Engineering plastic
PMMA / Acrylic
The clarity and surface-finish choice for windows, light guides and display components.
01 · QUICK ANSWER
When should you choose PMMA / Acrylic?
Use cast acrylic for better machining behavior and stress resistance. Extruded sheet is economical but is more likely to chip or craze during machining and polishing.
02 · SELECTION DATA
Typical properties at a glance
Screening values only. Final design data must follow the exact grade, condition, stock form and supplier certificate.
Density1.18–1.20 g/cm³
Strength range55–75 MPa tensile
TemperatureContinuous use often ≤80°C
MachinabilityGood
03 · ENGINEERING NOTES
Specify what changes the result
A material name alone is not enough. Include grade, condition, finish and documentation on the drawing or purchase specification.
- Cast PMMA
- Extruded PMMA
- Impact-modified acrylic
- Optical acrylic
- Display windows
- Light guides
- Optical fixtures
- Transparent covers
- More brittle than polycarbonate
- Solvents can cause crazing
- Flame polishing can alter dimensions
- As machined
- Mechanical polish
- Vapor polish
- Flame polish
04 · MANUFACTURING FIT
Available process routes
CNC machiningCommonly available
Sheet metalCommonly available
3D printingReview by grade and geometry
05 · NEXT COMPARISON