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Design for Manufacturing:

Surface Finishing

Factors to consider when choosing surface finishing for sheet metal parts

Visual RequirementsVisual parts or non-visual parts
Corrosion RequirementsThe environment in which the parts will be used – indoor, outdoor or corrosive environment
FunctionalityWhether the parts will be subject to friction and tight tolerances
UsageMechanical usage of the parts and surface finish friction test requirements

Surface Finish Costs

  • Powder Coating cost depend on performance requirements
  • Geomet costs up to three times the cost of white zinc
  • Electrocoating costs the same as white zinc

Surface Finish

Surface Finish Thickness


(Hour/Salt Spray Test)


Powder Coating

70µm – 150µm

96h – 1000h NSS

Indoor / Outdoor and high visual Requirements

White Zinc

5µm – 8µm

48h – 96h

Indoor / Outdoor & Low Visual Requirements




Indoor / Outdoor & Low Visual Requirements


2µm – 8.6µm


Outdoor & Tolerances

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