Choosing the right plastic material is crucial for any project. The three most common options - PMMA (acrylic), PET-G, and Polycarbonate - each have distinct properties that make them ideal for different applications.
The Three Main Options
PMMA (Acrylic / Plexiglass)
Polymethyl methacrylate - the classic choice
The most popular plastic for displays and signage. Exceptional optical clarity (92% light transmission - better than glass), UV resistant, and easy to fabricate.
92%
Light Transmission
1.19
Density (g/cm³)
105°C
Heat Resistance
17x
Stronger Than Glass
Best for: POS displays, signage, lightboxes, aquariums, picture frames, protective barriers, awards, retail fixtures.
PET-G
Polyethylene terephthalate glycol-modified
A versatile material that's food-safe and chemical resistant. Slightly lower clarity than PMMA but better impact resistance and thermoforming properties.
88%
Light Transmission
1.27
Density (g/cm³)
70°C
Heat Resistance
FDA
Food Safe
Best for: Food displays, medical equipment, face shields, thermoformed parts, chemical containers, packaging.
Polycarbonate (PC)
The virtually unbreakable option
Extremely high impact resistance (250x stronger than glass). Used where safety and durability are critical. Can be bent cold without cracking.
85%
Light Transmission
1.20
Density (g/cm³)
130°C
Heat Resistance
250x
Stronger Than Glass
Best for: Machine guards, safety glazing, riot shields, motorcycle visors, greenhouse panels, vandal-proof applications.
Detailed Comparison
| Property | PMMA | PET-G | Polycarbonate |
|---|---|---|---|
| Optical clarity | 92% (Best) | 88% | 85% |
| Impact resistance | Moderate | Good | Excellent (Best) |
| UV resistance | Excellent (Best) | Good | Poor (yellows) |
| Scratch resistance | Good (Best) | Moderate | Poor |
| Heat resistance | 105°C | 70°C | 130°C (Best) |
| Food safe | No | Yes (Best) | Limited |
| Laser cutting | Excellent | Good | Not recommended |
| Cold bending | Limited | Good | Excellent (Best) |
| Price | $$ | $$ | $$$ |
Quick Decision Guide
What do you need?
Maximum optical clarity
→ PMMA
Outdoor use (UV exposure)
→ PMMA
Food contact
→ PET-G
Chemical resistance
→ PET-G
High impact / vandal-proof
→ Polycarbonate
Machine guards / safety
→ Polycarbonate
Laser cutting required
→ PMMA (or PET-G)
Lightbox / backlit display
→ PMMA opal
Summary
- PMMA - Best for displays, signage, and anything requiring optical clarity or outdoor UV resistance
- PET-G - Best for food applications, medical equipment, and chemical environments
- Polycarbonate - Best for safety applications requiring extreme impact resistance
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