a. Polyurethane (PUR) Various materials with very different properties can be prepared from PUR (e.g. thermoplastic elastomers, foams, rigid elastomers). PUR elastomers have properties such as high damping and abrasion resistance; they are resistant to ageing and sensitive to hot water, acids, alkalis. b. Acrylonitrile-butadiene-styrene copolymer Depending on the composition, ABS hasgood impact strength (butadiene content) and good heat resistance (acrylonitrile content). The impact strength can be drastically impaired by the coating (stress cracks).The resistance to weathering is poor and ABS tends to become brittle. ...