General Purpose polystyrene is one of the most widely used plastics in the world. This polystyrene is a simple example of a plastic that, unlike HIPS polystyrene, does not impact resistance.

It has a transparent appearance and has various applications in the industry. There are several methods for molding this polystyrene, which we will examine in the rest of this article. If you do not know or do not know enough about General Purpose polystyrene, join us in this comprehensive GPPS article.

How to produce General Purpose polystyrene

produce General Purpose polystyrene

produce General Purpose polystyrene

GPPS is one of the most widely used polystyrenes in the world. It is made by the polymerization reaction of the styrene monomer. It is made of transparent and cylindrical granules and after proper molding, it becomes its final shape. Molding of this polystyrene has different methods and is usually done at a temperature of 190 to 230 degrees. The final shape of the General Purpose polystyrene product is clear or colored and glossy. It should be noted that this is one of the cheapest polystyrenes.

In general, the use of polystyrenes in different grades is done due to their cheapness and special features. So that every day we see different devices that are made using polystyrene.

Applications of General Purpose polystyrene in the world

Applications of General Purpose polystyrene

Applications of General Purpose polystyrene

General Purpose polystyrene is obtained from styrene monomer. Called GPPS for short, it is involved in the production of various products. It is produced in the form of granules and after molding, it becomes the desired shape. GPPS is low-pressure resistant; But if a lot of pressure is put on it, it breaks easily.

The flowability of this material is good and it has various uses in making devices. For example, the following can be mentioned:

  • Production of toys
  • Production of pendants as well as plastic items
  • Production of plastic cups
  • Production of molds and CD caps
  • Production of IT equipment
  • Manufacture of laboratory kits and equipment
  • Petri dishes
  • Bathroom accessories
  • Manufacture of medical devices
  • Manufacture of laboratory tubes
  • Making jewelry boxes
  • ..

Other types of polystyrene in the world

GPPS Types

GPPS Types

1. High-density polyethylene:

These polyethylenes are used in the manufacture of various household items such as bags. High-density polyethylene is also used to make lids and household utensils, as well as for injection and impact molding. It is very strong and has good transparency. It is also easy to produce and has a variety of uses.

2. High Impact polystyrene

High impact polystyrene or HIPS is much more durable than General Purpose polystyrene. This polystyrene is used in the manufacture of various plastic devices. HIPS is less transparent than GPPS, But it is very resistant to various pressures. In addition, it has good flowability and is used in injection molding. In addition, this polystyrene is also used in the manufacture of freezer sheets.

3. Ethylene-vinyl acetate

It is used in the manufacture of thermal adhesives. Ethylene-vinyl acetate is also used in various molding processes. In addition, this material is also used in the manufacture of various viscous materials.

4. Low-density linear polyethylene

Unlike the first case, this material has very high transparency. Low-density polyethylenes are used in the manufacture of auto parts, disposable tableware, and toys. It is also used in ice cans and house doors.

5. Polypropylene

This material has many different uses. Polypropylene can be used for injection molds. It can also be used to make toys. In addition, polypropylene can be used to make high-strength plastic devices.

6. Copolymer

Copolymers, which are strong and transparent materials, are used in the construction of transparent doors and containers. These materials are also used to make durable consumer goods.

As mentioned, General Purpose polystyrene has many uses. The production of this material has led to the development of various plastic industries. In addition, the cheapness and ease of use of GPPS have made it accessible to people all over the world. This transparent polystyrene has a very important role in making disposable tableware and home appliances.

A complete comparison of General Purpose (GPPS) and High Impact (HIPS) polystyrene

gpps or hips

gpps or hips

We know that polystyrene is one of the most popular thermoplastic materials in the world. These materials are made by different processes and all have unique properties. Depending on your needs, you can buy General Purpose polystyrene or High Impact polystyrene.

To buy GPPS and HIPS, you must first know their features and applications. The properties of these polystyrenes are special and they have various uses. In the continuation of this article, we will provide you with a complete comparison of these two types of polystyrene.

