BS EN 13523-20:2020 pdf free.Coil coated metals – Test methods,Foam adhesion.
BS EN 13523-20 This document describes a laboratory method for testing foam adhesion to an organic coating on a metallic substrate under dry and wet conditions.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.EN 13523-0, Coil coated metals一Test methods一Part 0: General introduction.Organic insulation material created by mixing polyols and isocyanates to make (for example) polyurethane (PUR) or polyisocyanurate (PIR) foams.Mixing and handling of foams shall be carried out in line with the foam manufacturer’s recommendations.NOTE In the industrial process of sandwich panel manufacture, the constituent liquids of the foam are mixed just prior to application, which then expand rapidly to fill the gap between two outward facing sheets of coated metal, usually in a continuous process or the hollow space in a profile, at least partly formed by coated metal in a discontinuous process. (e.g. production of refrigerators).Cut the samples of coated metal sheet into pieces of approximately 200 mm x 250 mm.Mix the components of the foam together in a blender, according to the supplier’s specification (for example 20 g polyol and 26 g isocyanate, during 10 s). Pour a small quantity of the mixture over the surface to be tested. As the mixture reacts immediately, the application of the mixture shall be done within 20 s after mixing, unless otherwise specified by the supplier.After the application, leave the samples under ambient conditions, for 30 min to 40 min or as otherwise specified, before testing as described below. If at the coating/foam interface none of the original coating surface is revealed after the boiling test, put a second sample as described in 9.1 in the humidity cabinet (100 % relative humidity at 40 °C] for 24 h. After removal of excess water, pull off the foam (by hand). If at the coating/foam interface none of the original coating surface is revealed, wet adhesion is reported as “pass”.BS EN 13523-20 pdf downlaod.