Surface Finishes

Cooling Source offers a variety of heatsink Surface Finishes to protect your parts against most hazardous environments and meet your needs.


An electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of aluminum parts of heatsinks.

    • Aluminum oxide finish
    • Excellent emissivity
  • Sturdy finish
  • Low cost heatsinks
  • Hard anodizing for high temperature application
  • Custom color available upon request
  • Electrically non-conductive

Chromate (Chemfilm, Iridite, Alodyne)

A type of conversion coating used to passivate aluminum or copper.

  • Corrosion inhibitor
  • Prevent metal to tarnish
  • Low cost heatsinks
  • Available in clear and yellow
    • Clear:
    • Yellow
  • Electrically Conductive
    • Alodyne
    • Chemfilm
    • Trivalent Chromate,
    • Iridite

Heatsinks Mechanical Finish

  • Clean
  • Degrease
  • Etching
  • Deburr
  • Bead blasting
  • Sand blasting
  • Buffing
  • Brushing

Heatsinks Electrolsss Nickel

  • Solderable
  • Excellent for sturdy environments
  • Electrically conductive

Tin / Led

A finish that protects the underlying copper from corrosion on heatsinks.

  • Electrically conductive
  • Good solderability

Powder Coating

A type of coating that is electrostaticlly applied as a free-flowing, dry powder on heatsink’s metal and thermoplasitc

  • Custom color available up on request
  • Low cost heatsinks
  • No solvent required
  • Electrically non-conductive


  • Custom color available up on request
  • Low cost heatsinks
  • Electrically non-conductive

Surface Finishes

2021 Las Positas Ct, Ste 101
Livermore, CA 94551
Phone: (925) 292-1293
Fax: (925) 292-5061


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