The fire rating of insulation materials has four grades, including A, B1, B2 and B3 respectively. The specific contents are as follows:
Grade A
Grade A, which is the top grade of fire rating, is the material with insulation effect without fire point, which refuses to burn (in general, that is the material that cannot be ignited). At present, Grade A fireproof materials mainly have glazed hollow bead, expanded perlite with closed pore, rock wool, mineral wool, glass wool, cement-based or gypsum-based inorganic insulation mortar and inorganic insulation mortar of lightweight wall block self-insulation system series, etc., which are the most common Grade A fireproof materials.
Bosheng rock wool is Grade A1 fireproof insulation material.
Grade B1
Grade B1, which is next only to Grade A, is fire-retardant insulation material determined by the duration of fire resistance of the material, in addition, it differs from the division of material at different parts! Such as the more common EPS/XPS insulation board added with fire retardant through special processing.
Grade B2
Combustible insulation material, mainly EPS expanded polystyrene board and XPS extruded polystyrene board, i.e. general board often said by us. Such material with low fire point will release plenty of harmful gas during the combustion process.
Grade B3
Inflammable insulation material, mainly insulation material with polyphenyl foam as main material. Because such material is inflammable, at present, it has been eliminated as external wall insulation material.
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A?
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B1?
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B2?
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B3?
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