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01_Injection Molding_Knowing the Different Kinds of Plastics

Knowing the Different Kinds of Plastic through China’s Injection Molding Industry

By Carter Kho

The injection molding industry has become one of the most profitable and lucrative industries over the past few years. This is mostly due to the high demand of plastic products, which have become a regular item at home, work, school, and other places. Plastic has indeed become one of the most valued materials, thanks to its versatility and durability, as well as its availability for numerous purposes.

Ever since the discovery of various polymers, plastic has evolved into a reliable and trusted material to manufacture various products. With the development and innovation of plastic injection molding machines, companies all around the world are now able to manufacture quality plastic products that would address the needs and demands of the consumers.

These machines are the heart of these industries, as they are responsible for producing all the important items that they would need. Products are produced by dropping in plastic pellets into the machine, which the machine heats up until it turns into liquid.

The liquefied plastic then goes through a nozzle and into the mold. Once the plastic enters the mold, the process of cooling and hardening begins. Once the plastic has cooled down and hardened, it would now be removed from the mold. This process can be repeated over and over again, while making sure that the quality remains the same.

This ability to produce quality products within a short time period allows these companies to be able to deliver their products within designated schedules, ensuring that clients and consumers would be able to receive them on time.

While the process of injection molding is simple and straightforward, the process of picking the right kind of plastic is another story. Along with designing the mold, mixing in the correct kind of plastic formula is also essential, as there are specific products that require certain kinds of plastic to be of the right quality.

To help you figure out the different kinds of plastics, here is a list that you can refer to:



Discovered in the 1800s in Germany, polyethylene is the most widely used plastic all over the world. It is the base material of a wide majority of products that people use today, including water bottles and grocery bags. It was even used as a secret material during the Second World War due to its durability and ability to reduce radio waves.

There are three kinds of polyethylene plastic, namely high-density polyethylene, low density polyethylene, and ultra-high molecular weight polyethylene. Here are their properties:

  • High Density Polyethylene – This material is known for its hardness, and therefor is used in items such as laundry and cleaning bottles, containers and bins, toys, and plastic casings.
  • Low Density Polyethylene – This light material is used for items such as plastic bags, packaging films, trays, hardware casings, protective shells, and even playground materials.
  • Ultra-high Molecular Weight Polyethylene – Perhaps one of the strongest plastic materials being used today, this material is used for products like hydraulic seals, bulletproof vests, climbing cords, marine cables, wiring protection, and even artificial limbs and other parts.

Polyethylene Terephthalate (PET)

Also known as one of the most widely distributed types of plastic around the world, this is another kind of material that is used for plastic bags and water bottles. It is also commonly used as a fiber, known as polyester, and is used in the apparel and cloth industry. Polyester fabric is known to be highly durable, and resistant to water, which makes it a good weatherproof cover for containers and other items.

Another benefit of PET is that it is a highly recyclable form of plastic. This means that the material can be reused and repurposed into different materials. Overall, this is a light plastic that is both reliable and environmentally friendly at the same time.


Polyvinyl Chloride (PVC)

Known for being a material used for industrial and construction purposes, PVC is a durable and cost-effective material that is highly resistant to various substances that can damage most kinds of plastics. PVC is easy to design and mold, which makes it a versatile industrial and commercial material. It can be used as rigid and strong material, and can also be used as soft and lightweight material.

Due to its versatility, PVC can be used for many different objects like pipes, vinyl records, signage, furniture, flooring, and cables. PVC piping is one of the most common products made from this material, as the plastic does not corrode, unlike conventional metal piping.



This material is most commonly known as nylon and is one of the most commonly used types of plastic in the injection molding industry. Nylon is known to be highly durable and flexible. It can withstand high temperatures, and various chemicals and other substances, which makes it a popular industrial material.

With this in mind, nylon is commonly used in ropes and cords, especially ones for climbing and heavy-duty purposes, clothing, and mechanical equipment. It is even used as a substitute for certain metals in automotive parts as well.

Nylon is one of the most available materials around, and provides some of the best durability and quality that you would need.



Another strong and durable type of plastic, polypropylene is known as a highly adaptable kind of material as well. It is a material that is cheap to produce, has a high melting point, and is resistant to acid. It is also one of the types of plastic that are safe for food, which makes it ideal when manufacturing food containers.

Aside from that, polypropylene can also be used to produce products such as modeling kits, packing tape, bottle caps, chip bags, drinking straws, clothing items, and even medical tools and supplies. Due to its versatility and adaptability to various manufacturing techniques, it is also one of the most in demand materials in the injection molding industry.



Unlike other kinds of plastics, polystyrene is used in the packaging of various finished products. This kind of plastic is commonly known as Styrofoam, and is used to protect various items from any form of contact that may damage it. This kind of polystyrene is known as General Purpose Polystyrene.

