Domestic imports of acrylic board-Japan's Mitsubishi [formerly British Lucite was acquired by Japan's Mitsubishi Liyang Company], Germany's Degussa and Bayer three brands. The acrylic board produced by this method is made by continuous casting, which can obtain good accuracy, so the production accuracy of the thickness of 10mm can reach +/- 0. 1mm, which can be applied to the IT field with LCD light guide plate as the main part and strict requirements on dimensional tolerance. Because of its excellent thickness accuracy, it can realize the uniformity of signboard tone and stable geothermal molding. It also has excellent light transmittance. On the basis of machinability and light weight, it is endowed with excellent scratch resistance, and the quality of Degussa can be guaranteed not to turn yellow for 30 years and not to fade for 10 years. It conforms to the ROHS standard of the European Union and has passed the ISO 900 1 quality system certification and ISO 1400 1 environmental system certification. However, due to its high price, the finished products are generally only used in the logo system of high-end enterprises. Taiwan-funded board (another imported board)-refers to the board made of pure raw materials with the technology of British Lucite (MMA) and Taiwan Province Province. Most molds used to produce plates are made in England and Germany. Common brands in the market are: Ruichang, Shenmei, etc. Some brands, such as Tomson, Chuangya and Lvchuan, are also the so-called Taiwan Province provincial boards. The acrylic board produced by this process has the advantages of uniform color, no watermark, small wave thickness error, high transparency, purity and transparency, no impurities and moderate price, which is well received by the public. Domestic plate refers to the raw materials used in the production of plate, one of which is domestic, and the other is the secondary processing of various recycled materials (PMMA) of acrylic plate. But the disadvantage is that the surface water mark is obvious, the thickness is uneven, it is easy to yellow, and it is not suitable for plastic molding, but only for carving. The advantage is low price.