The fire resistance time of the cold room board depends on its fire resistance level. Taking the polyurethane cold room board as an example, its fire resistance level is generally Class B.
Fire resistance level and fire resistance time B1 fireproof polyurethane cold storage board: The fire resistance time is longer, usually more than 10 minutes. B2 fireproof polyurethane cold storage board: The fire resistance time is shorter, generally around 5 minutes. B3 fireproof polyurethane cold storage board: The fire resistance time is the shortest, usually around 2 minutes.
Fire resistance level classification standard B1 level: Oxygen index ≥30, belonging to flame retardant materials. B2 level: Oxygen index ≥26, belonging to combustible materials. B3 level: Oxygen index ≥26, belonging to flammable materials.
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