LSR Overmolded LED Light Guide Column

LSR Overmolded LED Light Guide Column is a precision composite optical component designed to optimize light transmission and structural protection for LED lighting systems. Manufactured by 橡楚（湖北）橡胶有限公司 at our facility in 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, this component combines a rigid optical core (typically polycarbonate (PC) or polymethyl methacrylate (PMMA)) with a liquid silicone rubber (LSR) overmolded outer layer to deliver balanced optical performance, mechanical stability, and environmental resistance.

Unlike traditional uncoated light guide columns or assemblies assembled with separate rubber gaskets, our overmolded design integrates the sealing and cushioning functions directly into the component through precision liquid injection molding. This eliminates assembly gaps, reduces light leakage, and simplifies downstream production processes for LED equipment manufacturers. Our core selling points include consistent optical clarity, reliable long-term sealing performance, custom mold design for unique application requirements, and strict quality control aligned with international production standards.

Technical Specifications

Material Properties

Physical Performance

Process Parameters

Our LSR overmolding process follows controlled production parameters to ensure consistent product quality:

• Injection Molding Temperature: 140°C – 170°C
• Curing Time: 30s – 90s (adjusted by component thickness)
• Molding Pressure: 5 – 15 MPa
• Post-Curing: 4h at 120°C to eliminate residual volatile compounds
• Core Pre-Treatment: Plasma surface activation to improve LSR-core bonding strength

Product Advantages

1. Integrated Sealing and Optical Performance

The overmolded LSR layer acts as both a light diffuser (when adjusted) and a waterproof sealing gasket, eliminating the need for separate gaskets in LED assembly. This reduces part count, cuts assembly labor costs, and minimizes the risk of light leakage or water intrusion caused by misaligned separate components. The uniform LSR layer provides consistent light diffusion for even, glare-free illumination across the entire output surface.

1. Excellent Long-Term Environmental Resistance

LSR inherently resists UV degradation, ozone, moisture, and extreme temperature cycling. Unlike thermoplastic overmolding materials, LSR does not become brittle or crack after years of outdoor exposure, maintaining its sealing and mechanical cushioning performance. This extends the service life of the entire LED assembly, reducing long-term maintenance and replacement costs for end users.

1. Customizable Design and Precision Molding

We offer fully custom mold development for LSR overmolded LED light guide columns to match unique size, shape, hardness, and optical requirements. Our precision injection molding process achieves tight dimensional tolerances, ensuring consistent fit and performance for high-volume production. We can adjust LSR transparency, hardness, and color to meet specific optical and mechanical requirements for different applications.

1. High Adhesion Reliability

Our optimized plasma pre-treatment and LSR formulation create strong, permanent bonding between the LSR overmold and the optical core. The bond does not delaminate even under repeated thermal cycling or prolonged immersion in water, eliminating common failure points of assembled or bonded light guide components.

Applications

LSR Overmolded LED Light Guide Columns are used across a wide range of LED lighting and indication applications, including:

• Outdoor LED Lighting: Street lamps, landscape lighting, architectural facade lighting, and solar-powered outdoor lights. The IP67-rated overmolded seal protects internal LED components from moisture, dust, and insect intrusion, maintaining stable light output in harsh outdoor environments.
• Automotive Lighting and Indicators: Dashboard indicator lights, door handle ambient lighting, taillight auxiliary light guides, and exterior puddle lights. The LSR overmold withstands the wide temperature fluctuations and vibration common in automotive environments, while providing glare-free uniform illumination for indicators.
• Industrial LED Equipment: Machine tool status indicators, control panel signal lights, outdoor industrial sensor lighting, and explosion-proof LED fixtures. The LSR material meets flame retardancy requirements and provides electrical insulation, improving the safety and reliability of industrial equipment.
• Consumer Electronics: Smart home device indicator lights, portable outdoor lighting, and wearable device LED indicators. The soft LSR overmold provides a comfortable tactile surface while improving water resistance for portable devices.
• Medical Equipment: Medical device status indicators and surgical lighting auxiliary light guides. Our medical-grade LSR meets low-volatility and biocompatibility requirements for use in clinical and medical device environments.

Selection Guide

Hardness Selection

• 30 Shore A – 40 Shore A: Recommended for applications requiring high compression sealing performance, such as outdoor junction box integrated light guides, where high elasticity accommodates minor assembly misalignments.
• 40 Shore A – 60 Shore A: General purpose grade for most LED indicator and lighting applications, balancing sealing performance and structural stability.
• 60 Shore A – 70 Shore A: Recommended for applications requiring high structural rigidity and wear resistance, such as frequently touched button-integrated light guides.

Size Specifications

We support custom sizes ranging from 3mm diameter small indicator light guides to 200mm length large light guide columns for architectural lighting. Dimensional tolerances can be adjusted based on application requirements: we offer ±0.05mm precision tolerances for high-precision assembly applications, and ±0.1mm tolerances for general purpose applications to optimize production costs.

Material Grade

• Industrial Grade LSR: Suitable for general industrial, consumer electronics, and automotive applications that do not require biocompatibility. This grade offers an ideal balance of performance and cost.
• Medical/Food Grade LSR: Suitable for medical devices, food processing equipment lighting, and other applications that require low toxicity and low volatile content. All our LSR materials are free of phthalates and harmful heavy metals, meeting global environmental regulatory requirements.
• Diffuse/Transparent Grades: Select high-transparency LSR for applications requiring maximum light output, or semi-transparent diffuse LSR for applications requiring even, glare-free light output.

Quality Assurance

At 橡楚（湖北）橡胶有限公司, we operate our production system under the ISO 9001 quality management standard, implementing strict quality control at every stage from raw material incoming inspection to final product shipment. Each batch of raw material is tested for hardness, light transmittance, and mechanical properties before entering production. We conduct 100% dimensional inspection and optical consistency inspection for finished products, and perform adhesion and compression set testing on a sampling basis to ensure compliance with specification requirements.

We are committed to delivering consistent, high-quality LSR overmolded components that meet customer performance requirements. For custom orders, we provide pre-production sample confirmation and first article inspection reports to ensure alignment with customer design requirements before full-scale production.

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*For inquiries about custom specifications or pricing, contact us at:*

Phone: +86 18071171144 | Email: churubber@163.com

Address: No. 54, Neihe Lane, Fankou Street, Economic Development Zone, Echeng District, Ezhou City, Hubei Province, China