asphalt
close Chinese name: asphalt English name: Bitumen AsphaltSource: coal and petroleum asphalt, main components: asphaltene and resin content: 99.48%. Appearance and properties: the asphalt at normal temperature is semi-solid or liquid, and the color ranges from dark brown to black. Boiling point (℃):<470 Relative density (water=1): 1.15-1.25 Flash point (℃): 204.4 Ignition temperature (℃): 485 Lower explosive limit% (V/V): 30 (g/cubic centimeter) Solubility: It is a hydrophobic material, impervious to water, and almost insoluble in water, acetone, ether, dilute ethanol, and soluble in carbon disulfide, carbon tetrachloride, and sodium hydroxide. Health hazard: medium toxicity. Asphalt and its smoke are irritant to skin and mucosa, and have phototoxic and carcinogenic effects. The toxicity of three major asphalts in China: coal tar pitch>shale pitch>petroleum pitch, and the former two are carcinogenic. The main skin damage of asphalt is: phototoxic dermatitis, which is limited to exposed parts such as face and neck; Melanosis, the skin lesions are usually symmetrically distributed at the exposed parts, in sheet shape, brown dark brown brown black; Occupational acne; Verrucous vegetations and thermal burns caused by accidents. In addition, there are general symptoms such as dizziness, head distension, headache, chest tightness, fatigue, nausea, loss of appetite, and irritation symptoms of eyes, nose, and pharynx. Application: In civil engineering, asphalt is a widely used waterproof material and anti-corrosion material, mainly used for roof, ground, underground structure waterproof, wood, steel anti-corrosion. Asphalt is also a widely used pavement structural cementing material in road engineering. It can be used to build asphalt pavement with different structures after matching with mineral materials of different compositions in proportion. Environmental hazard: It is harmful to the environment and may cause pollution to the atmosphere. Explosion hazard: This product is flammable and irritant. Hazard characteristics: flammable in case of open fire and high heat. It emits toxic and irritating smoke when burning. Removal: If the clothes are accidentally stained with asphalt, they can be cleaned with sodium hydroxide. Conductivity: insulator (at normal temperature). CAS No.: 8052-42-4EINECS No.: 232-490-9