®Cast polymethylmethacrylate sheets for use in acoustic insulation, for example those used in motorways. This material permits the reduction in sound level transmitted through the acrylic sheet. The maximum standard sizes are: 3000 x 2000 mm, the most usual thicknesses are 15 and 20 mm. The most used colours are: clear, transparent, smoked transparent and transparent colours.
The applicable certification is the German regulation ZTV-Lsw 88, which requires certain mechanical resistance properties, high protection to UV light, high luminous transmission, resistance to atmospheric inclemency, etc. The analysis carried out on these
® sheets give us results which confer optimum properties to this material for use as acoustic insulation panels.| Technical characteristics | |||
Strength UV
| 99.82 5 | % grey scale | ISO 2857 ISO 4892 |
| Light transmittance | 93 | % | ISO 2857 |
| Refractive index nž (Method A) | 1,490 | - | ISO/R 489 |
| Density - Volumic mass (Method A) | 1,19 | g/cm3 | ISO 1183 |
| Water absorption (Method 1) | 0,1 | % | ISO 62 |
| Tensile strength (Test type 1, speed B) | 79 | N/mm2 | ISO 527 |
| Rockwell hardness (Escale M) | 104 | | ISO 2039/2 |
| Impact strength. Charpy method | 14 | Kj/m2 | ISO 179/2D |
| Flexural strength | 115 | n/mm2 | ISO 178 |
| Modulus of elasticity (Test type 1, speed B) | 3300 | MPa | ISO 527 |
| Coefficient of lineal expansion | 70,6 . 10-6 | K-1 | ISO 527 |
| VICAT softening point | 110 - 118 | ºC | ISO 306 |