We can supply you kovar tube with good quality,ASTM F15. Note:Our comany is specialized ... producing Kovar. Kovar specification: Plate,sheet,strip,rod,bar,wire,tube. Looking forward to cooperating with you! 1.Alloy grades and ... atmosphere heated to 900 ± 20 oC, insulation 1h, and then heated to 1100 ± 20 oC, insulation 15min, to not more than 5 ...