BS/EN 13523-6-2020 pdf download.Coil coated metals – Test methods-Part 6 : Adhesion after indentation ( cupping test).
EN 23270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and testing (ISO 3270)
EN 60454-2, Specification for pressure-sensitive adhesive tapes for electrical purposes — Part 2:
Methods of test
EN ISO 1520, Paints and varnishes — Cupping test (ISO 1520)
3 Terms and definitions
For the purposes of this document, the terms and definitions given In EN 13523-0 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— I EC Electroped ia: available at http://www.electropedia.orgJ
— ISO Online browsing platform: available at https://wwwjso.org/obp
4 Principle
The test specimen is cross-hatched with a cutting tool and is then deformed by pressing under specified conditions. After pressings the test specimen can be artificially aged by immersion in boiling water.
5 Apparatus and materials
5.1 Cross-hatching device
A single-bladed knife, very sharp to avoid any burrs. For coatings less than 60 pm in thickness, it is also possible to use a purpose-made cutting tool, capable of making a minimum of six parallel cuts.
5.2 Pressing device
Apparatus in accordance with EN ISO 1520, consisting essentially of:
a) a steel die, of inside diameter (27 ± 0,05) mm, its contact surface with the test specimen being flat and polished;
b) a retaining ring, having its flat and polished surface in contact with the test specimen;
c) an indenter consisting of a polished steel sphere, of diameter (20 ± 0,05) mm with a maximum of 0,1 mm displacement from the axis of the die;
d) a system, preferably hydraulic, allowing movement of the indenter at a speed of (12 ± 6) mm/mm.
The ageing device shall consist of:
a) a vessel, to contain boiling water, whose dimensions allow the complete immersion of the test specimen;
b) a heating system.
5.4 Pincers, the jaws of which shall be flat, blunt and having a width of at least 5 mm.
5.5 Magnifying glass x 10.
5.6 Transparent pressure-sensitive adhesive tape, 25 mm wide, with an adhesion strength of (10 ± 1) N per 25 mm width when tested in accordance with EN 60454-2.
6 Sampling
Sampling shall be in accordance with EN 13523-0.
7 Test panels
Preparation and conditioning of test panels shall be in accordance with EN 13523-0.
8 Procedure
8.1 Ambient conditions
Measure the coating adhesion at ambient temperature. For more accurate measurements, as required
for instance In case of dispute, the temperature shall be (23 ± 2) °C and the relative humidity (50 ± 5) %,
in accordance with EN 23270.
8.2 Cross-hatching (not used for evaluation of resistance to cracking)
8.2.1 For coatings greater than or equal to 60 tm thickness (see Figure 1)
Make two parallel cuts 5 mm apart, together with two additional similar cuts at right angles to lorm a
central 5 mm x 5 mm square.
Each cut shall just reach the metallic substrate, and each cut shall measure at least 50 mm In length. Each cut shall be at a distance of not less than 20 mm from the edge of the test panel.
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 knife (5.1) then pull with the pincers (54) 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 pm thickness
Remove two complete laps from a reel of the adhesive tape (5.fi) 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 mm of applying the tape, remove the tape by holding the free end and pulling it off steadily in
0,5 s to I s at an angle that is as close as possible to 600 (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 attaching 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 ().
If cracking is observed, the indentation depth shall be reduced and the test repeated until no cracking
is observed.
9 Expression of results
9.1 For coatings greater than or equal to 60 pm thickness
Express the results as the percentage of the distance between the top and the base of the dome for peeling.
9.2 For coatings less than 60 pm thickness
Express the results as the percentage of cross-hatched squares removed after taping.BS/EN 13523-6-2020 pdf download.