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Recommended Procedure for Stripping and Ascertaining Coating Weight of Plascoat PPA 571/Plascoat PPA 571ES on Fencing Wire

It is sometimes required - particularly for quality checks to meets ASTM fencing standards to remove the PPA 571 coating to ascertain the coating thickness. Obviously PPA 571 is designed to adhere permanently to the wire so it is difficult to remove for weighing. However the following procedure is recommended:

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.

SA/15/11/02