MOLDITQUICK

Case Study

Medical ECG Button via LSR Liquid Silicone Molding

LSR molding differs from thermoplastics: it is a two-part platinum-cure liquid injected into a heated mold, then vulcanized in seconds. Benefits: elastic recovery, wide temp range, inert and skin-safe. We pair LSR with thermoplastic molding and CNC for the rigid…

Industry
Medical / Wearable
Process
Liquid Silicone Rubber (LSR) Molding
Material
LSR (medical grade)
Tolerance
±0.03mm
Surface
Skin-safe matte
Volume
300K units / year
Lead Time
7 weeks (rapid tooling)

The Challenge

A wearable ECG monitor needed a soft, skin-safe button with tactile feel and repeated-press reliability. The client required cleanroom-compatible molding and biocompatible material with no leachables.

Our Solution

We qualified medical-grade LSR, designed a cold-runner mold for flash-free parts, and validated venting to avoid air traps in the thin button wall. Tight tolerance held the snap feel across 300K annual cycles; clean production met device documentation needs.

LSR molding differs from thermoplastics: it is a two-part platinum-cure liquid injected into a heated mold, then vulcanized in seconds. Benefits: elastic recovery, wide temp range, inert and skin-safe. We pair LSR with thermoplastic molding and CNC for the rigid housing around it.

Why LSR for medical buttons

Property Benefit
Elastic recovery Millions of press cycles
Biocompatible Skin contact safe
Flash-free (cold runner) No post-trim, clean
Temp stable Autoclave-adjacent use

FAQ

LSR vs TPE? LSR cures to a true elastomer with better recovery and heat resistance; TPE is a thermoplastic blend, easier but lower ceiling.

From this button to the rigid housing — one shop, clean process.

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