TOP SEALING Ceramic Fiber Yarn 4000Y is manufactured from high quality alumina-silica ceramic fiber and it has been twisted to give it tensile strength. The yarn is available as E-glass or stainless steel wire reinforced yarn from 425 tex to 2500 tex in single, two or three plies. The product can be woven, plaited into numerous forms of products which are strong, chemically stable and exhibit superior thermal properties, ideal for most industrial high temperature applications.