Thermoplastics liquidate and become flexible when heat. Its polymers can be reheated and reworked several times, which in the case of thermosets is impossible.

Fremont, CA: After curing, thermoset plastics are set and are usually stronger than thermoplastics. The polymer is initially a liquid or soft solid and later becomes hard when it is healed. Thermosets are used for several applications due to their high mechanical and physical resistance, heat resistance, corrosion, and mechanical creep. Alkyds, epoxy, phenolic, polyimides, thermoset polyesters, etc., are some of the popular thermoset materials used for the injection molding method.

Thermoplastics liquidate and become flexible when the heat is applied in contrast to the thermoset. Thermoplastic polymers can be reheated and reworked several times, which in the case of thermosets is impossible. These types of polymers can typically be stored as pellets before molding without causing any harm to the material and can withstand several restructurings. They have high strength, resistance to shrinkage, flexibility, resistance to high impacts, and resistance to chemicals. Among others, ABS, nylon, PET, polypropylene and polyethylene and TPE, are among other popular thermoset materials used in the process of injection molding.

The difference between thermosets and thermoplastics are:

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• Cold material is injected into an incredibly hot mold to create parts.

• Form a chemical bond permanently.

• Cannot be remolded or re-formed

• Really hard to finish the surface

• Compared to the formation of thermoplastics, thermoset injection molding does not need high heat and high pressures.

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• They are often prepared by condensation polymerization.


• Plastic material is melted and injected into a mold to produce parts.

• 100percent reversible because during the process, no chemical bonding occurs.

• Can be recycled and remolded

• Thermoplastics for injection molding create surface finishes that are versatile, accurate, and aesthetically pleasing.

• High heat and pressure are needed for thermoplastic injection moldings.

• Mostly prepared by further polymerization.