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Home » Blogs » Blogs » Silicone Vs. Liquid Silicone Rubber (LSR) – Key Differences And Applications

Silicone Vs. Liquid Silicone Rubber (LSR) – Key Differences And Applications

Views: 0     Author: Site Editor     Publish Time: 2025-07-11      Origin: Site

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1. Form and Processing

Silicone Rubber (Solid Silicone)

  • Form: Solid or semi-solid (sheets, pellets, or molded parts).

  • Processing:

    • Compression Molding: Heated and pressed into shape.

    • Extrusion: For tubes, seals, and profiles.

  • Curing: Requires heat and pressure, slower cycle times.

Liquid Silicone Rubber (LSR)

  • Form: Low-viscosity liquid (two-part system: A+B components).

  • Processing:

    • Injection Molding: Mixed and injected into molds, curing rapidly (seconds to minutes).

  • Advantages: High precision, excellent for complex geometries.


2. Key Properties Comparison

PropertySilicone RubberLiquid Silicone Rubber (LSR)
HardnessShore A 10-80 (adjustable)Softer, more elastic (Shore A 5-50)
TransparencyGood (can be opaque/clear)Higher clarity (optical uses)
Heat Resistance-60°C to 250°C-50°C to 200°C (suits most needs)
Tear StrengthModerateExcellent (flexible & durable)
BiocompatibilityGeneral useMedical/food-grade (FDA, USP Class VI)

3. Common Applications

Silicone Rubber

  • Kitchenware (baking molds, spatulas)

  • Industrial seals, gaskets

  • Keypads, remote buttons

Liquid Silicone Rubber (LSR)

  • Medical: Baby nipples, implants, respiratory masks

  • Electronics: Waterproof seals (smartwatches), connectors

  • Precision Parts: Optical lenses, micro-valves


4. Cost & Production Efficiency

  • Silicone Rubber: Lower material cost, slower production (labor-intensive).

  • LSR: Higher tooling cost, but faster cycles (ideal for mass production).


Conclusion: Which One to Choose?

  • Use Silicone Rubber for cost-effective, simple-shaped, or high-durability parts.

  • Choose LSR for complex designs, medical safety, or high-volume precision components.

Need help selecting the right silicone material? Consult with a specialist based on your project’s requirements!


Yixun is the China first generation mold maker, specialize in mold and moulding, provide one-stop plastic manufacturing service, feature in building medical and healthcare device tooling.
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