Liquid Silicone Rubber

Liquid silicone rubber moulding is a thermoset process that mixes a two-component compound together, which is then heat cured in the mould with a platinum catalyst to produce a final LSR part.


We offer a number of secondary moulds and tooling services to support your project.

How It Works

Due to the flexible nature of LSR, parts are manually removed from the mould, and thus, ejector pins are not built into the mould design. Like a standard aluminium tool, an LSR moulding tool is fabricated using CNC machining to create a high-temperature tool built to withstand the LSR moulding process. After milling, the tool is polished by hand to customer specifications, which allows six standard surface finish options.

The finished tool is loaded into an advanced LSR-specific injection moulding press that is precision geared for accurate control of shot size to produce the most consistent LSR parts.

Since LSR is a thermosetting polymer, its moulded state is permanent—once it is set, it can’t be melted again like a thermoplastic. When the run is complete, parts (or the initial sample run) are boxed and shipped shortly thereafter.


Injection moulding icon

25 to 10,000+

Shipped in 15 days or less


Best for:
  • on-demand parts
  • low-volume production
  • bridge tooling
  • pilot runs
  • functional prototyping

LSR Materials

We stock a range of LSR materials that are suitable for various part applications and industries. Choose from standard silicones in multiple durometers along with optical-, medical-, and fuel-resistant grades.



Design Guidelines

Our basic guidelines for LSR moulding include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time.



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