防火板的防火等級是指該材料在火災發生時所能承受的高溫和火焰蔓延的能力。防火等級主要取決于材料的防火性能和耐火性能。在國內防火板的防火等級一般采用國家標準進行分類和評定。目前我國常用的防火板等級標準分為B1級、B2級和B3級三個等級。

The fire rating of a fireproof board refers to the ability of the material to withstand high temperatures and flame spread in the event of a fire. The fire rating mainly depends on the fire resistance and fire resistance performance of the material. In China, the fire rating of fire-resistant panels is generally classified and evaluated using national standards. At present, the commonly used fire protection board rating standards in China are divided into three levels: B1, B2, and B3.

B1級防火板是指具有較好耐火性能的防火板，能夠在火災發生時有效地抵抗火焰的蔓延。它通常由纖維素紙、耐火劑和樹脂等原材料組成，具有較高的防火性能和耐火性能。

B1 level fireproof board refers to a fireproof board with good fire resistance performance, which can effectively resist the spread of flames in the event of a fire. It is usually composed of raw materials such as cellulose paper, refractory agents, and resins, and has high fire and fire resistance properties.

B2級防火板是指具有一定耐火性能的防火板，能夠在火災發生時一定程度上抵御火焰的蔓延。它通常由纖維素紙、耐火劑和樹脂等原材料組成，其防火性能和耐火性能略低于B1級防火板。

B2 level fireproof board refers to a fireproof board with certain fire resistance performance, which can resist the spread of flames to a certain extent in the event of a fire. It is usually composed of raw materials such as cellulose paper, refractory agent, and resin, and its fire resistance and fire resistance performance are slightly lower than B1 level fireproof boards.

B3級防火板是指具有一定防火性能的防火板，但其耐火性能相對較差。B3級防火板通常由纖維素紙、耐火劑和樹脂等原材料組成，其防火性能和耐火性能較低。B3級防火板在火災發生時只能有效抑制火勢的蔓延一段時間，無法長時間抵擋明火的燃燒。

B3 level fireproof board refers to a fireproof board with certain fire resistance performance, but its fire resistance performance is relatively poor. B3 grade fireproof board is usually composed of raw materials such as cellulose paper, refractory agent, and resin, and its fire resistance and fire resistance performance are relatively low. B3 level fireproof boards can only effectively suppress the spread of the fire for a period of time in the event of a fire, and cannot withstand the burning of open flames for a long time.

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