当电缆遭到燃烧时，能够吸收大量的热量，并形成碳化层，隔绝气层、保护绝缘层免受燃烧，使火灾的损失不致于进一步扩大化。
When the cable was burning , a lot of heat can be absorbed , and form a carbon layer to isolate the gas and protect the insulation layer from burning , so that the loss will be cut .
形成隔绝