Patent ID: 6057002
Filing Date: 2000-05-02
Classification: F16L

Abstract:
A method of protecting from corrosion the junction between adjoining plastics coated metal pipes comprising roughening the exposed surface of the plastics coatings on either side of the junction region, applying a primer on the abraded region of the plastics coating, allowing or causing the primer to cure or dry, and subsequently applying over the said junction region and over the regions primed with said primer, a protective top coat wherein the protective top coat comprises a base component comprising 30 to 70 percent by weight of polyalcohol, 0.5 to 5 percent by weight of aromatic polyamine, 0 to 10 percent by weight of iron oxide, 10 to 20 percent by weight of barium sulfate, 5 to 15 percent by weight magnesium aluminium sulphate, and 5 to 15 percent by weight potassium sodium alumino silicate and an activator component comprising polyisocyanate based on diphenylmethane diisocyanate.