Optical Silicone LSR Injection Molding
RI 1.43–1.46, 84+ Shore A optical-grade LSR for LED lenses, light guides and automotive optics. Direct replacement for Dow / Wacker grades — up to 40% lower cost.
Clarity You Can Measure. Cost You Can Feel.
Our optical LSR matches the refractive index and light transmission of Dow Corning and Wacker grades, while cutting material cost by up to 40%. 300K cleanroom injection ensures defect-free optical surfaces.
- Refractive index 1.43 – 1.46
- Shore A 84+ for structural optical parts
- Light transmission ≥ 94%
- Yellowing resistance ≥ 2000 h @ 150°C
- Direct Dow / Wacker grade cross-reference
Capability
Technical Specifications
| Refractive Index | 1.43 – 1.46 (multiple grades) |
|---|---|
| Hardness | Shore A 60 – 84+ |
| Light Transmission | ≥ 94% (400–800 nm) |
| Heat Resistance | -40°C to +200°C continuous |
| Yellowing | ≥ 2000 h @ 150°C (QUV / xenon tested) |
| Cleanroom | 300K class for optical surface control |
| Applications | LED lens, light guide, automotive DRL / headlamp, sensor window |
| Cross-reference | Direct equivalent to Dow / Wacker / Momentive optical grades |
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
Material Guide
Optical Silicone vs PMMA / PC
| Continuous Service Temp | -60°C to +200°C |
|---|---|
| UV Resistance | Excellent (no yellowing) |
| Yellowing Index (1000h UV) | ΔYI < 1 |
| LED Junction Compatibility | Yes (150-200°C) |
| Impact Resistance | Moderate |
| Refractive Index | 1.43 – 1.46 |
| Typical LED Lens Life | 50,000h+ |
Why it matters: LED junctions run 150-200°C. PMMA softens, PC yellows — silicone keeps clarity for the life of the luminaire.
FAQ
Frequently Asked Questions
Why silicone instead of PMMA/PC for LED lenses?
LED junctions run at 150-200°C where PMMA softens and PC yellows. Optical silicone survives the heat, keeps >95% transmittance for 50,000+ hours, and never yellows under UV — the reason automotive and street-lighting OEMs specify silicone lenses.
What refractive index grades do you mold?
RI 1.43-1.46 optical grades, transparency ≥ 95% @ 1mm. Higher-RI grades available for narrower beam angles on request.
Can you overmold silicone optics onto LED PCBs or housings?
Yes — LSR overmolding directly onto metal-core PCBs, PC reflectors or aluminum heat sinks is a core capability. This eliminates assembly steps and improves IP sealing.
What surface quality can you achieve?
Optical-grade polish on mold cavities (SPI A1/A2 equivalent). No flow marks on lens surface with cold-runner valve-gate tooling; parting line controlled to ≤ 0.05 mm.
Which industries use your optical silicone?
Automotive lighting (headlamps, DRL, rear lamps), street and industrial LED lighting, horticultural lighting, medical/specialty optics, and consumer lighting.
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.