environmental material plastic 2021-04-07T14:40:26Z Kunststoff Plastik "High molecular mass" can be ambiguous as it does not set a threshold for what is considered "high". Here we make no commitment to a threshold. An environnmental material which 1) is composed primarily of polymers with high molecular mass and 2) once deformed does not spontaneously return to its original shape. envoPlastics plastica 塑膠