Similarities between GPPS and HIPS

Despite the differences between the two polystyrenes, there are some similarities between them. for example:

  • GPPS and HIPS polystyrene are cheap.
  • The molding methods for the production of these plastics are thermoforming, extrusion, and injection molding methods.
  • These polystyrenes are also used in the manufacture of medical and health devices.
  • These polystyrenes are easy to make and can be easily shaped.
  • General Purpose polystyrene and high impact polystyrene are recyclable.
  • These polystyrenes comply with FDA rules and standards. For this reason, they are used in the packaging of various foods.

The main differences between GPPS and HIPS

Despite the similarities between the two polystyrenes, there are some differences between them. for example:

  • General Purpose polystyrene is cheaper than HIPS.
  • In general, HIPS resistance is much higher than GPPS; So HIPS can be used to make impact-resistant devices.
  • GPPS has little structural stability. Unlike HIPS, it is very transparent and soft.
  • GPPS is very clear and has a glassy appearance. This has made the use of General Purpose polystyrene in food packaging better. In addition, HIPS has a thin transparent edge and is usually semi-transparent elsewhere.

Interesting properties of General Purpose polystyrene

General Purpose polystyrene is made by different methods of making polymer. In addition, polystyrenes are made by the suspension polymerization method. In addition, GPPS has the following features:

  1. This material has low absorption against water.
  2. It has excellent electrical properties.
  3. GPPS is X-ray resistant.
  4. This is completely non-toxic.
  5. This is fragile polystyrene. Low GPPS resistance to pressure is one of the disadvantages of this plastic. In addition, this material has low resistance to heat.
  6. Under optimal conditions, GPPS retains its mechanical properties and overall shape.
  7. One of the most interesting advantages of General Purpose polystyrene is that it can be dissolved in ketones and esters. In addition, GPPS can be dissolved in chlorinated hydrocarbons.
  8. It is resistant to organic acids, alkalis, mineral salts, and mineral oils.

Thermoplastic molding methods

We see in the life around us that plastic has many uses. This widely used material is used in various automotive and medical equipment industries. In addition, the good performance of these materials in maintaining stability and resistance to impact and heat has led to their use in the manufacture of food packaging.

Thermoplastic molding varies according to the needs of buyers. Each of these molding methods has advantages and disadvantages. Here are four important methods of molding thermoplastic materials:

Injection molding

Injection molding

Injection molding

This method is one of the most diverse molding methods; Because you can use this method to make different pieces in the same shapes. The basis of injection molding is very simple! But in the actual process, the molten plastic is injected into a steel mold. So it can be a challenging way.

The molds used in this method have holes in their surface. This fall mold is filled after the injection of molten plastic. These filled spaces are now being cooled and attractive, high-quality plastics are being made. The advantage of this method is that you can also produce your design. A steel mold is made for your product and then your plastic is ready!

The cost of this method is very reasonable for mass production. Production of General Purpose polystyrene by injection molding is a very good and of course challenging method. In addition, this method is cheaper than other molding methods; Because less plastic waste is produced and plastics are made with higher quality.

Compression molding

Unlike the injection method, plastic does not heat up in compression molding. The molding machine is heated and cold plastic is placed inside the mold. This plastic heats up with a lot of pressure and comes in the form of a mold. After the plastic manufacturing process is over, the machine and the plastic are cooled and the final product is ready!

This method assures you that your final product will be completely stable. In addition, it is very convenient to use this molding method to make complex parts. Materials made in this way are very durable; Because during molding, the pressure of the molds causes a very good shape to the mold.

Compression molding is used to make various car parts as well as durable plastics. In this method, fiberglass, reinforced plastics, and also thermal resins are used so that the final product has high quality and resistance.

Pneumatic molding

This method is similar to making glass! In making glass, the method of blowing inside the pipe is used. This method is also used in General Purpose polystyrene molding. In this method, a piece that determines the shape of the plastic is heated. The air is then blown into it and the plastic is shaped as desired.

