Acrylic (PMMA)
Acrylic (PMMA, often called Perspex or Plexiglas) is a crystal-clear, rigid plastic with better light transmission than glass and excellent weather resistance. It is used for display panels, covers, signage, light guides and sight windows.
What it is
Acrylic transmits about 92% of light, resists UV and weathering, and can be laser cut, machined, polished, bent and bonded to near-invisible joints. It is harder and more scratch resistant than polycarbonate but less impact resistant.
Cast acrylic machines and polishes better; extruded acrylic is cheaper with tighter thickness tolerance.
Typical applications
- Display cases and covers
- Signage and light boxes
- Sight windows and inspection covers
- Light guides and diffusers
- Protective screens
Materials & grades
- Cast acrylic sheet
- Extruded acrylic sheet
- Acrylic rod and tube
- Tinted and frosted acrylic
Points to consider
- Brittle on impact compared to polycarbonate; not for safety guards.
- Can craze with some solvents and cleaners.
- Laser cutting gives polished edges.
- Allow for thermal expansion in frames.
Frequently asked questions
Is acrylic the same as Perspex?
Yes. Perspex and Plexiglas are well-known brand names for acrylic sheet; the generic material is PMMA.
Acrylic or polycarbonate?
Acrylic is clearer, more scratch resistant and cheaper; polycarbonate is far more impact resistant for guards.
Can acrylic be laser cut?
Yes. Laser cutting gives clean, flame-polished edges on acrylic.