SANODURE Grey HLN Liq

Sanodure® Grey HLN Liquid  
 
 
 
Homogeneous, water soluble dyestuff for the adsorptive dyeing of anodized aluminium.  
 
Sanodure® Grey HLN Liquid is distinguished by its neutral grey shade, very good light fastness and 
high fastness to heat. 
 
Only recommended for interior use. 

1. Dye-specific properties  
 
Commercial form: black liquid 
Nuance: neutral grey 
Chemical character: Azo dye, heavy metal complex  
Storage stability: at least 1 year in closed containers between 0°C and 50°C 
Density at 20°C: 1100 g/l 
Solubility: unlimited in water 
Ecotoxicological data: see Safety Data Sheet. 
 
2. Application conditions 
 
Concentration, dyeing temperature and time 
 
 Concentration Dyeing temperature Dyeing time 
Pale grey shades 0.1 - 0.5 g/l 20 - 30°C 10 - 20 min 
Medium grey shades 0.5 - 1.0 g/l 20 - 30°C 10 - 20 min 
Dark grey shades 1.0 - 5.0 g/l 25 - 60°C 20 - 40 min 
 
Dyeing pH: 5.5 - 6.0 
Buffer: The dyebaths are preferably buffered with 
  8  g/l   sodium acetate trihydrate 
 + 0.4  ml/l  acetic acid 100%. 
Dyeing: For faultless, homogeneous results, we recommend carrying out 
the dyeings in an agitated dyebath. 
Water quality: preferably deionized 
Sealing: preferably with Anodal® ASL (one or two stage). 
 
 
3. Preparation of the dyebath 
 
As the dye is available in dissolved form the dyebath can be set or strengthened by simply 
adding the dye. 
 
 
4. Lightfastness of the dyeings (ISO 2135) 
 
 pale grey shades :  rating  5 - 6 
 medium grey shades :  rating  6 - 7 
 dark grey shades :  rating  7 - 8 
 very dark grey shades : rating  > 8 
 
 5. Special remarks 
 
- Unsealed dyeing can be skipped with nitric acid. 
 
 - The dyebaths are sensitive to sulphate; anodized objects should therefore be 
  rinsed thoroughly before dyeing.  
 
 - Prevention of mould formation : 
 An addition of an antimicrobial product can inhibit mould formation for a long time.  
 We recommend the addition of Nipacide CI 15(See Technical Information) 25 – 50 mg/l. 
 
 
6. Disposal of spent dyebaths  
 
Spent dyebaths must be disposed of with Anodal® WT-1 Liquid. The precipitation method is 
described in the Technical Information bulletin for Anodal® WT-1 Liquid.  
 
The table below gives the dosages necessary for precipitating Sanodure® Grey HLN Liquid: 
 
Precipita-Etching 
FeClAnodal® WT-
tion 3, 40% Residual dye Residual Cr 
lye 1 in filtrate in filtrate 
method ml/g dye ml/g dye Liquid mg/l mg/l 
ml/g dye 
A 3.0 - 0.4 < 0.1 < 0.05 
B 3.0 - 0.5 < 0.1 < 0.05 
C - 3.0 0.6 < 0.1 < 0.05