... 3. A professional factory We are selling Kovar sheet,Invar sheet,alloy 52 sheet,etc.Controlled Expansion AlloyFor applications where metals must ... porosity free product. Its expansion characteristics match both borosilicate (Pyrex) glasses and alumina ceramics. It is one of the ... values in the table are for reference only.Specification: Plate, sheet, strip, rod, bar, wire, tube.We are looing forward ...