Carbon black
Chemical compound / From Wikipedia, the free encyclopedia
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Carbon black (with subtypes acetylene black, channel black, furnace black, lamp black and thermal black) is a material produced by the incomplete combustion of coal tar, vegetable matter, or petroleum products, including fuel oil, fluid catalytic cracking tar, and ethylene cracking in a limited supply of air. Carbon black is a form of paracrystalline carbon that has a high surface-area-to-volume ratio, albeit lower than that of activated carbon. It is dissimilar to soot in its much higher surface-area-to-volume ratio and significantly lower (negligible and non-bioavailable) polycyclic aromatic hydrocarbon (PAH) content. However, carbon black can be used as a model compound for diesel soot to better understand how diesel soot behaves under various reaction conditions as carbon black and diesel soot have some similar properties such as particle sizes, densities, and copolymer adsorption abilities that contribute to them having similar behaviours under various reactions such as oxidation experiments.[2][3][better source needed] Carbon black is used as a colorant and reinforcing filler in tires and other rubber products; pigment and wear protection additive in plastics, paints, and ink pigment.[4] It is used in the EU as a food colorant when produced from vegetable matter (E153).
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3D model (JSmol) |
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ECHA InfoCard | 100.014.191 |
EC Number |
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E number | E152 (colours) |
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CompTox Dashboard (EPA) |
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Properties | |
C | |
Molar mass | 12.011 g·mol−1 |
Appearance | Black solid |
Density | 1.8–2.1 g/cm3 (20 °C)[1] |
Practically insoluble[1] | |
Hazards | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
> 15400 mg/kg (oral rat)[1] 3000 mg/kg (dermal, rabbit)[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The current International Agency for Research on Cancer (IARC) evaluation is that, "Carbon black is possibly carcinogenic to humans (Group 2B)".[5] Short-term exposure to high concentrations of carbon black dust may produce discomfort to the upper respiratory tract through mechanical irritation.