1. Polymethyl methacrylate can withstand dilute inorganic acid, but strong inorganic acid can make it erode and alkali-resistant, but warm sodium hydroxide and potassium hydroxide can make it erode, salt-resistant and oil-resistant, fat-resistant hydrocarbons, insoluble in water, methanol, glycerol and so on, but can absorb alcohol swelling, and produce stress cracking, not resistant to ketones, chlorinated hydrocarbons and aromatic hydrocarbons. Its solubility parameter is about 18.8 (J/CM3) 1/2. It can be dissolved in many chlorinated hydrocarbons and aromatics, such as dichloroethane, trichloroethylene, chloroform, toluene and so on. It can also be dissolved by ethylene acetate and acetone.
2. Polymethyl methacrylate has good resistance to ozone and sulfur dioxide.
Polymethyl methacrylate (PMMA) has excellent atmospheric aging resistance. After four years of natural aging test, the tensile strength and transmittance of the samples decrease slightly, the color yellows slightly, the anti-craze property decreases obviously, the impact strength increases slightly, and other physical properties almost remain unchanged.
Polymethyl methacrylate (PMMA) is easy to burn and its limiting oxygen index (LOI) is only 17.3.