Main Standards and Tests in INDUSTRIAL PAINTING

MAIN STANDARDS AND TESTS IN INDUSTRIAL PAINTING The market demands increasingly advanced products in terms of strength and durability. This means that the products must meet a number of specifications, standards and tests. The specifications outline the tests to be carried out and under which standard. MAIN STANDARDS IN INDUSTRIAL PAINTING ISO STANDARD ASTM STANDARD AFO STANDARD In Europe the ISO standard is used but there are also other standards such as ASTM or AFO. One of the most commonly used standards that appears in the specifications is ISO 12944. This standard establishes a series of salt spray chamber and humidity chamber test hours for each corrosiveness category. Let us now see the most usual tests in paints and under which standard they are performed. MAIN STANDARDS AND TESTS SALT SPRAY ISO 9227: In this test, the paint test cards are subjected to the continuous projection of a 5% sodium chloride solution with a pH between 6.5 and 7.2. The paint test cards are incised to cause the onset of corrosion. These paint test cards are assessed every few hours according to ISO 4628. ADHESION TEST: there are two types of test under two different standards. ISO 2409 LATTICE CUTTING TEST It consists in making two crossed cuts with a comb that has a special blade. Depending on the thickness of the film, we will use one blade or another. 12. Thickness between 0 and 60 microns: comb with 1 millimetre separation between blades. 13. Thickness between 60 and 120 microns: comb with 2 millimetres of separation between blades. 14. Thickness from 120 to 250,000: 3 millimetres comb between blades. 15. Depending on the amount of paint that is lifted there is a category ranging from 0 to 5 depending on the percentage. 16. ISO 4624 TENSILE TEST: it consists in placing dollies glued on the surface to be tested, which are then removed at a controlled speed. The result is expressed in mega pascals. 17. ISO 6270 HUMIDITY CHAMBER TEST: The test consists in assessing resistance under high humidity conditions. 18. It consists of a temperature-controlled enclosure with a distilled water tank that is electrically heated to saturation. 19. The paint test cards are assessed every few hours according to ISO 4628. Failures can be blistering, decolouration, choking, etc. 20. WEATHERING RESISTANCE TEST: in order to accelerate these tests, accelerated ageing tests are used. 21. ISO 16474-2 XENOM 22 ISO 16474-3 UV CHAMBER 23. In this test, the paint test cards are subjected to cycles of exposure to type a or b lamps and humidity. 24. Different lamps are used and the test time and temperature of each cycle also varies depending on the specification. For example, four hours of ultraviolet at 60 degrees and 4 hours of condensation at 50 degrees. 25. ISO 45545 REACTION TO FIRE TEST: this is a very common test in the railway sector where a series of tests are established depending on the part of the train to be painted.