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Sep. 18, 2023

Processing methods of silicone rubber molding process: compression, transfer, injection molding


The rubber molding process uses heat and pressure to shape raw rubber into the specific shape and size of the desired part. 

Examples of molded rubber products include seals, gaskets, O-rings, pipes and bellows, and other miscellaneous items - just to name a few. Today,

 there are three main types of silicone rubber molding processes: compression molding, transfer molding, and injection molding. Each has its own advantages and applications.

This article from JAPLAU GROP explains the differences between all three methods of rubber molding. Read on to learn which processes you need, 

or request a quote and solutions if you're ready to order standard or custom-molded silicone products. Also including mold solutions, we go all out,

 JAPLAU Group provides all three processes in our Guangdong factory, and we have passed ISO 9001:2015 certification and CE certification.

#1 Compression Molding

Compression molding is the oldest, most basic, and most cost-effective silicone rubber molding process. First, put the pre-measured raw silicone rubber into the mold cavity. This pre-measured quantity, known as the preform, is compressed under high pressure and temperature until the rubber fills the entire cavity. Pressure and heat cause the rubber to flow and take on the shape of the mold as it cures.

Compression molding is best suited for the production of simple shapes and small to medium-volume rubber products such as seals, gaskets, and simple O-rings. The process is relatively simple and requires less machinery than transfer molding or injection molding. All this makes compression molding a popular choice for prototyping and small-scale production.

#2 Transfer Molding

This type of transfer molding is more complex than compression molding, but simpler than injection molding. 

With transfer molding, the raw rubber material is heated in a chamber. When the press is shut down, 

material is transferred to the mold cavity through gates or channels. The mold is then closed and compressed, 

and the rubber solidifies in the cavity.

Transfer molding is best suited for producing complex shapes and high-volume rubber products.

 Typically, it is used to produce electrical connectors, diaphragms, and O-rings of complex designs. 

Because transfer molding allows precise control of the amount of material in the mold, a higher quality product can be produced. 

It also minimizes material waste and reduces the need for post-production touch-ups.

#3 Injection Molding

Injection molding is the most advanced and precise silicone rubber molding process. It is also highly automated, 

which reduces production time and costs. Injection molding involves melting raw rubber material in a heated barrel and then injecting it into a closed mold cavity under high pressure.

 Pressure and heat cause the rubber to flow and take on the shape of the mold.

Rubber injection molding is best suited for producing large quantities of parts with complex shapes and tight tolerances.

 Typically, it is used with seals, O-rings and gaskets in automotive and aerospace applications. 

The injection molding process allows precise control of the amount of material injected into the mold, resulting in a high-quality finished product that requires minimal post-finishing.

Our  silicone rubber molding machine offers all three rubber molding processes

As you know, each rubber molding process has its own advantages and applications. 

Compression molding is ideal for producing simple shapes and small to medium-sized rubber products, 

while transfer molding is best suited for producing complex shapes and high-volume rubber products. Injection molding is recommended for producing complex shapes with tight tolerances and for high-volume production.

Ultimately, the correct silicone rubber molding process depends on product complexity, required throughput and cost considerations. Our company can help you compare all three rubber molding processes. 

We offer a full range of silicone rubber compression molding machines and rubber injection molding machines and mold solutions. We also perform thorough engineering design reviews and can provide you with assistance with rubber material selection. 

If you need to inquire, please contact: Jocelyn@japlau.com TEL&WHATSAPP: +8618603071612

Contact Us
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  • Email: Info@japlau.com
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  • WhatsApp: +86 186 0307 1612
  • Add.: DongBao Industry Zone, Sha Jing Street, Bao 'an District, ShenZhen

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