... or Outer diameter 220mm6. Coating:Ni, Zn, NiCuNi, gold, copper, epoxy, chemical, parylene, Everlube, passivation ,tin and CR3 ... delivery.9.Surface Treatment Method: a)Metallic Zinc, Nickel, Nickel+Nickel, Copper+Nickel, Nickel+Copper+Nickel, b)Temporary Surface: Passivation c)Dimension are ... be coated for long term maximum energy output Low working temperature for heat applications, but higher ...