Insulating Board - Possesses excellent physical and mechanical properties, with superior insulation capabilities, suitable for operation in environments with high dielectric constant requirements in dry air ranging from -35 to +100°C. Leather Support Board - Primarily composed of alkali-free glass fabric and epoxy resin, this product is used inside phone cases, offering superior performance compared to previous cardboard options. It features waterproofing, high-temperature resistance, and is less prone to deformation.