Optical-grade PMMA is a high-end category in the PMMA product family, produced using high-purity MMA monomer and continuous bulk polymerization process, with strict control of impurities, yellowing index, and birefringence. It features ultra-high light transmittance (≥93%), low haze (≤0.5%), and excellent refractive index uniformity (Δn<0.0002).
Abrasion-Resistant / Scratch-Resistant PMMA
Abrasion-resistant/scratch-resistant PMMA is produced by applying a hard coat (such as silicon-based, acrylic UV-curable coating, or nano-ceramic coating) on the PMMA substrate surface, or by co-extrusion to form a wear-resistant layer on the PMMA surface. Surface pencil hardness can reach 2H~4H (vs. HB~1H for untreated PMMA), with abrasion resistance improved 5~10×.
Glass fiber reinforced PMMA is produced by incorporating short-cut glass fibers (typically 10%~30% content) into the PMMA matrix. The addition of glass fibers significantly improves tensile strength, flexural modulus, heat resistance, and dimensional stability. Flexural modulus can reach 6000~9000 MPa, and HDT can reach 110~130°C, but transparency is reduced, resulting in translucent or opaque appearance.
Flame-retardant grade PMMA incorporates halogen-free flame retardants (organic phosphorus-based, silicon-based, etc.) or reactive flame-retardant monomers to achieve UL94 V-2 to V-0 ratings, with some high-end products reaching 5VA level. This series maintains high light transmittance (≥88%) while meeting fire safety regulations for rail transit, construction, and electrical appliances.
Heat-resistant grade PMMA is produced by copolymerizing heat-resistant monomers (such as maleic anhydride MAH, cyclohexyl methacrylate CHMA, etc.) or adding heat-resistant fillers, raising the heat deflection temperature to 105~130°C, with some high-end grades reaching 140°C.
High impact modified PMMA is produced by blending or graft copolymerizing elastomers (such as butadiene-based rubber, acrylic elastomers, or TPU) into the MMA matrix. Its core objective is to substantially improve impact resistance while maintaining PMMA's excellent transparency.
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