LSR molding.
Two-part silicone.
Medical-grade.
Liquid Silicone Rubber (LSR) injection molding — two-part platinum-cured silicone. High-performance elastomer for medical devices, automotive seals, baby products.
Key principles.
Two-part injection
Two liquid components mixed in machine, injected into heated mold.
Heat-cured
Mold heated to 170-200°C. Cures in seconds.
High-performance silicone
Hardness 5-90 Shore A. Temperature -50 to +200°C.
USP Class VI
USP VI silicone grades for implants, drug-contact.
Fast
Faster than rubber compression molding. 30-60 second cycles.
Premium
LSR material premium ($15-30/kg). Tooling $20-100K. Per-piece cost low at volume.
FAQ
LSR vs HCR (high-consistency rubber)?
LSR: liquid before molding, faster cycle, higher precision. HCR: gum-stock, compression-molded, lower tooling cost.
Major applications?
Medical (catheter components, masks), automotive (gaskets, seals), baby products (pacifiers, bottles).
Hardness range?
5 Shore A (very soft) to 90 Shore A (firm). Wider range than thermoplastic elastomers.
Optical clarity?
Optical-grade LSR clear. Used in LED lenses, optical applications.
FDA / biocompatibility?
USP Class VI grades standard for medical. FDA-approved for direct food/skin contact.
Production volumes?
5K+ pieces economical with steel mold. Higher volumes (50K+) drive per-piece cost low.
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