Industrial Rubber Ltd | Advantages of injection moulding 0

Advantages of injection moulding

Advantages of injection moulding

Published - 14th Jun 2022

Moulding is a common manufacturing process, where the liquid material is inserted into a mould cavity in order to create a product or part. There are a number of different types of mouding, including injection moulding.

Widely used to create custom and standard parts, injection moulding is one of the most common rubber moulding methods with many advantages and benefits.

What is injection moulding?

Injection moulding is a rubber moulding process that uses injection technology to inject the raw material into the mould cavity.

A hot liquid compound such as rubber is injected into a closed cavity and vulcanised. This produces a stable, perfectly-cured rubber requiring little to no post-production trimming.

Injection moulding technology can be used to create complex, intricate parts and large production runs.

What is injection moulding used for?

Injection moulding can be used to create a wide variety of parts for applications in a number of different industries, including:

  • Construction industry – seals, gaskets, grommets, tubing, vibration control
  • Automotive industry – engine parts, valves, extrusions
  • Agricultural industry – seals, noise control, bushings, suspension, vibration control
  • Medical industry – seals, medical equipment, tubing.

How does injection moulding work?

The injection rubber moulding process typically follows the process below:

Step 1 – A mould is created to meet the manufacturing requirements

Step 2 – Uncured rubber is fed into the screw of the injection moulding machine

Step 3 – The rubber is then pulled into the injector

Step 4 – The rubber is liquidised at a high temperature

Step 5 – The polymer is then moved into the injection mould cavity via a runner and gate

Step 6 – The rubber is cured and vulcanised at high pressure and temperature

Step 7 – The finished part is removed from the mould cavity

Advantages of injection moulding

Injection moulding offers a number of advantages, it is cost-effective, especially when making custom rubber components to order, it is precise, and can be used to produce a large number of parts per hour. Industrial Rubber Ltd offers custom made, to order a minimum of 500 pieces.

Advantages include:

Faster production cycle time

Injection moulding has a cycle time of approximately 15-30 seconds; this means the technique can be used to produce a significant number of parts per hour.

Lower cost

Injection moulding often involves a lower production cost per unit. This is due to higher levels of automation leading to faster cycle times.

High dimensional tolerance

The injection moulding process can achieve tight tolerances on small, intricate parts.

High consistency

Because injection moulding involves a greater level of automation, it is possible to achieve a much higher level of consistency.

Low flash levels

The force of the injection press clamp ensures that the mould remains tightly sealed during the cycle. This results in higher levels of tolerance and lower levels of flash.

Minimal secondary trimming

Parts that have been injection moulded usually look finished upon completion, meaning that very little, if any, post-production work is required.

Reduced waste

If thermoplastic material is used in the injection moulding process, any excess material or scrap can be recycled and reused.

High quality

The final parts are usually high quality, solid and durable.

Compression moulding vs Injection Moulding

Is compression moulding or injection moulding the most effective process? Both types of moulding offer their own advantages and limitations.

Like injection moulding, compression moulding is a moulding process. However, rather than using injection technology, compression moulding is defined by its use of pressure and heat. During the moulding process, the material is placed into the mould cavity and heated. Plugs are then inserted into the top of the mould cavity and pressurised. The application of both heat and pressure cures the raw material, creating a new part or product.

The main differences between the two technologies are:

Smaller rubber parts – based on size

Injection moulding is ideal for smaller rubber parts requiring tight tolerances. Compression moulding, on the other hand, is suited to creating larger rubber products.

Rubber moulded – based on shape

Compression moulding is suited to producing simpler shapes, while injection moulding allows far more complex rubber parts to be produced.

Cycle time

Compression moulding has a significantly longer cycle time than injection moulding. Not only this, but compression moulding also often requires manual rubber finishing and post-production trimming, slowing down the process further still. Injection moulding is more efficient as the process can be fully automated.


Compression moulding is best used for low and medium volumes of large rubber products. Injection moulding is automated and offers short cycle times, meaning it is possible to produce a high quantity of parts or components quickly.

Quality in injection moulding

Injection moulding typically delivers stronger parts than compression moulding.

At Industrial Rubber, we manufacture a wide variety of rubber parts and components only made to order, not off the shelf, we use injection moulding technology. Get in touch to discuss your needs or to find out more about our rubber moulding services.

Latest News

BS 1154:2003 Natural rubber compounds

01st Aug 2023
BS 1154:2003 is a British Standard specification that outlines the requirements for natural rubber compounds used in various industrial applications. Natural rubber is a highly elastic and durable material made from the sap of the Hevea brasiliensis tree.

BS 2752:2003 Chloroprene rubber compounds

01st Jul 2023
BS 2752 is a British standard that specifies the requirements for chloroprene rubber compounds. Chloroprene rubber, also known as neoprene, is a synthetic rubber that is widely used in various industrial and commercial applications.

BS 2751:2001 General Purpose Acrylonitrile-Butadiene Rubber Compounds

01st Jun 2023
BS 2751 is a British Standard that specifies the requirements for general purpose acrylonitrile-butadiene rubber (NBR) compounds.

What is Nitrile Rubber/ Buna-N?

15th May 2023
Nitrile rubber, also known as Buna-N or NBR, is a popular elastomer that is widely used in various applications because of its oil and fuel resistance properties, as well as its high tensile strength. Nitrile rubber is a synthetic rubber copolymer made of acrylonitrile (ACN) and butadiene.

Viton® – What is it?

03rd May 2023
Viton® may not be a name that’s familiar to you, but it’s a material that you’ve probably come into contact with many times before. Viton® is a synthetic rubber and fluoropolymer elastomer, commonly used in O-rings, gaskets and seals, and is renowned for its ability to withstand even the harshest environments, temperature extremes and harsh chemicals.

ISO 3302-1:2014 Rubber Tolerances for products Part 1: Dimensional tolerances

01st May 2023
ISO 3302-1:2014 is a standard that sets out guidelines for dimensional tolerances for rubber products. This standard is the first in a series of standards for rubber tolerances and is intended to provide a consistent approach to the measurement and acceptance of rubber products.

ASTM D 1056 Standard Specification for Flexible Cellular Materials — Sponge or Expanded Rubber

01st Apr 2023
ASTM D 1056 is a standard specification that outlines the requirements for flexible cellular materials, also known as sponge or expanded rubber.

ISO 2230:2002 Rubber products — Guidelines for storage

01st Mar 2023
ISO 2230:2002 Rubber products – Guidelines for storage is an international standard that provides guidelines for the proper storage of rubber products.