Polymethyl Methacrylate[4]
Overview
Polymethyl methacrylate (PMMA), commercially known as acrylic or organic glass, is a synthetic polymer of methyl methacrylate. First developed in 1928, it combines glass-like clarity with superior impact resistance. As the most commonly used acrylic plastic, PMMA accounts for approximately 30% of the global transparent plastics market. Unlike mineral glass, PMMA is lightweight (about half the density of glass) and can be easily thermoformed. Its optical clarity (92% light transmission) and weatherability make it indispensable for applications where glass is impractical. The material is produced through bulk or suspension polymerization processes.
Physical and Chemical Properties
PMMA exhibits outstanding optical properties with a refractive index of 1.49, comparable to crown glass. Its surface hardness ranges between 80-100 Rockwell M scale, providing good scratch resistance. The material has a tensile strength of 50-77 MPa and elongates 2-10% before breaking. Chemically, PMMA resists dilute acids and alkalis but is attacked by strong solvents like acetone. It has excellent UV stability when properly formulated, with less than 3% yellowness index change after 10 years outdoor exposure. The thermal expansion coefficient is 5-9×10⁻⁵/°C, requiring consideration in structural designs.
Main Applications
The construction industry consumes about 40% of PMMA production for skylights, noise barriers, and safety glazing. Extruded sheets dominate this sector due to cost efficiency. In automotive applications, PMMA appears in tail lights, instrument panels, and increasingly in panoramic sunroofs where its lightweight offsets battery weight in EVs. Display industries utilize cast PMMA for museum showcases and retail fixtures where optical perfection is critical. The medical field employs PMMA in bone cement and dental prosthetics. Emerging applications include microfluidic devices and light guides for fiber optics.
Safety and Storage
PMMA is generally non-hazardous under normal conditions, classified as non-flammable (auto-ignition temperature 460°C). However, machining generates dust requiring NIOSH-approved particulate respirators. Proper ventilation should maintain airborne concentrations below 5 mg/m³. Storage recommendations include keeping sheets flat on edge at 15-25°C with relative humidity below 60%. Protective film should remain on sheets until fabrication to prevent surface scratching. Bulk pellets require protection from moisture absorption which can cause processing defects.
B2B Procurement Guide
Industrial buyers should specify between cast (higher molecular weight) and extruded (better dimensional stability) grades. UV-stabilized formulations typically contain 1-3% additives like benzophenones for outdoor use. Anti-static coatings may be necessary for electronic applications. Standard sheet sizes range from 1.22×2.44m to 2×3m, with thicknesses from 1mm to 50mm. Lead times for custom colors average 4-6 weeks. Major manufacturers include Mitsubishi Chemical (Shinkolite), Altuglas International (Plexiglas), and Röhm (Acrylite). Price volatility tracks closely with methyl methacrylate monomer costs.
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