ASPHALTUM , 0.99 , 8052-42-4
PRODUCT Properties
| Melting point: | 54-173 °C |
| Boiling point: | >371 °C |
| Density | 1.15~1.25 |
| Flash point: | 400°F |
| form | A liquid |
| color | Black or dark-brown mass |
| Dielectric constant | 3.5（Ambient） |
Description and Uses
Asphalt fumes are flammable when hot andmay contain hydrogen sulfide and human carcinogen, suchas benzo(a)pyrene and dibenz(a,h)anthracene. Fumes generated during the production or application of asphalt (a darkbrown to black cement-like substance manufactured by thevacuum distillation of crude petroleum oil). Molecularweight= variable 1000°2600; Boiling point= .300℃;Freezing/Melting point= 55°175℃; Flash point#10°225℃ (as a general rule, the more liquid the type ofasphalt, the lower the flashpoint; cutback ,10℃; typicalasphalt 225℃); Autoignition 5 .400℃. HazardIdentification (based on NFPA-704 M Rating System) (typical asphalt): Health 0, Flammability 1, Reactivity 0.However, asphalt cutback has a flammability rating of 3.Insoluble in water. Hazard Identification (based on NFPA-704 M Rating System): roofer’s flux and straight run residue: Health 0, Flammability 1, Reactivity 0.Asphalt fumes have been defined by NIOSH as the nimboseeffusion of small, solid particles created by condensationfrom the vapor state after volatilization of asphalt. In addition to particles, a cloud of fume may contain materials stillin the vapor state. The major constituent groups of asphaltare asphaltenes, resins, and oils made up of saturated andunsaturated hydrocarbons. The asphaltenes have molecularweights in the range of 1000°2600, those of the resins fallin the range of 370°500, and those of the oils is in the rangeof 290°630. Asphalt has often been confused with tarbecause the two are similar in appearance and have sometimes been used interchangeably as construction materials.Tars are, however, produced by destructive distillation ofcoal, oil or wood, whereas asphalt is a residue from fractional distillation or crude oil. The amounts of benzo(a)pyrene found in fumes collected from two different plantsthat prepared hot mix asphalt ranged from 3 to 22 ng/m3;this is approximately 0.03% of the amount in coke ovenemissions and 0.01% of that emitted from coal-burninghome furnaces.
Acid, alkali, and waterproof coatings; black varnishes, lacquers, baking enamels, and japans; wire-insulation compounds; linoleum and floor tile; paving; insulation; diluent in low-grade rubber compounds; possible source of gasoline, fuel oil, and metallurgical coke.
Safety
| RIDADR | 1999 |
| OEL | Ceiling: 5 mg/m3 [15-minute] , Appendix C |
| HazardClass | 3 |
| PackingGroup | III |
