BS EN 13523-6:2020 pdf free.Coil coated metals – Test methods Adhesion after indentation (cupping test).
BS EN 13523-6 Make an attempt to pull the strips of the organic coating away from the metallic substrate in each of the four directions, starting from the central square. Lift the end of the strips with the kmife (51). then pull with the pincers (5.4) until the rupture of the strip. Observe the extent of the peeling and express in percentage of the distance between the top and the base of the dome. If ageing is carried out, express the adhesion as a percentage of peeling for the ageing period. 8.5.2 For coatings less than 60 pum thickness Remove two complete laps from a reel of the adhesive tape (5.6) and discard. Remove an additional length at a steady rate and cut a piece, approximately 75 mm long. Place the centre of the tape over the lattice in a direction parallel to one set of the cuts and smooth the tape into place over the area of the lattice and for a distance of at least 20 mm beyond. To ensure good contact with the coating, rub the tape firmly with a fingertip. The colour of the coating seen through the tape is a useful indication of overall contact. Within 1 min of applying the tape, remove the tape by holding the free end and pulling it off steadily in 0,5sto 1 s at an angle that is as close as possible to 60° (see also EN ISO 2409:2013, A.2) to the panel. Assess the degree of adhesion after removal of the adhesive tape. Retain the tape for reference purposes, for example by ataching it to a sheet of transparent film. 8.6 Assessment of cracking (optional) Assess the degree of cracking on the dome of deformation with the x 10 magnifying glass (5.5]. If cracking is observed, the indentation depth shall be reduced and the test repeated until no cracking is observed.BS EN 13523-6 pdf download.