| About |
|---|
| ACRYLITE® 249 acrylic sheet meets and is certified to MIL-P-8184F (Type II, Class 2). ACRYLITE® 249 is a cross-linked cast acrylic sheet with increased resistance to crazing and solvent attack, as well as improved dimensional stability after heating. This specification requires optical quality cast acrylic sheet that is superior to conventional acrylic sheet. ACRYLITE® 249 sheet is used in a wide variety of aviation and ground vehicle transparencies in monolithic or laminated form.&& |
| Product Description | |
|---|---|
| Supplier | ROHM |
| Generic | PMMA |
| Material Status | Commercial: Active |
| Features | Good Clarity,Machinable,Good thermal shock resistance,Solvent resistance,High ESCR |
| Availabilitys | North America |
| Process Methods | Thermo forming |
| Technical Data | |||
|---|---|---|---|
| PHYSICAL | Nominal value | Unit | Test method |
| Density | 1.19 | g/cm³ | ASTM D792 |
| Water absorption rate | |||
| 24hr | 0.13 | % | ASTM D570 |
| MECHANICAL | Nominal value | Unit | Test method |
|---|---|---|---|
| tensile strength | 80.3 | MPa | ASTM D638 |
| Tensile strain | |||
| yield | 4.4 | % | ASTM D638 |
| THERMAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Hot deformation temperature | |||
| 1.8 MPa, unannealed | 112 | ℃ | ASTM D648 |
| Linear coefficient of thermal expansion | |||
| MD | 5.6E-5 | 1/℃ | ASTM D696 |
| FLAME CHARACTERISTICS | Nominal value | Unit | Test method |
|---|---|---|---|
| Burning rate | |||
| 12.7 mm | 21 | mm/min | ASTM D635 |
| optical performance | Nominal value | Unit | Test method |
|---|---|---|---|
| Transmittance | |||
| — | 92.6 | % | Internal Method |
| — | 92.5 | % | ASTM D1003 |
| Haze | |||
| — | 0.30 | % | Internal Method |
| — | 0.70 | % | ASTM D1003 |
| Supplementary information | Nominal value | Unit | Test method |
|---|---|---|---|
| Crack resistance | |||
| Dry： Isopropanol | 21.7 | MPa | |
| Dry： Toluene/Isobutyl Acetate | 14.5 | MPa | |
| Wet： Isopropanol | 15.9 | MPa | |
| Wet： Toluene/Isobutyl Acetate | 11.1 | MPa | |
| Internal Strain | 0.30 | % |
| Notes |
|---|
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