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JEE Main 2026 Preparation: Question Papers, Solutions, Mock Tests & Strategy Unacademy » Difference Between » Thermoplastic and Thermosetting Plastic

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Thermoplastic and Thermosetting Plastic

The difference between thermoplastic and thermosetting plastic is that thermoplastic melts when heat is added to it and thermosets become harder and harder by the addition of heat.

Table of Content

The name of these materials itself suggests that these plastics are somehow related to thermal properties. Yes, they are, they are the kind of plastics that change with the effect of temperature. We’ll see how. Although, their names are quite similar. However, thermoplastic and thermosetting plastics have many differences among them, based on their process of manufacturing, properties and applications. Any product designer or manufacturer must understand the difference between these and work on the design or the model as needed. Let us look at some differences between these on some important basics.

Definition

Thermosetting Plastics: These are special kinds of plastics or different from traditional plastics as when we heat traditional plastics they deform by more and more heating. However, a thermosetting plastic is a plastic that adapts to initial heat supply and changes its chemical and physical properties to it and no change occurs in the plastic if we add any more heat to it. Some examples of thermosetting plastics: Phenolic, Epoxy, Silicone, polyurethane, etc. It is just like boiling an egg. When we boil eggs the material inside gets tight and further addition of heat does not change the properties on inside stuff. A Thermosetting plastic behaves also in the same way Thermoplastics: Thermoplastics are another special kind of plastic that is very much versatile and recyclable. These form when repeating monomers units link into a chain-like form. A thermoplastic usually melts when heat is supplied to it and more supply of heat may convert it into its liquid form or melted form. Which determines its 100% recyclability. And the melted form can be remoulded into any desired shape or product. Some examples of thermoplastics are Teflon, Nylon, Polyester, Polystyrene, Acrylic, etc.

Advantages and Disadvantages

Thermosetting Plastics

Advantages	Disadvantages
Very hard and rigid products can be formed	This kind of plastic cannot be recycled
Very highly cost-effective	Cannot be reshaped or remodelled
Have very good dimensional stability	Have very poor thermal conductivity
Have very high resistance against temperature	Can not be used in high vibrating devices. As it will break in vibration
Gives good aesthetic finishes

Thermoplastics

Advantages	Disadvantages
These kinds of plastics are highly recyclable	Get soften when heated, thus cannot be used where the plastic is needed to be in solid shape
Can be remodelled to any shape	Expensive than thermosetting plastics
Can be used in electrical insulation
Have high corrosion resistance
Have very good impact resistance
Have high adhesiveness to metals
Gives superior finishes aesthetically

Curing Process

Thermoset plastics polymers mix to create permanent covalent bonds during the hardening phase and are often generated utilising the RIM (Reaction Injection Modelling) or Resin transfer modelling method (RTM), etc. When the substance is warmed, this chemical process generates connections within monomer chains inside the substance, preventing it from recovering to its previous liquid form. Thermoset polymers also have greater mechanical qualities, making goods constructed of them more resistant to distortion and damage. Whereas, Thermoplastics melt and ultimately turn liquid when overheated. Thermoplastics are processed without complex formation, allowing them to be remoulded and reused without compromising their material qualities. The qualities of thermoplastic polymers vary greatly, but materials created from them are known for their resistance to shrinkage as well as their strength and flexibility.

Industrial Used and Applications

Thermoplastics and Thermosetting plastics both have their usage in industries and daily use based on their advantages. As thermoplastics are capable of handling corrosive environments and work well with metals. However it cannot hold it in high temperatures. Whereas, thermosettings have rigid properties and have high resistivity to temperature. Some uses are listed below:

Thermosetting Plastics

Used in medical and electrical components
Auto parts
Used in military vehicles
Used in chemical generation piping or cell covers
In agriculture fields

Thermoplastics

Making of belts and ropes
Storage tank for liquids
Used as a protective cover for equipment that is very rigid
Used in bottles
Insulation of electric cables

Used in biomedical, medical, construction, electrical and many other fields.

Conclusion

To sum up, the difference between these two plastics is that thermosetting plastic and thermoplastics are special kinds of plastics that have their properties changed when introduced to heat or temperature. A thermosetting plastic initially uses heat and change their chemical and physical properties according to it. And further addition of heat will not alter any properties of it. However, a thermoplastic melt in the introduction of heat and thus can be 100% recycled. Both thermosetting and thermoplastics are used in industries and daily lives such as the manufacturing of bottles, plastic bags, electrical cable insulations, protective equipment, ropes, cables, medical appliances, storage tanks, etc.