Peroxidizable materials can form peroxides in storage, generally when in contact with the air. These peroxides present their most serious risk when the peroxide-contaminated material is heated or distilled, but they may also be sensitive to mechanical shock. The quantity of peroxides in a sample may be determined using a simple peroxide test strip. Photoallergic contact dermatitis is a skin condition brought on by exposure to light following skin contact with certain types of chemicals, such as sulphonamides. PPM parts per million.
Pyrophoric materials ignite spontaneously in air.
Since a wide variety of chemicals will burn if heated sufficiently, it is usual to define a pyrophoric material as one which will ignite spontaneously at temperatures below about 45 C. R A reproductive toxin , such as vinyl chloride or PCBs, is a chemical which may cause birth defects or sterility. These values, which may differ from country to country, are often backed up by regulation and therefore may be legally enforceable. T A teratogen is a chemical which may cause genetic mutations or malformations in the developing foetus. These values, which may differ from country to country, are often backed up by regulation and therefore may be legally enforceable. O rganic C ompounds.