What Is The Process Of An LSR Injection Molding?

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Silicone products are a relatively common product in our life. Compared with plastic, silicone is more stable and environmentally friendly. It is widely used in mother and child products, such as baby pacifiers, children’s toys, silicone phone cases, watch bands, oxygen masks, etc.

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What is LSR in manufacturing?

Liquid silicone rubber (LSR) has become the material of choice for manufacturing silicone parts and products. The distinctive qualities of liquid silicone rubber injection molding differ from molding high-consistency rubber (HCR) and thermoplastic injection molding processes. LSR is a Thermo-Set material, meaning that heat is required to ‘cure’ the material by cross-linking  polymer chains. The injection moulding of LSR involves mixing the two-component compound together, which is then heat-cured in the mould with a platinum catalyst to produce a finished LSR part.

How is an injection mold made?

Injection molds, which are usually made from steel, contain cavities that will form the parts. Melted plastic is injected into the mold, filling the cavities. The mold is cooled, and the parts are ejected by pins.

What are the 5 steps of injection moulding?

Major stages of injection molding

  1. Making a mold. …
  2. Install the mold in a specific machine: the injection molding machine. …
  3. Inject the softened plastic materials under high pressure under the effect of heat in the mold. 
  4. Cooling of the whole through cooling channels within the mold. …
  5. Eject the part.
  6. Repeat with the next part.

What Is The Process Of An LSR Injection Molding?

It starts out as a fluid and is then heated within the mold to initiate curing. Once it hardens, the molding machine ejects the nearly finished part. Thermoplastics operate in reverse; the materials are heated in the injection barrel to their melting point and then cooled in the mold.

The Advantages of LSR Moulding

  1. LSR is particularly popular for products for the medical and automotive industries, due to its good physical properties that include:
  2. A wide temperature range
  3. Very good temperature stability and resistance
  4. Excellent physiological/Hypoallergenic properties
  5. Good ageing and weather resistance
  6. Low viscosity that allows the material to flow easily into thin and complex areas of the mould
  7. Suitable for high volume production
  8. Short cycle times compared to compression moulding


Silicone is an environmentally friendly material. Because of its good performance has been favored, accepted, and widely used by various industries to produce various individually shaped products.

In Todsilicone, We offer OEM manufacturing service of silicone injection molding and overmolding products for global brand customers. Helping customers achieve value is our aim from concept design, prototype sample, tooling development, mass production to final shipment.

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