High Transparency LSR Silicone Rubber
Silico® High Transparency LSR is a platinum-cured, ultra-clear silicone for optical parts. It offers >94% transmittance, low haze, and UV resistance—ideal for LEDs, light guides, and medical optics.
Product Overview
Silico® High Transparency LSR is a platinum-cured, ultra-clear liquid silicone rubber designed for optical-grade applications requiring exceptional light transmittance, low haze, and long-term clarity. Engineered for liquid injection molding (LIM), this advanced material combines excellent mechanical properties, UV resistance, and dimensional stability, making it ideal for use in LED optics, light guides, wearable optics, and medical imaging components.
With a refractive index comparable to glass and a transmittance above 94%, Silico® High Transparency LSR enables precision molding of complex, micro-featured optical parts without compromising clarity or performance.Key Technical Specifications
| Property | Typical Value |
|---|---|
| Appearance | Crystal clear, translucent |
| Mixing Ratio (A:B) | 1:1 (by weight) |
| Viscosity (mixed, @25 °C) | 13,000–50,000 mPa·s |
| Shore A Hardness | 20–80 (available in multiple grades) |
| Light Transmittance (@2 mm) | ≥ 94% |
| Haze | < 1% |
| Refractive Index (nD25) | ~1.41 |
| Tensile Strength | 4–7 MPa |
| Elongation at Break | 250–400% |
| Tear Strength | ≥ 12 kN/m |
| Compression Set (22h/175 °C) | ≤25% |
| Operating Temperature | –55 °C to +200 °C (short-term up to +230 °C) |
| UV / Weather Resistance | Excellent (no yellowing) |
- All properties are typical values. Custom formulations are available upon request.
Key Features & Certifications
-
High Optical Clarity:
≥ 94% light transmittance (at 2mm), haze < 1%, refractive index ~1.41 -
Platinum-Cured System:
No residual by-products, low VOC, and superior thermal and chemical resistance -
Long-Term Stability:
Excellent UV, ozone, and yellowing resistance over prolonged use -
Mechanical Reliability:
High tear strength, low compression set, and wide hardness range -
Certified for Precision Applications:
Meets RoHS, REACH, and food-contact safety upon request
Applications
Silico® High Transparency LSR is designed for high-precision, light-sensitive, or aesthetic-critical applications, including:
LED Lighting: Lenses, optical diffusers, reflectors, and light guides
Consumer Electronics: Optical sensors, touchpad overmolds, display lenses
Wearables: Light pipes, translucent housings, and smart device optics
Medical Devices: Endoscope light windows, diagnostic optics, imaging covers
Automotive: Adaptive lighting lenses, interior illumination components
Industrial Optics: Fiber optic connectors, prisms, protective transparent seals
Processing Information
Silico® High Transparency LSR is optimized for flash-free, high-volume LIM:
-
Mixing Ratio: 1:1 (Part A and B)
-
Injection Unit Temp: 15–25 °C (cooled barrel recommended)
-
Mold Temp: 150–180 °C (for high clarity)
-
Cycle Time: 10–60 seconds depending on part geometry
-
Mold Surface Finish: Mirror-polished (SPI-A2) for optical-grade parts
-
Post-Curing: Optional for enhanced thermal/optical stability (2h @ 150–200 °C)
Advantages of Silico® Optical-Grade LSR
✅ Glass-like Transparency for light-critical applications
✅ Superior UV & Thermal Resistance with long-term clarity
✅ Design Flexibility: Suitable for micro lenses, overmolding, and hybrid parts
✅ Fast Processing: Short cycle time, low flash, minimal waste
✅ Excellent Mechanical Stability under temperature variation and mechanical stress
✅ Customizable Grades: Hardness, flowability, refractive index, color matching
Packaging & Storage
Standard Packaging:
▪ 20 kg kits (10 kg A + 10 kg B)
▪ 200 kg drums
▪ 1000 kg IBCs for high-volume usersShelf Life: 12 months in sealed packaging at 5–25 °C
Storage Conditions: Store in a dry, clean environment, away from heat and UV light
Silico® offers comprehensive TDS, MSDS, compliance documents, and customization services for high transparency LSR silicone rubber. Free samples are available for qualified OEMs.
📩 Contact us today for technical data sheets (TDS), safety data sheets (SDS), samples, or custom formulation support.
Jessica G.
Get in touch to Get
- Quick and helpful reply within 8 hours;
- Tailored solutions provided for your project;
- One-stop purchasing service.
Recommended LSR Silicone Rubber Products
Industrial Grade LSR Silicone Rubber
Medical Grade LSR Silicone Rubber
Food Grade LSR Silicone Rubber
