PMMA Polymethylmethacrylate PMMA is a polymer, manufactured from the monomer  Methylmethacrylate. PMMA is also known under the name  Plexiglas® or acrylic glas. The glassy polymer finds a use often in watch glasses, glasses, lenses, greenhouses and so on. Manufacturing • by radically or anionic polymerisation • polymerisation of liquid MMA (Methylmethacrylate) by the use of an initiator Properties Overview name polymethylmethacrylate classification - polymer - thermoplastic Manufacturing monomer - Methylmethacrylate (MMA) production  - radicallic or anionic polymerisation Properties aggregate state solid general - relatively scratch resistant - good weather stability - good electrical isolation - good chemical resistance against middle acid- and base concentrations - alcohol solutions (over 30%), organochloride and concentrate acid or base solutions pit the PMMA → small cracks - more transparent than glass in the visible spectral range Mechanical density 1,2 g/cm³ hardness D-70 up to D-80 tensile strength 75 MPa breaking elongation 7 % friction coefficient Electrical dielectric constant 3,2 (10³ - 10⁶ Hz) specific resistance   > 10³ Ω * mm dielectric strength ~ 23 kV/mm Thermal melting temperature 110 °C heat capacity heat conductivity combustion heat   operation temperature up to 85 °C (short up to 100 °C) Optical refractive index 1,49 Application • greenhouses, canopies, glazing in general • lenses, glasses, watch glasses, chain of lights • protheses in the dental medicine • reflectors on cars, bikes ... • bone cement in orthopedic fields • due to the high transparency as walls for aquariums • protection claddings • shower cubicle, sinks Copyright © 2010 polyneub.com  - Matthias Neuber - about  - general terms and conditions Manufacturer Service Provider