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PMMA stands for Poly(methyl methacrylate). It is a transparent thermoplastic commonly known by brand names such as acrylic or Plexiglas, and is often referred to as "organic glass."
While PS (polystyrene) is also a clear plastic, PMMA is generally considered a higher-performance material and is frequently used as a lightweight, shatter-resistant alternative to glass.
Key Characteristics
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Excellent Transparency – PMMA transmits up to 92% of visible light, even more than standard glass.
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Impact Resistant – Its impact resistance is 7 to 18 times higher than ordinary glass.
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Lightweight – Its density is about 1.15–1.19 g/cm³, roughly half the weight of glass.
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Easy to Process – Can be easily machined (cut, drilled) and thermoformed.
At a Glance
| Property | Value |
| Visible Light Transmission | Up to 92% |
| Density | 1.17–1.20 g/cm³ |
| Impact Resistance (vs. glass) | 7–18x stronger |
| Max Continuous Service Temp | 65–95°C (149–203°F) |
| Surface Hardness | Low (scratches easily) |
Limitations
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Heat sensitive – Softens around 100°C (212°F); not for cookware.
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Flammable – Burns readily.
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Scratches easily – Often requires a protective coating.
Common Applications
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Optics (eyeglass lenses, camera lenses)
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Electronics (LCD screens, light guide panels)
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Construction (aquariums, skylights)
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Automotive (rear lights, instrument clusters)
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Medical (incubators, dental prosthetics)
PMMA vs. PS
| Property | PMMA (Acrylic) | PS (Polystyrene) |
| Clarity | Superior (92%) | Good (88–90%) |
| Impact Strength | High | Low (brittle) |
| Weather Resistance | Excellent | Poor (yellows outdoors) |
| Typical Use | Aquariums, lenses, signage | Disposable cups, CD cases |
