plasticizer

n. substance added to plastics or other materials to give it pliability and reduce fragileness (also plasticiser)

Plasticizers are additives that increase the plasticity or fluidity the material to which they are added, these include plastics, cement, concrete and clay bodies. Although the same compounds are often used for both plastics and concretes, the desired effect is slightly different. The plasticizers for plastics soften the final product increasing its flexibility. Plasticizers for concrete soften the mix before it hardens, increasing its workability, and are usually not intended to affect the properties of the final product after it hardens.
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Noun
1. a substance added to plastics or other materials to make them more pliable
(synonym) plasticiser
(hypernym) softener
(derivation) plasticize, plasticise

plasticizer /'plæstisaizə/
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