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Help CenterPaint Stripper-Gardostrip 5628A, Gardostrip Activator (from Chemetall Chemicals)
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Gardostrip 5628A, Gardostrip Activator
Product Description
Gardostrip 5628A is a paint stripping system to remove polyester powder paint from aluminium, zinc and steel surfaces. It is free from chlorinated hydrocarbons, phenols and cresols. Gardostrip 5628A may also remove other paints, but is specifically designed for polyester. The action of Gardostrip 5628A on polyester is to completely dissolve the resin, releasing the pigments into the solution for removal. Other paints will be lifted from the surface but not dissolved.
Features and Benefits
• Operates from ambient to 600 C
• Fast stripping times
• Methylene chloride free
• Safe on all metals
• Long solution life
• Low operating costs
Components
Gardostrip 5628A
Gardostrip Activator
Directions for Use
The paint stripper is used by immersion. Operating temperature is ambient to 600 .C (maximum). Agitation (by stirrer or circulation pump) is desirable to ensure uniformity but not essential.
Heating should be available to maintain performance as the solution becomes contaminated.
Paint residues may be removed by filter press or filter bags. Efficient filtration is considered essential for the product to perform cost-effectively.
Water must be excluded from the stripper tank. Work must enter dry.
Gardostrip 5628A is used to maintain the bath volume and Gardostrip Activator is
added initially, and as required, to maintain chemical attack on polyester powdercoat. Gardostrip Activator is consumed during the stripping process, and additions are
calculated according to a simple test procedure.
The solution remains non-etching towards aluminium as long as water content is minimised. Gardostrip Activator is a water-free alkali additive which does not cause water build-up in the solution. The alternative to Gardostrip Activator, Gardostrip 5628LA-1, is a water-containing alkali concentrate which may only be used under specific circumstances.
Application of the Paint Stripper:- Bath Make Up:
Per 1000 litres of bath volume
1000 litres of Gardostrip 5628A
50 kg (35 litres) of Gardostrip Activator.
Gardostrip Activator is a corrosive liquid. Take care when adding to the tank.
Bath Operation:
Immersion time: 5-60 minutes. Time may be longer depending on the
temperature and age of the bath.
Bath Temperature: 20-60oC (normally 40oC)
Operation at temperatures above 60 deg.C. will result in an unacceptable level of fumes, odours , and solution loss through evaporation.
Bath Control:
Alkalinity Titration or Titration Points: To be performed at every shift.
1. Take a 5 ml sample of the bath
2. Add 25 ml water and a few drops of phenolphthaleine indicator The solution will turn pink.
3. Titrate with 0.1N acid until the pink colour disappears.
Mls = titration pointage.
A new solution will have a Pointage of 7-8 Pointage should be maintained at 7 - 15.
Add 2.5 litres (3.5kg) of Gardostrip Activator per 1000 litres to raise the pointage by 1.0
Material Handling
Equipment should be constructed of general purpose constructional steels
The bath may be agitated by means of a recirculating pump or propeller stirrer
Or the work can be moved in the solution using a rotating barrell, rocking cam, air ram or similar arrangement.
The circulating solution is abrasive, and can damage mechanical pump seals in time
Seal-less pumps, such as magnetic drive, or “vertical” pumps (with submerged impeller and body) are preferred. Mechanical seals which have a carbon face should not be
used. Ceramic is preferred.
Consult Chemetall for equipment suitable for your process.
A filter (filter press or bag filter) is desirable to remove paint residues in order to
minimise wastage of the product in the form of wet sludge. Filter cake in the order of 30-50% w/w solids should be achievable. Alternatively, the bath can be allowed to
settle periodically, and the settled sludge transferred to filter bags to drain.
Repainting
Care must be taken to ensure that metal stripped in Gardostrip is properly prepared before repainting.
Aluminium:- The stripping process for aluminium should include cleaning and etching in a caustic soda solution to remove all paint residues and the remains of any previous
chromate conversion coating. After rinsing, the aluminium must be reprocessed as for new aluminium.
Zinc (galvanised) :- Clean the stripped surface carefully by (for instance) water blasting. Ensure that the zinc coating is undamaged and not excessively darkened or powdery. Reprocess as for new zinc coated steel.
Steel:- Clean the stripped surface carefully by (for instance) water blasting. Protect from rusting by drying immediately and/or apply a suitable protective coating. Then clean and reprocess as for new steel.
The performance of any subsequently applied paint coating on a surface stripped with Gardostrip should be verified in all cases.
Packaging
Available in 25kg containers.
Safety, Transport and Storage Information Please refer to the Safety Data Sheet.
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