The Silicon Fiber Gasket should not contain asbestos or other harmful components. It should be oil-resistant, moisture-resistant, and resistant to acid and alkali corrosion. The working temperature of the standard Silicon Fiber Gasket should not be less than 70°C.

For smoke exhaust duct flange gaskets: not less than 250°C/1h for underground stations, and not less than 280°C/1h for ground, elevated stations, and ground buildings. The gasket surface should be non-sticky, easy to cut into shape, have a smooth surface, and uniform thickness. The gasket should be soft, with a minimum bending radius not exceeding 20 times the gasket thickness, and should not crack when bent.

Aging factor 20.9, ash content ≤30%. The product must be a five-layer composite, with a thickness of ≥3.0mm, and the use of coatings is not allowed.

For high-temperature smoke exhaust performance, it should be capable of continuous operation for over 1 hour under 300°C high-temperature smoke conditions.

Combustion performance: the fireproof layer material should meet the non-combustible Class A level of GB/T8624 “Classification method for combustion performance of building materials”.

The Grade One silicon fiber gasket product must have physical property test reports and chemical composition analysis reports from national professional inspection institutions.