CSWIP Plastics Welder Approval Practice Questions - CSWIP Plastics Welder Approval (TWI BS EN 13067) Exam

How do thermoplastic polymers differ fundamentally from thermosetting plastics during heating?

Thermoplastics cross-link permanently when heated and decompose without melting. Thermoplastics soften and melt reversibly upon heating and solidify upon cooling without permanent chemical change. Thermosetting plastics can be repeatedly melted and re-moulded into new pipe shapes. Thermoplastics do not expand or contract when subjected to temperature changes.

Correct Answer:

Thermoplastics soften and melt reversibly upon heating and solidify upon cooling without permanent chemical change.

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