Random Copolymers
Random copolymers (RACO) are produced by statistical insertion of units of ethylene or higher a-olefins (mostly butene, also in combination with ethyle to give terpolymers). Through this, the glass transition temperature and melting point are lower than in homopolymers, allowing better sealability and application at temperatures below 0C.

Rheology
the study of the change in form and the flow of matter, embracing elasticity, viscosity, and plasticity.
________________________________________