PMMA (Acrylic)
Polymethylmethacrylate — the optical-quality plastic. 92% light transmission (better than glass). Excellent weathering resistance and UV stability. Hard but brittle (no yielding — fractures). Trade names include Plexiglas (Röhm/Evonik), Perspex (Lucite), Acrylite (Mitsubishi). Used for signs, displays, light guides, automotive tail lamps, aquariums, skylights, and protective shields.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | PMMA | — | REF | |
| 🇺🇸 | ASTM | USA | ASTM D788 | — | 100% |
Sources: ISO 8257, ASTM D788
Chemical composition comparison (wt%)
Side-by-side: PMMA (Acrylic) (COMPOSITION) (ISO 7823) vs ASTM D788 (ASTM)
| Element | PMMA (Acrylic) (COMPOSITION) | ASTM D788 (ASTM) | Overlap |
|---|---|---|---|
| Base Polymer (Polymethyl Methacrylate) | 99–99.9% | — | — |
Mechanical properties
Injection Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 50–75 | MPa |
| Elongation | 2–6 | % |
| Elastic Modulus | 2.7–3.2 | GPa |
| Density | 1.17–1.2 | g/cm3 |
| Glass Transition Temp (Tg) | 100–110 | °C |
| light_transmission | 91–93 | % |
| Water Absorption (24h) | 0.1–0.3 | % |
Compatibility verdict
PMMA (Acrylic) and ASTM D788: 100% composition match
Close equivalents but NOT identical.
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