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Picture shows components manufactured by ENGEL with elastomer/rubber and thermoset injection molding

Elastomer/Rubber and Thermoset Injection Molding

Efficient Processing of Special Materials

When they think of plastics, most people have packaging products or caps in mind. Thermoplastics are used to produce these items. But the world of plastics offers more than just standard materials. WWith elastomer and thermoset injection moulding you can process silicone, rubber or polyester resins. ENGEL has the injection molding technology solutions for this in its portfolio.

Image shows rubber injection molding in practice
Elastomer Injection Molding
Successfully Handling Complex Requirements of Rubber/Elastomer Injection Molding

Non-thermoplastic plastics include liquid silicone rubber (LSR), solid silicone (HTV), rubber, and bulk molding compound (BMC). These materials can be processed by injection molding if the machine is designed accordingly. They have one thing in common: temperature control in the machine works differently than in thermoplastic injection molding. The material is cooled in the barrel while the mold is heated. The machine design requirements are therefore different. ENGEL has the right solution for rubber injection molding with its elast machine series.

The Following Materials can be Processed with Elastomer / Rubber Injection Molding

LSR (liquid silicone rubber) is processed using the LIM (liquid injection molding) method. The silicone is supplied as a homogeneous 2-component material. These two components are provided by special pumps.


  • The dosing system is fully integrated into the CC300 machine control.

  • The pressure conditions are monitored by pressure transducers in the feeding system.

  • The micro-injection unit enables shot weights as low as 0.3 grams.

Products: sealings, straps, switches, pacifiers, masks

Rubber is used in sealing and engine technology. There are many different types, for example ethylene propylene diene monomer rubber (EPDM) or nitrile butadiene rubber (NBR). They are all processed in the same way.


  • First in, first out (FIFO) injection units ensure high shot weights and low pressure losses.

  • The ENGEL elast machines are available as horizontal and vertical versions – for easier accessibility.

  • The easix articulated robot can be fully integrated into the production cell.

Products: sealings, insulators, dampers

Solid silicone rubbers (HTV) are high-temperature crosslinked and differ from liquid silicones in their molecular structure.


  • High melt quality because the ENGEL roto feeder (hopper) feeds the material without bubbles.

  • Multi-component injection molding is possible.

Products: sealings, insulators, electrical components

Elastomer injection molding in practice
  • Production of venting valves for beverage bottles

    Fully automatic production of vent valves made of liquid silicone on an e-victory 160, no reworking necessary.

  • Production of umbrella valves on an e-victory 120

    The production of 64 cavity umbrella valves made of liquid silicone with a part weight of just 0.06 g requires high precision and efficiency.

Are you planning to produce parts using elastomer/rubber injection molding or thermoset injection molding?

Take advantage of our expertise, machines, and technologies. We will be happy to advise you on the design of your production cell.

Picture shows thermoset injection molding (in practice)
Thermoset Injection Molding

In thermoset injection molding, components with very high mechanical properties can be manufactured. In addition, thermosets are:

  • Resilient

  • Abrasion resistant

  • Heat resistant

  • Electrically insulating

  • Chemical resistant

Our injection molding machines can deal with the special properties of thermosets in injection molding. We offer wear-resistant and flexible systems for these challenging materials.

The Following Materials can be Processed with Thermoset Injection Molding

Pellet-based molding compounds and wet polyesters (bulk molding compounds; BMC) are usually reinforced with various fillers. These are, for example, minerals, glass or even carbon fiber. This provides them with high mechanical properties .


  • The ENGEL roto feeder (hopper) supplies the BMC material.

  • High-quality material designs for the plasticizing units.

  • ENGEL offers additional products such as universal injection compression and venting programs, wear-resistant plasticizing units, temperature-controlled nozzles, and corresponding peripheral equipment.

Products: housings, switches, lamps, electronic components, gear parts

Discover More Injection Molding Processes for your Plastics Production

Over 20 proven injection molding processes for greater cost-efficiency and different applications

Image shows the surface finishing of a plastic part by ENGEL

Surface Finishing and Functionalized Plastic Parts

Injection molding process for sophisticated component designs with additional integration of functions

Image shows transparent component by ENGEL

Optical and Transparent Components

Injection-molded components made of transparent plastics with outstanding clarity

Picture shows lightweight plastic component by ENGEL

Weight and Warpage Reduction

Injection molding process for lightweight plastic components to reduce weight and warpage of your plastic parts

Picture shows plastic parts manufactured by precision injection molding

Precision Injection Molding

For more accurate geometries, better surface quality and low component weight

Picture shows recycled material

Injection molding process for recycled materials

More safety and consistently high product quality despite recycled material.

Image shows plastic parts manufactured by ENGEL using injection molding processes

Overview of all injection moulding processes

Over 20 Proven Injection Molding Technologies for More Profitability

Markus Lettau

Molding Industry Business Advisor

+1 (717) 767 2016

Write us

The ENGEL team is happy to support you with extensive knowledge in the field of injection molding.

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