Gypsum powder is a building material processed from gypsum ore, which has outstanding fire resistance properties. Its fire resistance performance is achieved through its chemical and physical properties. Below, the fire resistance performance of gypsum powder is analyzed from multiple aspects.

一、化學特性

1、 Chemical properties

石膏粉主要成分是硫酸鈣，其化學分子式為CaSO4。這種化學物質具有較高的耐高溫性能，當溫度升高時，其分子結構發生變化，會釋放出結晶水汽，吸收大量熱量，使得溫度不易升高。同時，硫酸鈣分解時會釋放出一定量的水蒸氣，在消防過程中形成的水蒸氣能夠撲滅火焰，減少火勢。

The main component of gypsum powder is calcium sulfate, and its chemical formula is CaSO4. This chemical substance has high high-temperature resistance. When the temperature rises, its molecular structure changes, releasing crystalline water vapor and absorbing a large amount of heat, making it difficult for the temperature to rise. At the same time, a certain amount of water vapor is released during the decomposition of calcium sulfate, which can extinguish flames and reduce fire intensity during the firefighting process.

二、物理特性

2、 Physical characteristics

良好的隔熱性能

Good insulation performance

石膏粉中的結晶水具有較好的隔熱性能，它可以將高溫熱源從表層隔離開，使溫度無法向表面傳遞。這樣，能夠在一定程度上保護建筑物不受火勢侵害。

The crystalline water in gypsum powder has good thermal insulation performance, which can isolate high-temperature heat sources from the surface and prevent temperature from being transmitted to the surface. This can to some extent protect buildings from fire damage.

高溫下的強度保持性

Strength retention at high temperatures

在高溫環境下，石膏粉中的結晶水會發生蒸發，形成亞硬質碎片，覆蓋在石膏表面，形成防護層。這個防護層與石膏本身有良好的結合性，保證了石膏體的強度。這種特性使石膏粉在消防過程中，不會因為表面燃燒而失去結構強度。

In a high-temperature environment, the crystalline water in gypsum powder will evaporate, forming sub hard fragments that cover the surface of gypsum and form a protective layer. This protective layer has good bonding with the gypsum itself, ensuring the strength of the gypsum body. This characteristic ensures that gypsum powder will not lose its structural strength due to surface combustion during the firefighting process.

不易燃

Non flammable

石膏粉本身不易燃燒，即使火焰直接照射，其燃燒能力也非常有限。這個特性可以在一定程度上保護建筑物，避免建筑物快速失火。

Gypsum powder itself is not easy to burn, and even if the flame is directly irradiated, its combustion ability is very limited. This feature can protect buildings to a certain extent and avoid rapid fire.

低熱導率

Low thermal conductivity

石膏粉的熱導率很低，在阻擋熱流方面具有一定的效果。這樣可以縮小火勢的擴散范圍，減小火勢的威脅。

The thermal conductivity of gypsum powder is very low, and it has a certain effect in blocking heat flow. This can narrow the spread range of the fire and reduce the threat of the fire.

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