FR-4 Insulating Boards are rigid insulating materials made by baking and hot-pressing impregnated paper, cotton fabric, glass fabric, impregnated phenolic, and epoxy resins. Epoxy resin insulating boards offer high mechanical strength, dielectric properties, oil resistance, and corrosion resistance. FR-4 insulating boards are suitable for use as insulating structural components in electrical machinery and equipment with high requirements, and they can be used in humid environments and transformers, with a heat resistance grade of F. Product Details Product Features: 1. The FR-4 insulating board should have a smooth and flat appearance, without impurities or other obvious defects. Minor scratches are permissible, and the edges should be cut neatly. The end faces must not have delamination or cracks. 2. FR-4 insulating board dimensions: the area should not be less than 380×480 square millimeters. Special specifications can be produced upon agreement between both parties. Other data can be found in the Ministry of Mechanical and Electrical Standards. 3. FR-4 insulating board products can be processed according to customer requirements into various sizes of plates, pipes, washers, flanges, tiles, and other non-standard shapes. Standard Sizes: 1020mm*1220mm Colors: Yellow, black, aquamarine, etc.