4J29 tube 1.Specilizing in kovar material 2. Have ISO9001:2008, RoHs,Test Report 3. A professional factory Our comany is specialized in producing Kovar, 4J29 ,4J29 kKovar specification:Plate, sheet, strip, rod, bar, wire, tube.1.Alloy grades and chemical composition consistent with the provisions of table 1 the chemical composition of Kovar(%)CPSMnSiCuCrMoNiCo Fe Not more than≤0.030.0200.0200.50. ...