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、化学特性

1、 Chemical properties

石膏粉主要成分是硫酸钙，其化学分子式为CaSO4。这种化学物质具有较高的耐高温性能，当温度升高时，其分子结构发生变化，会释放出结晶水汽，吸收大量热量，使得温度不易升高。同时，硫酸钙分解时会释放出一定量的水蒸气，在消防过程中形成的水蒸气能够扑灭火焰，减少火势。

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

良好的隔热性能

Good insulation performance

石膏粉中的结晶水具有较好的隔热性能，它可以将高温热源从表层隔离开，使温度无法向表面传递。这样，能够在一定程度上保护建筑物不受火势侵害。

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.

高温下的强度保持性

Strength retention at high temperatures

在高温环境下，石膏粉中的结晶水会发生蒸发，形成亚硬质碎片，覆盖在石膏表面，形成防护层。这个防护层与石膏本身有良好的结合性，保证了石膏体的强度。这种特性使石膏粉在消防过程中，不会因为表面燃烧而失去结构强度。

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

石膏粉本身不易燃烧，即使火焰直接照射，其燃烧能力也非常有限。这个特性可以在一定程度上保护建筑物，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.

低热导率

Low thermal conductivity

石膏粉的热导率很低，在阻挡热流方面具有一定的效果。这样可以缩小火势的扩散范围，减小火势的威胁。

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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