Silicone rubber holds the widest temperature range of any commercial elastomer — flexible at -60 °C, stable at 200 °C, and briefly usable to 250 °C. It is also the most biocompatible, which is why it dominates medical tubing, seals and wearables. We mould it three ways: liquid silicone rubber injection for high-volume precision parts, compression moulding for thick or low-volume sections, and extrusion for profiles and tubing.
Typical values for standard moulding grades. Exact figures depend on the specific compound or grade — confirm against your drawing before quoting.
Key properties
| プロパティ | Typical value |
|---|---|
| Hardness range | 20 – 90 Shore A |
| Service temperature | -60 to +200 °C (+250 °C short term) |
| Tensile strength | 4 – 10 MPa |
| Elongation at break | 200 – 600 % |
| Compression set (22 h / 175 °C) | 15 – 30 % |
| Dielectric strength | 20 – 30 kV/mm |
Values are typical for unfilled moulding grades at 23 °C unless stated. Glass-filled and specialty grades differ.
Typical applications
- Medical tubing, seals and septa
- Keypads and tactile buttons
- Food-contact bakeware and utensils
- Automotive connector seals and grommets
- Wearable bands and cosmetic applicators
Processing notes
- Platinum-cured grades are the default for medical and food contact. Peroxide-cured material is cheaper but leaves residues that fail biocompatibility testing.
- LSR injection suits parts under about 50 g at volume — it is fully automated and needs no post-cure. HCR compression moulding is the right call for thick sections and low quantities.
- Silicone tears easily at sharp edges. Specify a minimum radius of 0.5 mm on sealing lips and demoulding edges.
- Post-curing at 200 °C for 2 – 4 h removes volatiles and reduces compression set. Skipping it shows up as fogging in enclosed assemblies.
Frequently asked questions
What is the difference between LSR and HCR?
LSR is a two-part liquid metered and injected automatically — precise, clean, ideal for small high-volume parts. HCR is a gum stock that is milled, cut and compression or transfer moulded — better for large parts, thick sections and short runs. We run both in-house.
Can silicone be bonded to plastic or metal?
Yes, with primer-assisted bonding or mechanical interlock. For medical assemblies we prefer mechanical retention because adhesive joints are hard to validate.
Related materials
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