Liquid Silicone Rubber (LSR) Injection Molding
300K-class cleanroom LSR injection for medical, automotive, optical and consumer applications. In-house cold-runner valve-gate molds, automated inspection, full digital traceability.
Purpose-Built LSR Department, Not Converted Plastic Lines.
Our LSR department runs dedicated Haitian LSR injection machines with liquid A/B component dosing, vacuum-assisted cold-runner molds, and inline vision inspection. Temperature- and humidity-controlled throughout.
- Vertical & horizontal LSR machines, 50–300 ton
- In-house cold-runner valve-gate mold design & build
- 300K-class cleanroom for medical & optical LSR
- Automatic dosing, mixing, inspection, packaging
- Full MES traceability from compound to ship
Capability
Technical Specifications
| Machine Tonnage | 50 – 300 ton (vertical & horizontal) |
|---|---|
| Cleanroom Class | 300K (ISO 8 equivalent) for medical / optical LSR |
| Shot Weight Range | 0.1 g – 500 g |
| Tolerance | ±0.05 mm (typical), ±0.02 mm (precision parts) |
| Mold Type | Cold-runner, valve-gate, in-house design & build |
| Materials | LSR (5–80 Shore A), optical LSR (RI 1.43–1.46), medical-grade, self-adhesive, oil-bleeding, fluorosilicone |
| Overmolding | LSR on thermoplastic (PC, PA, PBT), metal insert overmolding |
| Post-Processing | Post-cure, deflashing, laser marking, plasma treatment, assembly |
| Quality | CMM, 2.0/2.5 projector, 100% vision inspection for critical dimensions |
| Certifications | ISO 9001 · ISO 13485 · IATF 16949 · FDA · LFGB · ROHS · REACH |
Process
From DFM to Ship in Four Steps
DFM & Quote
Send drawing (STEP / IGES / PDF). DFM feedback and formal quote within 24 hours.
Mold Build
In-house cold-runner valve-gate mold, T1 samples in 15–25 days depending on complexity.
Mass Production
300K cleanroom injection, automated inspection, full MES traceability per batch.
QC & Ship
CMM + vision + manual QC. FAI / PPAP / CoC reports available. World-wide logistics.
Applications
Where Our LSR Parts Ship
Inside the Department
Shop Floor Gallery
FAQ
Frequently Asked Questions
What is liquid silicone rubber (LSR) molding?
LSR is a two-component platinum-cured silicone injected as a liquid into a heated mold, where it vulcanizes in seconds. Compared with solid silicone (HCR) compression molding, it gives tighter tolerances, near-zero flash, full automation and lower per-part cost at volume.
LSR vs HCR — which should I choose?
Choose LSR for precision parts, thin walls, high volumes and medical/optical use. Choose HCR (compression molding) for very large parts, low volumes or when an existing tool already exists.
Can you overmold LSR onto plastic or metal?
Yes. Self-adhesive LSR grades bond directly to PA, PBT, PC and PPS without primer. For other substrates we use primer or mechanical interlocks. Send us your substrate material and we recommend the grade.
What is the mold lead time?
Standard single-cavity or multi-cavity cold-runner molds: 15-25 days to T1 samples. Complex multi-material molds: 25-35 days.
What is the MOQ and how do you quote?
No fixed MOQ — we quote per part. Send a STEP/IGES/PDF drawing; DFM feedback and formal quote within 24 hours.
Which reports do you provide?
FAI (full dimensional), PPAP, material CoC, and per-batch MES traceability. Medical parts ship with lot-level curing and inspection records.
Ready to Start?
Send Your Drawing. Get DFM in 24 Hours.
Our engineers will review your part and come back with a quote, mold plan and lead time — no commitment required.