Wire mesh and Single rail Cable Tray
November 13, 2017
Thermal Expansion and Contraction of Cable Tray
November 13, 2017

Finishing Of cable Tray

Finishing of Cable Tray

(1)    Galvanized Coatings

  • The most widely used coating for cable tray is galvanizing. It is cost-effective, protects against a wide variety of environmental chemicals, and is self-healing if an area becomes unprotected through cuts or scratches.
  • Steel is coated with zinc through electrolysis by dipping steel into a bath of zinc salts. A combination of carbonates, hydroxides and zinc oxides forms a protective film to protect the zinc itself. Resistance to corrosion is directly related to the thickness of the coating and the harshness of the environment.


(2)    Pre-Galvanized:

  • Pre-galvanized, also known as mill-galvanized or hot dip mill-galvanized, is produced in a rolling mill by passing steel coils through molten zinc. These coils are then slit to size and fabricated.
  • Areas not normally coated during fabrication, such as cuts and welds, are protected by neighbouring zinc, which works as a sacrificial anode. During welding, a small area directly affected by heat is also left bare, but the same self-healing process occurs.
  • G90 requires a coating of .90 ounces of zinc per square foot of steel, or .32 ounces per square foot on each side of the metal sheet. In accordance with A653/A653M pre-galvanized steel is not generally recommended for outdoor use or in industrial environments.


(3)     Hot-Dip Galvanized:

  • steel cable tray has been manufactured and assembled, the entire tray is immersed in a bath of molten zinc, resulting in a coating of all surfaces, as well as all edges, holes and welds.
  • Coating thickness is determined by the length of time each part is immersed in the bath and the speed of removal. Hot dip galvanizing after fabrication creates a much thicker coating than the pre-galvanized process, a minimum of 3.0 ounces per square foot of steel or 1.50 ounces per square foot on each side of the sheet.
  • The process is recommended for cable tray used in most outdoor environments and many harsh industrial environment applications.

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