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 Asphalt category 
 Asphalt can be divided into three kinds of coal tar pitch, petroleum bitumen and natural asphalt: 
 Coal tar pitch 
 Coal tar pitch is a byproduct of coke tar distillation residue in the distillation kettle black substance. Refined tar only physical properties are different, there is no obvious boundaries, the general classification is provisions to soften the following points in 26.7 ° C (cube method) for tar, 26.7 ° C above the asphalt. Coal tar pitch containing volatile anthracene, phenanthrene, pyrene, and so on. These substances are toxic, thus the content of these ingredients, the nature of the coal tar pitch. Changes in temperature coal tar pitch, the winter is easy to brittle fracture, the summer is easy to soften. Special odor when heated; heated to 260 ° C after 5 hours, which contains anthracene, phenanthrene, pyrene and other ingredients will evaporate. 
 Petroleum pitch 
 Petroleum bitumen after crude distillation residue. According to the different levels of refining into liquid, semi-solid or solid at room temperature. Petroleum asphalt color black 
 And shiny, with a high temperature susceptibility. Distillation in the production process have to more than 400 ℃, which contains very little volatile components, but may still be hydrocarbon polymer without volatile, these substances are more or less harmful to human health. 
 Natural asphalt 
 Natural asphalt storage in the ground, some of the formation of the seam or surface accumulation in the crust. Asphalt mostly through natural evaporation, oxidation, are generally not contain any toxins. 
 Bituminous material is divided into two major categories of asphalt and tar pitch. The asphalt is divided into natural asphalt and petroleum asphalt, natural bitumen, oil seeping to the surface by long-term exposure and evaporation residues; asphalt products refined processing of oil remaining residue, the appropriate Process . Tar pitch is obtained from processing of coal, wood and other organic dry distillation tar re-processed products. Asphalt works are the vast majority of petroleum asphalt, petroleum asphalt is a mixture of complex hydrocarbons and their non-metallic derivatives. Usually asphalt flash point between 240 ℃ ~ 330 ℃, lighted than the flash point of about 3 ℃ to 6 ℃ degrees, so the construction temperature should be controlled in the flash point below.