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1,2,4-Trimethylbenzene, also known as pseudocumene, is an organic compound with the chemical formula C 6 H 3 (CH 3) 3. Classified as an aromatic hydrocarbon, it is a flammable colorless liquid with a strong odor. It is nearly insoluble in water but soluble in organic solvents. It occurs naturally in coal tar and petroleum (about 3%).
Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents positioned symmetrically around the ring. The other two isomeric trimethylbenzenes are 1,2,4-trimethylbenzene (pseudocumene) and 1,2,3-trimethylbenzene (hemimellitene).
1,2,4-trimethylbenzene asym.-trimethylbenzene: 1,3,5-trimethylbenzene sym.-trimethylbenzene Structural formula: CAS Registry Number: 526-73-8: 95-63-6: 108-67-8 ...
The current PEL for OSHA standards are based on a 5 decibel exchange rate. OSHA's PEL for noise exposure is 90 decibels (dBA) for an 8-hour TWA. Levels of 90-140 dBA are included in the noise dose. [4] PEL can also be expressed as 100 percent “dose” for noise exposure. When the noise exposure increases by 5 dB, the exposure time is cut in ...
It is typically set by competent national authorities and enforced by legislation to protect occupational safety and health. It is an important tool in risk assessment and in the management of activities involving handling of dangerous substances. [1] There are many dangerous substances for which there are no formal occupational exposure limits.
The OSHA definition is part of a legal standard, which is the minimum legal requirement. Users or employers are encouraged to apply proper judgment to avoid taking unnecessary risks, even if the only immediate hazard is "reversible", such as temporary pain, disorientation, nausea, or non-toxic contamination.
There are three trimethylbenzenes, three ethylmetylbenzenes, and two propylbenzene isomers. 1980s American gasoline contained about 3-4% C 3-benzenes. [ 1 ] 1,2,3-trimethylbenzene or Hemellitene
These standards were split into 4 categories: Gasses and Vapors, Toxic Dusts, Fumes, and Mists, Mineral Dusts, and Radiations. [5] In 1970, the US Occupational Health and Safety Act was signed into law, [6] which created the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health ...