ISO 8130-12:2019 pdf free.Coating powders -Determination of compatibility.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 1514, Paints and varnishes — Standard panels for testing
Iso 2813, Paints and varnishes — Determination of gloss value at 20°, 600 and 85°
ISO 8 130-14, Coating powders — Part 14: Vocabulary
ISO 13076, Paints and varnishes — Lighting and procedure for visual assessments of coatings
Iso 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
ISO 183 14-1, Analytical colorimetry — Part 1: Practical colour measurement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8130-14 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
The coating powders are mixed together in a range of ratios and each mixture is applied to standard
test panels, stoved and the surface inspected for evidence of incompatibility.
5 Apparatus
Ordinary laboratory apparatus, together with the following:
5.1 Clean and degreased steel or aluminium panels, as specified in ISO 1514, with holes drilled at
one end for hanging.
5.2 Powder application system, either electrostatic spraying or fluidizing bed.
5.3 Suitable clean container, capable of holding a mass of the powder for processing in the powder
application system (51).
NOTE Plastic bags have been found to be suitable for non-metallic powders.
5.4 Balance, accurate to 10 rng.
5.5 Oven, capable of stoving the coated test panels.
6 Sampling
Prepare a representative sample of the powder under test, as specified in ISO 15528. The quantity of powder required will depend on the powder application system (5.2).
NOTE A quantity of between 50 g and 200 g is normally suitable for each test.
7.2 Place each of the samples prepared in Li. in a clean container (5) and agitate for sufficient time to ensure complete homogenization.
NOTE Vigorous shaking by hand of a partially filled container for 15 s to 30 s has proved to be adequate.
7.3 Spray each of the mixed samples onto a test panel (5,1), using the powder application system (52), to a thickness appropriate for the end application.
powder required will depend on the powder application system (5.2).
NOTE A quantity of between 50 g and 200 g is normally suitable for each test.
8 Expression of results
A comparative visual description of the coatings (see Clause 1) will be the first assessment for the purposes of this standard method.
In cases the initial assessment is not conclusive then tests listed below can be followed. Depending on necessary requirements, different test methods can be used.
— Change in gloss level: gloss measurement as specified in ISO 2813.
— The presence of pinholes: further tests using a wet-sponge method with a correct voltage relevant for the coating thickness.
NOTE A suitable method is described in ASTM D5162111.
— The appearance of the coating eg orange peel: visual inspection as specified in ISO 13076 or instrumental based evaluation of changing appearance on a sample in correlation to its reference point. Instrumental evaluation can only be done with the same instrument and may not be comparable between laboratories.
— The presence of craters: visual inspection as specified in ISO 13076 or an optical microscope.
— The presence of graininess: visual inspection as specified in ISO 13076 or an optical microscope.
The presence of contamination: for contamination with particles use visual inspection with the correct viewing distance; for colour contamination then use a suitable analytical colorimetry as specified in ISO 18314-1.ISO 8130-12 pdf download.