| Acrylic | Rigid Vinyl | Polycarbonate | |
| Index of Refraction | 1.49 | 1.54 | 1.586 |
| Tensile Modulus (103 PSI) | 325-470 | 350-600 | 345 |
| Flexural Modulus (103 PSI) | 390-470 | 300-500 | 340 |
| Hardness | M8 |
D65-85 (Shore) | M70-M72 (Rockwell) |
| Thermal expansion (10-6/°C) | 76 | 76 | 68 |
| Service Temp., °C | 80 | 70 | 120 |
| Specific gravity | 1.19 | 1.45 | 1.20 |
| Effect of sunlight | none | yellows | yellows slowly |
| Physical properties of some materials available from Fresnel Technologies, Inc. | |||