Overview
Light diffusing PC is a modified polycarbonate incorporating microscopic diffusion particles (e.g., silica or acrylic beads) that scatter light while maintaining high transparency. Developed in the 2000s for LED lighting applications, it solves the 'dotting effect' in point light sources by creating uniform illumination. The material retains polycarbonate's core advantages—impact resistance (250× that of glass) and thermal stability—while adding optical control capabilities through proprietary additive technologies. Major global suppliers include Covestro (formerly Bayer MaterialScience), SABIC, and Mitsubishi Engineering-Plastics, with regional producers in China and South Korea offering cost-competitive alternatives. The material is typically supplied as injection molding pellets or extruded sheets in thicknesses of 0.5–10mm for different applications.
Physical and Chemical Properties
The light diffusion effect is quantified by haze percentage (70–90% for most applications) and total luminous transmittance (typically 85–92%). Unlike frosted surfaces that reduce clarity, diffusion PC maintains see-through capability while eliminating glare—achieved through precise control of particle size (usually 2–20μm) and dispersion density. Thermally, it withstands continuous use at 90–120°C, with short-term tolerance up to 135°C, making it suitable for high-power LED applications. The base polycarbonate provides inherent flame retardancy (UL94 V-0 rating without additives) and exhibits low moisture absorption (<0.3% at 23°C/50% RH). Chemical resistance includes alcohols and weak acids but avoids prolonged contact with strong alkalis or aromatic hydrocarbons.
Main Applications
In LED lighting (60% of usage), diffusion PC is the material of choice for bulb covers, panel lights, and streetlight globes—replacing traditional opal glass with 50% weight reduction and superior impact resistance. For backlight units in TVs and monitors (25% share), it enables slim designs (<5mm thickness) with consistent brightness across large areas. Automotive applications include interior ambient lighting (dashboards, door handles) and exterior light guides, where its weatherability outperforms PMMA. Emerging uses include 3D printing filaments for light pipes and medical device housings requiring sterilization compatibility. In architectural contexts, it serves as daylighting panels that diffuse sunlight while blocking UV radiation.
Safety and Storage
As a thermoplastic, processing requires standard polymer safety measures: adequate ventilation during injection molding (200–300°C barrel temperatures) to prevent trace monomer release. Finished products are food-contact safe (FDA compliant grades available) and non-halogenated for eco-sensitive applications. Raw pellets must be dried (120°C for 3–4 hours) before processing to prevent hydrolysis degradation. Storage recommendations include moisture-proof packaging with desiccants and palletized stacking to prevent compression deformation. Shelf life is typically 12 months in original packaging, though reprocessing is possible with proper drying if material absorbs moisture.
B2B Procurement Guide
Industrial buyers should specify: 1. Optical requirements (haze %, transmittance) 2. Thermal specs (Vicat softening point, RTI) 3. Regulatory compliance (RoHS, REACH, UL) 4. Processing method (injection molding, extrusion) MOQs for standard grades start at 500kg, with lead times of 2–4 weeks for custom formulations. Asian suppliers offer cost savings (20–30% lower than EU/US producers) but may lack proprietary diffusion technologies. For lighting applications, verify blue light resistance testing data—premium grades maintain stability after 10,000 hours of 450nm LED exposure. Sample testing should include real-condition light diffusion evaluation, as lab measurements may not reflect actual installation performance.
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