1. Hardness: Hardness is one of the parameters that best reflects the production process and technology of cast acrylic sheet, and it is an important part of quality control. The hardness can reflect the purity of the raw material MMA, the weather resistance of the sheet and the high temperature resistance. The hardness directly affects whether the sheet will shrink and bend, and whether the surface will crack during processing. Hardness is one of the rigid indicators for judging the quality of acrylic sheets. Imported cast acrylic sheet has the highest hardness index of the same domestic product. The average Darlow hardness value is about 89 degrees.
2. The transparent acrylic sheet has a light transmittance comparable to glass, but the density is only half that of glass. In addition, it is not as fragile as glass, and even if it is broken, it will not form sharp fragments like glass.
3. Acrylic has good comprehensive mechanical properties and ranks in the forefront of general-purpose plastics. The tensile, bending, and compression strengths are all higher than polyolefins, and higher than polystyrene, polyvinyl chloride, etc., and the impact toughness is poor, but it is slightly Better than polystyrene. The cast bulk polymerized polymethyl methacrylate sheet (such as aerospace plexiglass sheet) has higher tensile, bending, and compression mechanical properties, and can reach the level of engineering plastics such as polyamide and polycarbonate.
4. Acrylic has excellent resistance to atmospheric aging. After 4 years of natural aging test, its sample has changed its weight, its tensile strength and light transmittance have decreased slightly, its color is slightly yellowed, and its crazing resistance has decreased significantly. The strength is slightly improved, and other physical properties are almost unchanged.