PMMA Acrylic (Plexiglas): Optical & Weathering Properties
Published: 2026-06-02
PMMA transmits 92% visible light. Does not yellow with UV exposure unlike PC. Preferred for outdoor signage, tail lights, and architectural glazing. Dry at 80°C for 3h. Avoid impact loading.
PMMA transmits 92% visible light. Does not yellow with UV exposure unlike PC. Preferred for outdoor signage, tail lights, and architectural glazing. Dry at 80°C for 3h. Avoid impact loading.
Technical Properties
| Density | 1.19 g/cm³ |
|---|---|
| Tensile Strength | 70 MPa |
| Melting Point | Amorph (Tg 105°C) |
| Shrinkage Rate | 0.4-0.7% |
| Flexural Modulus | 3.0 GPa |
| Hdt | 95 °C at 1.82 MPa |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Plexiglas 8N | |
| Acrylite FF |
Frequently Asked Questions
Why doesn't PMMA yellow like PC?
PMMA's ester groups don't absorb UV like PC's carbonate groups. PC undergoes photo-Fries rearrangement producing yellow chromophores.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org