Our bottom block is made from high quality raw material, processed by fine batching, forming, drying and firing process. After that the block will be matched by cutting, grinding, milling and drilling to assure of the accurate sizes. The physical and chemical properties of our bottom block are excellent, the appearance and size are accurate, especially the anti hydrogen diffusion ability and anti alkali erosion ability of the product are remarkable. This block can be used in the whole bottom of floating glass tin bath.