In industrial chemistry, a stabilizer is a chemical that is used to prevent degradation. Heat and light stabilizers are added to plastics and elastomers because they ensure safe processing and protect products against aging and weathering. The trend is towards fluid systems, pellets, and increased use of masterbatches. There are monofunctional, bifunctional, and polyfunctional stabilizers. In economic terms the most important product groups on the market for stabilizers are compounds based on calcium (calcium-zinc and organo-calcium), lead, and tin stabilizers as well as liquid and light stabilizers (HALS, benzophenone, benzotriazole). Cadmium-based stabilizers largely vanished in the last years due to health and environmental concerns.
Tris(2,4-di-tert-butylphenyl)phosphite is a widely used stabilizer in polymers.
Partial structure of typical hindered amine light stabilizers, widely used to protect automotive paints from degradation by UV-light.
Some kinds of stabilizers are:
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