Liquid Silicone Rubber (LSR) Injection Molding: Capabilities, Applications & OEM Services | WQ Silicone
Liquid Silicone Rubber (LSR) is the most advanced silicone manufacturing technology available today — and one of the most demanding to execute correctly. Unlike solid silicone compression molding, LSR injection molding produces parts with superior precision, consistency, and performance characteristics that no other elastomer process can match.
At WQ Silicone, we operate dedicated LSR injection molding lines alongside our solid silicone production, giving clients access to the full spectrum of silicone manufacturing — from high-volume kitchenware to medical-grade components — under one roof.
LSR vs. Solid Silicone: Which Do You Need?
| Factor | LSR Injection Molding | Solid Silicone Compression |
|---|---|---|
| Precision | ±0.05mm | ±0.1–0.3mm |
| Cycle time | 15–60 seconds | 3–10 minutes |
| Flash / waste | Minimal | Flash trimming required |
| Best for | Medical, precision baby, complex geometry | Kitchenware, gifts, pet products |
| MOQ | 1,000–5,000 pcs | From 500 pcs |
WQ Silicone LSR Capabilities
Equipment: 50T–200T LSR injection machines, automated A:B metering, cold runner / valve gate tooling
Hardness range: Shore A 10–80
Temperature range: -60°C to 260°C
Food-grade LSR: FDA 21 CFR 177.2600 + LFGB certified — baby nipples, bottle seals, feeding accessories
Medical-grade LSR: ISO 10993 biocompatibility — catheter components, wearable device seals
Optical LSR: >90% light transmission — LED diffusers, optical lenses
Typical LSR Applications
Baby & infant: bottle nipples, pacifier shields, teether inserts, nasal aspirator tips
Medical: respiratory mask seals, catheter components, hearing aid domes
Food contact: collapsible cup seals, pouch spouts, filter parts
Automotive: connector seals, grommet inserts, under-hood gaskets
Electronics: keyboard membranes, waterproof seals, button covers
LSR OEM Development Process
DFM Review (3–5 days): LSR engineers analyze your 3D file for wall thickness, gate location, parting line — written report before tooling begins
Mold Development (15–25 days): Hardened steel (P20/H13) cold runner mold, zero waste injection
T1 Sample (7–10 days): Full dimensional report + hardness + visual inspection
Compliance Testing: SGS / third-party FDA / LFGB / ISO 10993 coordination available
Mass Production: Automated LSR injection, 99%+ yield rate for established molds
Request a Free LSR DFM Review
Send us your 3D file or product sketch — we'll provide a free DFM review and manufacturing feasibility assessment within 3 business days, at no charge.
📧 sale18@siliconesupplier.com | 📞 +86 135-5473-9449
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