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 .
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 .
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。