1. 钢制防火门如何区分等级？

How to distinguish the grades of steel fire doors?

防火门的等级，核心看它能“扛火”多久：

The level of a fire door depends on how long it can withstand fire:

甲级：耐火 ≥ 1.5 小时（适用于高风险区域，如机房、油库）；

Class A: Fire resistance ≥ 1.5 hours (applicable to high-risk areas such as computer rooms and oil depots);

乙级：耐火 ≥ 1.0 小时（常见于楼梯间、前室）；

Class B: Fire resistance ≥ 1.0 hour (commonly found in stairwells and front rooms);

丙级：耐火 ≥ 0.5 小时（多用于管道井、设备间）。

Class C: Fire resistance ≥ 0.5 hours (mostly used in pipeline wells and equipment rooms).

别小看这几十分钟——在火灾中，每一秒都关乎生死。

Don't underestimate these few dozen minutes - in a fire, every second is a matter of life and death.

2. 不同等级的防火门厚度一样吗？

2. Are the thicknesses of fire doors of different levels the same?

严格来说，厚度不是判定标准，但高等级门往往“更厚实”。因为要塞进更多防火芯材（比如珍珠岩或硅酸铝），才能撑住更长时间的高温考验。不过，真正靠谱的判断依据，还是看有没有权威机构出具的检测报告。

Strictly speaking, thickness is not a criterion for judgment, but high-grade doors are often "thicker". Because more fire-resistant core materials (such as perlite or aluminum silicate) need to be inserted to withstand longer periods of high temperature testing. However, the truly reliable basis for judgment still depends on whether there is a testing report issued by an authoritative institution.

3. 性能检测报告有效期多久？

How long is the validity period of the performance testing report?

国家规定，防火门的型式检验报告有效期为3年。这意味着，三年内若产品没改结构、材料或工艺，这份报告依然有效。但如果您看到一份“过期”报告，哪怕门看起来再结实，也建议谨慎对待——安全，容不得侥幸。

According to national regulations, the validity period of the type inspection report for fire doors is 3 years. This means that if the product's structure, materials, or craftsmanship remain unchanged within three years, this report will still be valid. But if you see an 'expired' report, even if the door looks sturdy, it is recommended to handle it with caution - safety, no room for luck.

4. 为什么防火门会脱胶？

Why do fire doors come loose?

脱胶不只是“掉皮”那么简单。它往往暴露了一个隐患：厂家为了降低成本，用了普通胶水代替耐高温防火胶。真正的防火胶，能在800℃以上依然保持粘结力。一旦用错胶，火灾中门板可能迅速开裂、脱落，防火功能瞬间失效。所以，细节里藏着安全的底线。

Degumming is not just about "peeling off the skin". It often exposes a hidden danger: manufacturers use ordinary glue instead of high-temperature resistant and fire-resistant glue to reduce costs. True fire-resistant adhesive can maintain its bonding strength even at temperatures above 800 ℃. Once the wrong glue is used, the door panel may quickly crack and fall off in a fire, and the fire prevention function will instantly fail. So, there is a safety bottom line hidden in the details.

5. 能用不锈钢铰链吗？

Can stainless steel hinges be used?

可以，但前提是——它得是防火铰链。普通不锈钢铰链虽耐腐蚀，未必耐火。合格的防火铰链（无论是不锈钢材质还是镀锌镀铬处理）都建议通过整门耐火测试，确保在高温下不变形、不脱落。毕竟，再好的门，如果“站不住”，也等于零。

Sure, but the prerequisite is that it must be a fireproof hinge. Although ordinary stainless steel hinges are corrosion-resistant, they may not necessarily be fire-resistant. Qualified fireproof hinges (whether made of stainless steel or galvanized chrome plated) must pass the entire door fire resistance test to ensure that they do not deform or fall off at high temperatures. After all, no matter how good the door is, if it cannot stand, it is equal to zero.

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