air; volume swell <3% (150℃ engine oil, ASTM D471-16).
Mechanical Performance: Compression rebound ≥ 45%, creep relaxation ≤ 12% (1000h), tensile strength 8MPa.
Eco-Friendly: 100% asbestos-free (ISO 22262-1:2017) with zero VOC emissions.
Automotive: Diesel engine cylinder heads, transmission valve plates, hydraulic pump seals.
Heavy Machinery: Gearbox flanges, hydraulic connections in construction equipment.
Energy: Compressor gaskets (natural gas, refrigeration), LNG auxiliary systems.
Manufacturing: Chemical reactor manholes, heat exchanger joints (HG20607-97).
Flange roughness > Ra0.8μm (ISO 3601-3:2022), fluid contamination > NAS 9 grade, or improper installation. Test oil cleanliness every 500h; polish flanges to Ra0.4-Ra0.8μm.
Intermittent 350℃: CM-2600 (ceramic-reinforced).
Continuous 200-250℃: CM-2408 (heat-resistant binder).
< -20℃: Polyurethane-blended variants.
18 months (200℃, 5MPa, mineral oil) – 30% longer than asbestos gaskets. Replace if compression set >15%.
Main technical performance
Item | STD | Unit | Numeric valuts |
Density | _ | g/cm³ | 1.7¯ 1.9 |
Tensile strength | ASTM F152 | N/mm² | ≥10 |
Compressiblity | ASTM F36J | % | 12 ± 5 |
Recovery | ASTM F36J | ℃ | ≥50 |
Relaxation ASTM F38 | 22 Hours 100℃ | % | ≤35 |
ASTM3 oil 150℃/5H | Thickening | % | ≤10 |
Weight thickening | % | ≤10 | |
ASTM Fuel oil B 23℃ /5H | Thickening | % | ≤10 |
Weight thickening | % | ≤10 | |
water/Antifreeze 1:1 100℃/5H | Thickening | % | ≤10 |
Weight thickening | % | ≤10 | |
Working temperature | short time/Continuous | ℃ | 450/-50~250 |
Working compressure | MAX | Mpa | ≤8 |