In the continuation of the process, after cooling the plastic part, the final product is separated from the mold. The pneumatic molding method is very suitable for making hollow objects; Because the final product is made very regular and uniform.

In addition, pneumatic molding is used to make small plastics, plastic bottles, and large plastic containers. Materials that are poured into pneumatic molds are low-density polyethylene, polypropylene, PVC, high-density polyethylene, and polyethylene terephthalate.

Extrusion molding

In this method, melted plastic is used to perform the process. In this method, the shape of the mold determines the final shape of the plastic. This method is suitable for making long and smooth parts and is not very suitable for making highly detailed plastics!

In addition, this method uses molten plastic materials, like injection molding. These materials enter the mold and dry after molding. The molten material is usually made into a long tube. Then the machine cools down and the plastic material is ready! This method is used to make straws and plastic pipes.

Effects of General Purpose Polystyrene on the Environment

Plastics are very useful and popular products. These substances are currently causing more pollution on Earth. So we have to find the best ways to recycle General Purpose polystyrene. Our experts in the field of production of General Purpose polystyrene as well as recycling of this material, have gained good information and experience. You can contact us to buy General Purpose or GPPS polystyrene. In addition, you can contact our experts for a free consultation.

A summary of the General Purpose polystyrene review

General Purpose polystyrene is one of the most popular polystyrenes in the world. This material is interesting, transparent, and has little impact resistance. It is used in the manufacture of various medical plastic devices and home appliances. In addition, GPPS is used to make auto parts, toys, and plastic cups.

We explained General Purpose polystyrene molding methods in this article. We hope we have answered your questions about this valuable material. If you find this article useful, please send it to your friends.


What is the exact definition of General Purpose Polystyrene?

General Purpose Polystyrene or GPPS, one of the most important grades of polystyrene used in global industries. This polymer is transparent, breaks easily, and is inexpensive. It is very popular for producing disposable tableware.

What are the most important differences between GPPS and HIPS?

These materials are polystyrene grades that are composed of bonded styrene monomers. GPPS is one of the best grades of polystyrene for the production of transparent plastics and disposable containers. It is easily produced and recycled. HIPS polystyrene is translucent and highly impact resistant. This polymer is easily recycled and used to produce durable plastics.

What are the major applications of GPPS in the world?

This is one of the most important polystyrenes used in various industries. It is very transparent and is used to produce disposable tableware. In addition, GPPS is used to manufacture containers, packaging, home appliances, auto parts, films, and medical supplies.

What is the shape of General Purpose Polystyrene?

This polymer is produced in solid and sheet form. In addition, this grade of polystyrene is transparent and breaks easily. GPPS applications are very diverse; This polymer is used to produce a variety of car interior parts, toys, and home appliances.

What is the molecular structure of GPPS?

This polymer is composed of a bond of styrene monomers. Styrene has the structural formula (C8H8)n; In general, if we have 200 hydrogen atoms in a polymer, we also have 200 carbon atoms. Production of GPPS polystyrene is done by polymerization processes.

Is General Purpose Polystyrene water-resistant?

It consists of the polymerization and bonding of styrene monomers. This grade of polystyrene is very resistant to water; In addition, it is resistant to sunlight. This polystyrene is also used to insulate buildings and floors.

Is GPPS polystyrene harmful to human health?

Contrary to popular belief, it does not contain a lot of chemicals! This polystyrene is composed of connecting styrene monomers and has simple molding processes. These processes make the polymer non-toxic; In addition, it is not dangerous to human health and the environment. But if this polystyrene is not recycled properly, it will cause environmental pollution.

Is General Purpose Polystyrene Recyclable in Global Industries?

GPPS is easily recycled and used to make plastics all over the world. GPPS recycling is simple and inexpensive, but it must be done in bulk so as not to reduce factory investment.

What are the production methods of General Purpose Polystyrene?

There are several ways to generate GPPS. GPPS molding steps are performed after the production of polystyrene sheets. The molding of this polystyrene is simple but must be done by the standards. For example, vacuum molding and injection molding are two methods of GPPS molding.