AS 3715:2002 pdf – Metal finishing- -Thermoset powder coatings for architectural applications of aluminium and aluminium alloys

AS 3715:2002 pdf – Metal finishing- -Thermoset powder coatings for architectural applications of aluminium and aluminium alloys.
2.5 REQUIREMENTS FOR THE POWDER COATING
2.5.1 Appearance
The coating on significant surfaces shall be of uniform appearance. colour and texture and be free of excessive scratches which penetrate through to the base metal.
For all viewing situations a minimum of I metre shall apply provided that further distance be allowed commensurate with the use of the product and its in-situ viewing distances.
NOTE: It is strongly recommended that the manufacturer or supplier and customer agree appropriate standards of acceptance for the presence. size or frequency of any coating defects (such as deficiencies in colour, uniformity oR texture, or the presence of scratches). Appropriate standards may take the form of acceptable type samples of methods of test.
2.5.2 Specular gloss
When measured in accordance with ISO 2813, using a 60-degree exposure head, the specular gloss shall not vary by more than ±7 gloss units from the nominated value.
2.5.3 Coating thickness
The average coating thickness on significant surfaces, measured in accordance with AS 2331 .1 .4 shall be a minimum of 60 microns. The thickness of the coating on each part to he tested shall he measured at not less than five measuring areas of approximately I cm2 with three to five separate readings taken at each area. The average of the separate readings taken at each one of the measuring areas gives a measurement value to be recorded. None of the values measured shall be less than 80% of the specified minimum average value of 60 microns.
2.5.4 Cure test (SoIent resistance method)
Solvent resistance tests have been developed to differentiate between cured, partly-cured and under-cured powder coatings. The cure test (degree of softening or double-rub test) shall be performed in accordance with the powder coating supplier’s instructions and the results always compared with the supplier’s standard cured panel representing the same system under evaluation.
2,5.5 Adhesion (Cross-cut)
A coated test sample shall be tested for adhesion in accordance with ISO 2409. The appearance of the surface of the cross-cut area shall be no worse than Classification 0 of that Standard.
2.5.6 Huchholz hardness
When a test sample is tested in accordance with ISO 2815, the hardness of the coating shall have a minimum rating of 80. This test shall be performed on coatings that are approximately 70 ±12 um thick.
2.5.7 humidity resistance
When a scribed coated lest sample is exposed to 100% relative humidity at 40 ±3°C for 1000 h. in accordance with ASINZS 4506. and is assessed for blistering and creep from the scribe, it shall comply with the requirements of Table 2.1.
2.5.8 Rverse impact resistance
A coated tcst sample shall be capable of withstanding an impact energy of 2.5 N.m when carried out in accordance with Appendix H. with no sign of detachment following the tape pull test. This test shall be performed on coatings that are approximately 60 ±12 um thick.