This process in the commerical window trade is limited generally to structural elements that are not visible. The protective finish is achieved by either hot dipping or electroplating of the steel or iron with zinc. Hot dipping produces a duller grey finish whilst the electroplating appears as a brighter silver coating. The zinc acts as a sacrificial anode to the metal it coats - and even if the coating is scratched the exposed steel will, under most conditions, remain protected from the remaining zinc.


  • Low cost.
  • Under most service conditions - long maintenance free service life.
  • Durable.