Metaldye Black LSB

Metaldye Black LSB is a very stable dye in powder form for coloring thin anodized film. It gives fast striking neutral black shade on aluminum. It is highly recommended for exterior applications due to its outstanding light fastness, weathering and heat resistance. Due to high concentration of dye, the consumption is much lower than other black dyes resulting into lower cost of black anodizing of aluminum. Metaldye Black LSB offers good leveling even at short immersion time.




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




Anodic coating thickness: 10 - 25 microns
Concentration: 8 - 10 g/l
pH range: 5.5 - 6.0
Buffering: Not required
Dye bath temperature: 60° - 70° C.
Immersion time: 5 - 10 min. for normal applications




The dyed oxide film must be properly sealed properly using a hot sealing 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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