Technical Resources Area |
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Technical Resources Area |
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Sometimes it is necessary to remove a coating from a metal substrate. In such cases, because Plascoat PPA 571 adheres very well to the component, it is necessary to tackle the task with care. The metal part must not be damaged and presumably will require to be re-coated at a later date.
A clean method of removing PPA 571 and other coatings is using the hot sand fluid bed technique.
One manufacturer is:
Seghers, Gentsesteenweg 311, B-9240 Zele, Belgium.
Tel: +32(0)9 367 9494
Recommended Procedure for Stripping and Ascertaining Coating weight of Plascoat PPA 571/Plascoat PPA 571ES
1. Place coated sample in 50% Rinse Aid solution at 80°C for 72 hours.
(Note: Making a few cuts through the coating to the metal surface prior to immersion with help to release the coating).
2. Strip any coating remaining attached to the substrate and then remove the substrate.
3. Filter the Rinse Aid solution containing the stripped coating through filter paper.
4. Retaining the stripped coating in the filter paper, flush through with boiling water to remove any residue.
5. Dry the stripped coating at 80°C in an oven for a minimum of one hour and then weigh.
Note: Tests conducted by Plascoat have shown that Zinc-coated (i.e. galvanised) substrates do not suffer any weight loss in 50% Rinse Aid solution at 80°C.
The simplest way to remove unwanted coatings is to burn them off in a hot oven, set at a temperature that will not cause any problems to the metalwork. Care must be taken to ensure compliance with all the local regulations concerning the emission of fumes. Fumes should be vented away safely. After burning off the coating, the metalwork should be grit blasted clean.
SA/15/11/02
Repairing Plascoat PPA 571 coatings
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Plascoat Systems Ltd. Trading Estate, Farnham, Surrey GU9 9NY, UK Tel: +44 (0) 1252 733777, Fax: +44 (0) 1252 721250 email: sales@plascoat.com |
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