PMMA, Polycarbonate and Polystyrene: Material Guide for LED Diffusers and Optical Sheets

A complete technical comparison of PMMA, polycarbonate (PC), and polystyrene (PS) for LED diffusers and optical sheets. Covers optical transmittance, impact resistance, fire ratings, UV stability, thermal behaviour, and application-by-application guidance to help engineers and buyers specify the right material first time.

TP(a) Fire Ratings for Prismatic Diffusers: PC and PS Compared

Both Polycarbonate and Polystyrene prismatic diffusers can achieve TP(a) rigid fire classification under UK Building Regulations Approved Document B. See our SGS-certified test results and learn what TP(a) means when specifying UGR<19 lighting for commercial, educational, and public spaces.