Examples of such gases are cyanogen, phosgene and hydrocyanic acid. Class B poisons, though less toxic, are presumed to present a serious threat to health during transportation. Pictographs widely-used pictorial representations of the hazards presented by chemicals. PPB Parts Per Billion. PPM Parts Per Million.
Pyrophoric materials ignite spontaneously in air.
A Reproductive Toxin , such as vinyl chloride or PCBs, is a chemical which may cause birth defects or sterility. A Sensitizer is a chemical which may lead to the development of allergic reactions after repeated exposure. These values, which may differ from country to country, are often backed up by regulation and therefore may be legally enforceable. Systemic poisons have an effect which is remote from the site of entry into the body. TCSA Toxic Substances Control Act.