Metaldye Black MLW

Metaldye Black MLW Powder is ideally suited black colorant for architectural quality applications because of its excellent light and weather fastness.




Physical appearance: Black to dark grey powder
Chemical description: Metalized azo dye
Light fastness: 8 +
Weather fastness: Excellent
Heat fastness: 120° C.




Anodic coating thickness: More than 15 microns
Concentration: 8 - 10 g/l
pH range: 4.2 - 4.8
Dye bath temperature: 55° - 60° C.
Immersion time: 10 - 20 minutes




The dyed oxide film must be properly sealed properly using a hot sealing salt product, from ALFISEAL products range, for best result.

Other Recommendation:

1) Ammonium compounds shall not be used for controlling of the pH or to buffer dye bath solution.

2) The presence of ammonium compounds in the sealing solution may cause leaching and loss of color.

3) Use sodium acetate for dye buffer.

4) Adequate care to be taken for proper rinsing to control drag-in for optimum tank life.

5) Dye may be dissolved separately outside the dye bath. Use demineralized water for better dye bath stability.

6)  The life of dye bath is reduced by water containing ammonium.


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