理化性质：
Physical and chemical properties

常温下为黑色固体，在一定的 温度下凝固成很脆的具有贝壳状断口的固体，呈玻璃相；没有一定的熔点，在一定的熔点范围内熔化，凝固时没有热效应。沥青组分极为复杂，大多数为三环以上的芳香族烃类，还有含氧、氮和硫等元素的杂环化合物和少量高分子炭素物质。
Soft pitch is a black solid at a certain temperature ,it will be solidified into a brittle solid with shell-like fracture. It will melt in a certain range of melting points ,but it has no definite melting point .Soft pitch has no thermal effect when solidified .

生产工艺：
Production process

高温煤焦油经过精馏后的残留物。
Soft pitch is a kind of residue obtained after distillation of high temperature coal tar.

运输：
Transportation

中温沥青经水冷却后而得固体沥青，卡车或火车散装运输，按交通部危险品运输办法办理。
By cooling soft pitch with water, solid pitch is obtained, which should be transported in bulk by trucks or by cargo train .It is in the category of dangerous product stipulated by the Ministry of Transportation.