This document specifies a method for the determination of the particle size distribution of coating powders by sieve analysis. Particle size distributions with a maximum of less than 100 µm is determined by laser diffraction, ISO 8130-13. This method is used especially for determining the oversize material or for the presence of contamination and can be used as a quality control procedure ("go"/"no go" test) by checking the amount retained on a single sieve. The following particle sizes are typical for coating powders, however the particle size can deviate depending on the application: — thin-film technology: 1 µm to 63 µm; — electrostatic coating: 10 µm to 200 µm; — fluidizing-bed method: 100 µm and above. NOTE Sieves with a mesh size smaller than 32 µm are not practical and are likely to become blind during use.
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
7 Choice of sieving method and sieve selectivity
8 Preparation of the test sieve
9 Procedure
9.1 Number of determinations
9.2 Manual sieving (with mesh sizes greater than 100 µm)
9.3 Machine sieving using an air-jet sieve apparatus
9.4 Machine sieving using vibration mechanism
10 Expression of results
11 Precision
12 Test report
Annex A Nominal sizes of test sieves (informative)
ISO 15528:2013 Paints, varnishes and raw materials for paints and varnishes -- Sampling
ISO 3310-1:2016 Test sieves -- Technical requirements and testing -- Part 1: Test sieves of metal wire cloth
ISO 3310-2:2013 Test sieves -- Technical requirements and testing -- Part 2: Test sieves of perforated metal plate
ISO 15528:2013 Paints, varnishes and raw materials for paints and varnishes -- Sampling
ISO 3310-1:2016 Test sieves -- Technical requirements and testing -- Part 1: Test sieves of metal wire cloth
ISO 3310-2:2013 Test sieves -- Technical requirements and testing -- Part 2: Test sieves of perforated metal plate
ISO 565:1990 Test sieves -- Metal wire cloth, perforated metal plate and electroformed sheet -- Nominal sizes of openings
ISO 8130-14:2019 Coating powders -- Part 14: Vocabulary