高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
简单地说，一般建材(如木材、石膏板其至金属天花)当受到高温或燃烧后都会将火和热蔓延至其它位置。
Simply put, the general building materials (such as wood, gypsum board to the metal ceiling) when subjected to high temperature or combustion will spread the fire and heat to other locations.
重吸热材料，如石材地板，或多层的石膏墙板，结合建筑收集热量然后再慢慢释放。
Heavy heat-absorbing materials, such as stone floor tiles or extra layers of gypsum wallboard, are incorporated into buildings to collect heat and slowly release it.
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