PMMA. Acrylic. Optical-grade. Clear plastic.
PMMA (Polymethyl Methacrylate, "Perspex", "Plexiglas", "acrylic") — optical-grade clear plastic. Best UV stability among transparent plastics. Standard for displays, signs, light fixtures.
PMMA Perspex
PMMA: clearer, more scratch-resistant, less impact. PC: tougher (250× more impact), less clear (88%), scratches easier.
Key principles.
Amorphous thermoplastic
Crystal-clear, scratch-resistant for plastic, brittle in impact.
92% transparency
Highest visible-light transmission of any plastic. Better than glass in some respects.
Excellent
30+ year outdoor without yellowing. UV-stable inherent.
UTS 70 MPa
Stiff but brittle. Notched Izod 16 J/m — low impact.
Excellent
CNC machines beautifully. Polishable to optical surface.
Mid-range
~$4-6/kg. Cast acrylic more expensive than extruded.
FAQ
PMMA: clearer, more scratch-resistant, less impact. PC: tougher (250× more impact), less clear (88%), scratches easier.
Cast: more uniform, better optical, more expensive. Extruded: cheaper, slight optical variation, faster lead time.
Solvent welding (methylene chloride, MMA monomer). Cyanoacrylate. Acrylic-specific adhesives.
PC superior to PMMA for ballistics. PMMA shatters; PC absorbs energy.
PMMA excellent — virtually unaffected by 30+ year UV exposure. Stays clear.
Aquariums, museum cases, signage, light fixtures, helicopter canopies.
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