Learn about acrylic sheet processing factory

We are an acrylic sheet processing factory, today we will show you the performance of our products. In fact, the professional name of our product is polymethyl methacrylate.

Electrical properties

Since polymethyl methacrylate contains polar methyl ester groups at the side of the main chain, its electrical properties are inferior to non-polar plastics such as polyolefin and polystyrene. The polarity of the methyl ester group is not too great, and polymethyl methacrylate still has good dielectric and electrical insulation properties. It is worth pointing out that polymethyl methacrylate and even the entire acrylic plastics have excellent arc resistance. Under the action of arc, the surface will not produce carbonized conductive paths and arc track phenomena. 20°C is a secondary transition temperature, which corresponds to the temperature at which the pendant methyl ester groups start to move. Below 20°C, the pendant methyl ester groups are in a frozen state, and the electrical properties of the material will be improved compared to those above 20°C.

Solvent resistance

Polymethyl methacrylate can withstand relatively dilute inorganic acids, but concentrated inorganic acids can make it corrode and alkali-resistant, but warm sodium hydroxide and potassium hydroxide can make it corrode and salt-resistant And grease, resistant to aliphatic hydrocarbons, insoluble in water, methanol, glycerin, etc., but can absorb alcohol and swell and cause stress cracking. It is not resistant to ketones, chlorinated hydrocarbons and aromatic hydrocarbons. Its solubility parameter is about 18.8 (J/CM3) 1/2, and it can be dissolved in many chlorinated hydrocarbons and aromatic hydrocarbons, such as dichloroethane, trichloroethylene, chloroform, toluene, etc., vinyl acetate and acetone can also make it Dissolve.

Polymethyl methacrylate has good resistance to gases such as ozone and sulfur dioxide.

Weather resistance

Polymethyl methacrylate has excellent resistance to atmospheric aging. After 4 years of natural aging test, the sample has a slight decrease in tensile strength and light transmittance, a slight yellowing in color, and a decrease in crazing resistance. Obviously, the impact strength has been slightly improved, and other physical properties have hardly changed.

Combustibility

Polymethyl methacrylate is easy to burn, and its limiting oxygen index is only 17.3.