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The Difference between Thermoplast and Thermosetting Plastics


Thermoplastic refers to the material in the heating can occur when the flow deformation, after cooling can maintain a certain shape of the nature. Most of the linear polymers are thermoplastic, it is easy to extrusion, injection or blow molding process. Therefore, the thermoplast refers to a plastic having a softening and cooling hardening property. Most of the plastics used in our daily lives belong to this category. When heated to soften and flow, cooling hardened, this process is reversible, can be repeated.

Thermoplast are one of the most widely used plastics, the main components of thermoplastic resin, and add a variety of additives and preparation of plastic. In a certain temperature conditions, the plastic can soften or melt into any shape, the shape of the same cooling after this state can be repeated and always have plasticity, and this is only a physical change, said the plastic is thermoplast.

Since there are thermoplast, it is about thermosetting plastics. Thermosetting plastics are made of thermosetting resins and are formulated into plastic products by cross-linking curing processes with various necessary additives. In the pre-manufacturing or molding process for the liquid, after curing insoluble and can not be hot or soft again. Common thermosetting plastics are phenolic plastic, epoxy plastic, aminoplast, unsaturated polyester, alkyd plastic and so on. Thermosetting plastics and thermoplastics together constitute two synthetic systems in synthetic plastics. Thermosetting plastics are divided into formaldehyde cross-linking and other cross-linked type.

What is the difference between them? Thermoplast is plastics that can be softened and cooled hardened over a specific temperature range (eg ABS, PP, POM, PC, PS, PVC, PA, PMMA, etc.) and can be recycled. Thermosetting plastics are plastics that are made of non-melting after heating and are no longer plasticized and can not be recycled again (eg, phenolic resin, epoxy resin, amino resin, polyurethane, expanded polystyrene, etc.).

Thermoplast soften when heated, easy to melt, and melt into a transparent, often from the melt to pull the wire, usually easy to heat. Thermosetting plastics heated to the material before the chemical decomposition, to maintain its original hardness is not softened, the size is more stable, to the decomposition of carbonization.