There are two other kinds of polystyrene, namely High Impact Polystyrene and Expanded Polystyrene. High Impact Polystyrene is more durable and is translucent. This is used to protect electrical components, and is used for construction aids. Expanded Polystyrene, meanwhile, is fluffed up with air during the molding process, and is used as padding for motorcycle, car helmets, and protective padding.


Acrylonitrile-Butadiene-Styrene (ABS)

Another common material used in injection molding, ABS is a type of plastic that is affordable to manufacture, durable, easy to melt, readily available, and is highly resistant to corrosive chemicals. This is one of the easiest materials to handle when using injection molding machines.

Products that use ABS include toys, automotive gauges, consoles, and asthma inhalers. With its simplicity, ABS is a plastic that is very much present in a wide variety of products.


Polyoxymethylene (POM)

Known commonly as Acetal, this kind of plastic is known for its low friction, high durability, and high temperature resistance. These qualities allow it to retain its shape after going through the molding process. Its strength makes it comparable to some of durable metals, which makes it a lighter alternative to certain moving parts.

Acetal is used for products like mechanical gears, wheels, locking parts and mechanisms, as well as bindings.


Polyurethane (PU)

One of the most flexible plastics available, polyurethane is a highly durable plastic that is known for its softness. This softness allows some extra grip and flexibility for various products. This can also come in liquid form, which is used in sealants, adhesives, and varnishes.

Products that are known to use polyurethane include different kinds of shoes, slippers, and sandals, furniture foaming and cushions, and various gripping surfaces in devices and machines. One of the softest plastics around, polyurethane is versatile, and has the durability that can withstand a lot of different elements.



Another high impact type of plastic, polycarbonate is known for being transparent, and highly durable compared to other plastics. This helps it become resistant to different kinds of substances and high temperatures, which makes it great for construction and industrial usage. Manufacturers can also create glossy finishes by using polycarbonate, and add some vivid colors for variety. The material is also scratch resistant, which is another quality it can achieve due to its durability.

These properties make it a material that can be used for products like greenhouse roofing and windows, and riot shields for soldiers and police. The plastic is also known for being used in products such as light switches, and screens for gadgets and devices. Plus, being a material used in greenhouses, this kind of plastic is environmentally friendly as well.



Another high impact type of plastic, polycarbonate is known for being transparent, and highly durable compared to other plastics. This helps it become resistant to different kinds of substances and high temperatures, which makes it great for construction and industrial usage. Manufacturers can also create glossy finishes by using polycarbonate, and add some vivid colors for variety. The material is also scratch resistant, which is another quality it can achieve due to its durability.

Another transparent plastic that is durable and scratch resistant, acrylic is highly transparent, which makes it a common fixture in various gadgets and devices. Also, in the event that the plastic breaks and shatters, it is less likely to cause harm and injury when it comes into contact with human skin and other sensitive parts of the body.

Other than being used in screens for gadgets and devices, acrylic is also used in lenses, containers, and medical supplies as well.

Overall, there are many different kinds of plastics being manufactured today. Each one of them has their strengths and benefits, which allow them to be manufactured into various products. These types of plastics are guaranteed to be able to provide the best qualities to the items they will be molded into, ensuring that they will be of the highest quality. With companies all over the world aiming to create quality plastic products, these materials would ensure them that they would be able to deliver. If you are looking for quality plastic products, you can look for Richfields Corporation Limited to provide them for you.

Where to find quality plastic products?

At Richfields Corporation Limited, you are guaranteed that you would be able to receive top of the line and high-quality products, as our company ensures that their manufacturing facilities would be able to deliver.

What is Richfields?

Richfields Corporation Limited is a molding company that was founded in 2001. The company was organized by multiple investment groups from Hong Kong. Along with multiple investors, the company also had the support and skill from some of the most experienced plastic manufacturing personnel from China.

The company began producing its first plastic injection molds in 2004, and distributed it to various clientele worldwide. The company produces over 300 different kinds of molds per year for both export and use within China.

Why choose us?

Richfields Corporation Limited is a company known for its excellent customer service, and our ability to be able to provide you quality products and deliver it on time. Since the manufacturing facilities are within China, this allows the company to offer competitive prices that match up with some of the world’s best. The diverse product variety also allows the company to cater to various international clients and customers. Due to its multinational nature, the company is able to establish good communications with our clienteles, which allows our network to keep growing as the years go by.

What are our products?

Richfields Corporations Limited offers a wide variety of products, some of which include home and safety products, along with various types of molds that can be used to create different kinds of items, like runner molds and precision plastics. For more information about our products, you can visit this page.

What are the other services we offer?

Richfields Corporation Limited has two main services: Plastic Injection Mold Design and Plastic Injection Mold Repair. We make sure that we deliver these in the highest quality for our customers, which is why we are fully committed to fulfill their requirements through our mold making services.

Contact Us

If you have more inquiries with regards to our products and services, you can email us at ckho@richfieldsplastics.com, call us by phone (+86-769-87888726), or contact us though fax (+86-769-87909012).