The test method for powder coatings serves two purposes: 1. performance reliability; 2. quality control
(1) Gloss test (ASTM D523)
Test coated slabs with Gardener 60 degrees. Coatings shall not vary + or - 5% from each material's data sheet requirements.
(2) Bending test (ASTM D522)
Coating on .036" thick phosphated steel should withstand 180 degree bends over a 1/4" mandrel. Cracks or adhesion and finish in bends will not be removed using 3M Y-9239 Tape .
(3) Hardness test (ASTM D3363)
Faber Castell Wooden Pencils have a hardness of 1,2,3,4,. The coating should show no traces of 2H pencil.
(4) Paint film cross-cut method (ASTM D3359)
Scribe parallel lines through the coating onto the substrate, 1/4 inch apart at 1 inch distances. Divide another set of parallel lines 1/4" and perpendicular to the first set. Apply any tape and remove slowly. The result should be no lifting of the cured powder between the scribes.
(5) Chemical resistance test (ASTM D1308)
About 10 drops of a test solvent consisting of 95% by weight toluene and 5% by weight Methal Ethyl Keytone are placed on the coating surface. Let it sit for 30 seconds. Wipe with a soft dry cloth. The coating should show no more than a slight round mark.
(6) Impact test (ASTM D2794)
Coatings on 0.036" thick phosphated steel shall withstand direct and reverse impacts of 26" lbs with a 1/2" Gardener impact Tester ball. No grazing or loss of adhesion using 3M Y-9239 Tape, no Remove the surface in the impact area.
