This type of plastic uses heat to harden or set

This type of plastic uses heat to harden or set

• A. Thermoplastics
• B. Thermosetting plastic
• C. Metal
• D. Wood

Answer: (B)

Heat-induced curing that creates a permanent, rigid network is what defines thermosetting plastics. When these materials are heated, a chemical reaction occurs (cross-linking) that bonds the polymer chains together, so the material hardens and cannot be melted back to a liquid. Once set, applying heat won’t soften them in the way it does with many other plastics, which is why they’re used for durable coatings, adhesives, and molded parts. This behavior distinguishes thermosetting plastics from thermoplastics, which soften or melt when heated and can be reshaped. Metals and wood aren’t plastics and don’t undergo this heat-initiated curing process.

Heat-induced curing that creates a permanent, rigid network is what defines thermosetting plastics. When these materials are heated, a chemical reaction occurs (cross-linking) that bonds the polymer chains together, so the material hardens and cannot be melted back to a liquid. Once set, applying heat won’t soften them in the way it does with many other plastics, which is why they’re used for durable coatings, adhesives, and molded parts. This behavior distinguishes thermosetting plastics from thermoplastics, which soften or melt when heated and can be reshaped. Metals and wood aren’t plastics and don’t undergo this heat-initiated curing process.