What plastics are used for injection molding?
Plastic part manufacturers most commonly use thermoplastics for injection molding. Thermoplastics are polymers that melt at high temperatures and solidify at low temperatures. Unlike thermoset materials, which burn if reheated, you can heat and cool thermoplastics multiple times to degrade them to the point where they are unusable.
You most often see thermoplastics in the form of plastic pellets for injection molding. You can mix plastic pellets with colorants, recycled materials, and even glitter or other special additives.
The most common types of thermoplastics are:
1. Acrylonitrile Butadiene Styrene (ABS)
ABS is a rigid and lightweight material. It is a very popular material for plastic injection molding. Did you know that Lego bricks are made of ABS?
2. Polycarbonate
Polycarbonates are transparent thermoplastics. They are impact resistant and can withstand high levels of plastic deformation without breaking or cracking. Manufacturers often use this type of thermoplastic for eyeglass lenses, medical devices, and mobile devices. You can even use it to make bulletproof glass!
3. Nylon
Nylon has unique electrical properties and is tough. From sports equipment to industrial parts, you'll find this type of thermoplastic in a wide range of applications.
4. Polypropylene
Polypropylene is a flexible material. It also has good chemical resistance and won't leach into food, making it an ideal choice if you want to make food containers or cutlery.
5. Polyethylene
Polyethylene is one of the most versatile plastics used for injection molding. Polyethylene's high ductility, tensile strength, impact resistance, low moisture absorption, and recyclability make it an ideal material for plastic containers and bags.
