What Plastics are used in Injection Moulding?

Thermoplastic Injection Moulding is the most commonly used method to manufacture Injection Moulded Parts, but you may be wondering what plastics are the best to use in the injection moulding process. Thermoplastics are basically polymers that can be liquified and turned molten by being heated up ( in the barrel of the moulding machine ) and then softened and cooled once they have been formed / moulded (inside the moulding tool).

So what plastics are used in Injection Moulding?

The most commonly used are :


Polypropylene (PP)

This is a widely used, cost effective polymer known for its good all round use and flexibility. Its main characteristics are its high melting point, excellent impact strength, good resistance to stress and cracking and also it has good resistance to water, acids and detergent.

PP is food safe as it does not “leach” chemicals, it can be commonly found in a wide variety of household goods – we use PP when moulding First Aid Boxes and also Weaving Bobbins for the textiles industry


Polyamide – Nylon (PA)

Nylon Material is used in a wide range of different applications due to its electrical properties, toughness and wear resistance. Nylon is a tough, strong material with a high level of stability and is resistant to abrasion, impact and chemicals.

PA is most commonly used and found in the products used in the automotive and medical sectors. We use nylon extensively in producing engineering parts used in the lock making industry as well as internal parts in window and door manufacture


Polycarbonate (PC)

Polycarb is a naturally transparent, amorphous thermoplastic. PC is used primarily when impact resistance and good transparency are needed. Unlike many other thermoplastic polymers, PC can undergo large plastic deformations without cracking or breaking.

PC is commonly used in the manufacture of DVD disks and Medical devices.

We manufacture PC in the production of lighting diffusers and covers.


Acrylonitrile Butadeine Styrene (ABS)

ABS  is an opaque Thermoplastic and amorphous Polymer. It is referred to as a Terpolymer as its composition is made up, as the name suggests, of three distinct monomers – Acrylonitrile, Butadeine and  Styrene. Together they create a polymer and product that is light in weight, flexible and easily mouldable.

ABS has good impact resistance, heat resistance and toughness. ABS is found in a wide variety of everyday items including drain pipe systems, miscellaneous kitchen items and even lego bricks.


To find out more about our plastic injection moulding services and the plastics we use here at Moldwel please give us a call on 01922 631252 where our helpful team will be happy to advise you further.

If you enjoyed reading this article you may also like to read our previous post on plastic injection moulding companies in the UK.

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