Sanodure® Green LWN 
 
 
 
 
Homogeneous, water soluble dyestuff for the adsorptive dyeing of anodised aluminium. 
 
 
Only recommended for interior use. 
 
 
Clariant (Switzerland) Ltd  Sanodure®
 Green LWN  
16. 09. 2008 1 102264 
1. Dye-specific Data 
 
Commercial form: fine granules 
Chemical character: Azo-dyestuff, heavy metal complex 
Density: 750 g/l 
Solubility in water: 40 g/l at 20°C 
Storage stability: practically unlimited, in closed original containers   
Ecotoxicological data: see safety data sheet.  
 
 
2. Application conditions  
 
Concentration, dyeing temperature and time 
 
 Concentration Dyeing temperature Dyeing time 
Bright shades 0,05 - 0,2 g/l 25 - 60 °C 10 - 20 min 
Medium shades 0,3 - 0,8 g/l 25 – 60 °C 10 - 20 min 
Dark shades 1,0 - 3,0 g/l 25 – 60 °C 20 - 40 min 
 
 pH: 5,5 – 6,0  
 Buffer: The dyebaths are preferably buffered with  
     8    g/l   sodium acetate trihydrate  
  + 0,4 ml/l acetic acid for pH 5.6 
 Water quality: preferably deionized  
 Sealing: preferably with Anodal® ASL (one or two stage).  
 
 
3. Setting the Dyebath 
 
When setting the dyebath, care must be taken that the dyestuff is well dissolved.   
Dissolve the dye preferably with hot water (80°C) in a separate container (approx. 5 parts water 
to 1 part dye). Then this mother solution will be added to the dyebath while stirring. 
 
 
4. Lightfastness of the Dyeings 
 
Lightfastness of dark dyeings (12 µm) Note  7-8  (ISO 2135). 
 
Clariant (Switzerland) Ltd  Sanodure®
 Green LWN  
16. 09. 2008 2 102264 
5. Special remarks 
 
-  The best dyebath stability is achieved by : 
 - cold dyeing (25 °C) 
 - a pH not below 5.5 
 - a high dye concentration (3 g/l). 
 
-  Unsealed dyeing can be skipped with nitric acid. 
 
 -  The dyebaths are sensitive to sulphate and aluminium; anodized objects should therefore be 
   rinsed thoroughly before dyeing.  
 
-  Water sealing lightens the 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 the dyebaths 
 
Spent dyebaths can be readily precipitated with Anodal® WT-1 Liquid. The method is 
described in detail in the Technical Information bulletin for Anodal® WT-1 Liquid. 
 
The table below shows the additions required for precipitating Sanodure® Green LWN. 
 
Precipitation FeCl3, 40 % Etching Anodal
® WT-1 Residual dye Residual Cr 
method lye Liquid  in filtrate  in filtrate 
ml/g dye ml/g dye ml/g dye mg/l mg/l   
A 2,0 - 0,9 < 1 < 0,05 
B 2,0 - 0,9 < 1 < 0,05 
C  2,0 1,6 < 1 < 0,05 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
Many of their dyestuffs, pigments and chemicals are patented by Clariant in numerous industrial countries. 
® Trademark of Clariant registered in numerous countries. 
®* Trademark registered in numerous countries and licensed to Clariant. 
®+ Other Manufacturer's registered trade mark 
The signs ®, ®* and ®+ appear only at the first mention of the product. 
The information and recommendations presented here were compiled with the utmost care, but cannot be extended to cover 
every possible case. They are intended to serve as non-binding guidelines and must be adapted to the prevailing conditions.