2022.05.09 01:05assembly in a coordinated process with the mouldsAcrylic sheets are made from plastic mold and are used to form or mold things. Urea is a compound found in mammal urine. In 1828, urea was artificially produced and plastic was created for the first time. Then in 1843 acrylic acid was invented. By the 20th century these sheets were started to be used commercially. During the Sec...