lass-Fused-to-Steel (GFtS), also known as Glass-Lined-Steel (GLS), is the ultimate when it comes to tank and silo containment storage design. It is made of enamel steel plates ,self-looking bolts ,sealant and another accessories etc.The fusing together of these two materials deliver the best characteristics of both materials. The strength and flexibility of the structure is provided from the steel while the structure's surface is protected by the glass..