... RoHS certification for R134a, R600a refrigerant Specifications(wire tube evaporator)Raw material1) Rolling welded steel pipe: 8 ... bending, welding wire, molding, assembly welding, leak testing, pre-treatment, electrophoresis, spraying, packing Technical standardsWire pitch: ≥ 5 , can ... electrophoresis coating 15 ∼ 20 μ m; thickness of wire-tube evaporator powder coating:60 ∼ 300μ mHardness of coating≥ ...