Why Crittall USA?

CRITTALL WINDOWS, LTD was established 150 years ago in Braintree, Essex, England. Over the years, Crittall pioneered and standardized the steel window industry, and became the dominant source of steel windows and doors internationally with manufacturing facilities on five continents.

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Hot Dipped Galvanized Steel

Crittall

About Crittall's Hot Dipped Galvanized Steel and Powder Coating

All Crittall windows and doors are hot-dip galvanized after manufacture to ASTM A 123 (BS EN ISO 1461:1999). Because they are entirely immersed in molten zinc, the windows and doors are completely protected against corrosion.

The Galvanizing Process

The hot- dip galvanizing process provides corrosion protection to mild steel components by coating and chemically bonding pure zinc to the steel substrate.

Transformation Process

Large rolls or coils of steel are fire treated with a hot dipped galvanizing process utilizing the Sendzimir system, this coating of zinc on both sides ensures ultimate protection against corrosive agents. The resulting product is then sent thorough a series of rollers to produce specify c shapes used for our section profiles while maintaining the galvanized coating

Crittall Galvanized Steel

Advantages

  • Stage 1: Degreasing.
  • Stage 2: Removal of Oxides/Millscale
  • Stage 3:Rinsing
  • Stage 4: Fluxing
  • Stage 5: Drying

 

The process removes rust and scale by "pickling" in acid. The acid is washed away and dried prior to immersion in a bath of molten zinc.

Finish

After the transformation from rolls of steel to frame sections, and finally completed units, we utilize any of the RAL colors as a standard selection. Our powder coating process offers a high quality durable finish. This painted finish can easily match any of your color needs.

Colors Available

Crittall RAL Color Chart

Crittall products are powder coated and then painted in a wide range of available colors. Click the link to the right to see all of the color options available. Please note, small orders may incur additional fees for custom colors.

 

 

 

Dura life Epoxy-Free Polyester Powder Coating

In preparation for the polyester powder coating, the galvanized surface of the windows and doors are chemically cleaned and chromated. The prepared surface will now accept an electrostatic ally sprayed epoxy-free polyester powder coating AAMA 603 605. A minimum coating of 60 microns (0.002 inch) is applied to ensure excellent exterior durability and color retention.

The Poweder Coating Process

  • Stage 1: Degreasing/Removal of Oxides
    10% w/v Phosporic acid, 21/2 minutes, 55°
  • Stage 2: Rinsing
    Main water rinse, 2 minutes, ambient temperature
  • Stage 3: Rinsing
    Main water rinse, 2 minutes, ambient temperature
  • Stage 4: Chromate Conversion Coating
    50% v/v Chromic Acid, 1 minute, ambient temperature
  • Stage 5: Rinsing
    Main water rinse, 2 minutes, ambient temperature
  • Stage 6: Conditioning Rinse
    Deionized water-conductivity less than 100 micro Siemens, 2 minutes, ambient temperature
  • Stage 7: Degassing
    Heat components to 464° Fahrenheit and maintain for 7 minutes

Coating

  • Stage 8: Powder Application
    Electrostatic spray. Automatic with manual touch in
  • Stage 9: Thermosetting/Cure
    Gas fired forced convection oven- 10 Minutes at a metal temperature of 392° Fahrenheit

Polyester powder coating is one of the most durable protective coatings for hot-dip galvanized steel, although it is not necessary to protection against corrosion the duplex system is especially long lasting. With proper maintenance, and taking into account environmental and climate conditions, life expectancy of the polyester powder coating can be as long as 75 years*. (American Galvanizers Association "Duplex Systems: Painting over Hot-Dip Galvanized Steel")

Finish

After the transformation from rolls of steel to frame sections, and finally completed units, we utilize any of the RAL colors as a standard selection. Our powder coating process offers a high quality durable finish. This painted finish can easily match any of your color needs.

 

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