Sheet in PMMA C LED 3050x2030 mm white

PMMA, polymethyl methacrylate or everyday acrylic, is cast here, that is cast in a mold instead of pressed through a die in the LED version. Cast acrylic has longer molecular chains than extruded, which gives higher heat resistance, better mechanical values and tougher glued joints. At the same time it is harder to thermoform and slightly more expensive.

The density is 1.19 g/cm³. The tensile strength is 78 MPa, the tensile modulus 3350 MPa and the flexural strength 118 MPa. The elongation at break is 5.8 percent and the flexural modulus 3200 MPa. The impact strength is 16 kJ/m² unnotched and 2 kJ/m² notched. Vicat B50 sits at 110 °C and HDT/B at 0.45 MPa at 114 °C.

The maximum service temperature is 80 °C continuously and 90 °C for short periods. Decomposition does not start until above 280 °C. The linear expansion is 70 x 10⁻⁶ per kelvin and the thermal conductivity 0.19 W/(m·K). The light transmission for transparent sheets is 92 percent at 3 mm thickness and the refractive index 1.492. The water absorption is 0.2 percent after 24 hours immersed and 2.1 percent at saturation. The dielectric strength is 30 kV/mm and CTI 600 V. The building fire class is B2 per DIN 4102 and E per EN 13501. Transparent grades are approved for direct food contact under EU 10/2011.

The sheet is sawn, milled, drilled and polished with tools made for plastic. Thermoforming is done at temperatures around 160 to 170 °C for cast acrylic. Acrylic adhesive with methyl methacrylate is the standard choice for bonding. After milling and bonding the material should be annealed to reduce internal stresses and avoid stress cracking.

The LED acrylic is used for backlit signs, light boxes, illuminated letters and lighting panels recessed into furniture. Opal white and white grades spread the light from point sources into an even surface, so the diodes do not show through the sheet. The choice of thickness and opacity decides how bright the panel becomes and how close the LED strip can sit.

This cast LED sheet is 3050x2030 mm in white, a format that suits both large surfaces and parts that are cut to your dimensions.

Do you have a specific application in mind? We will help you pick the right one.