ISO 28199-1:2021 pdf download.Paints and varnishes - Evaluation of properties of coating systems related to the spray application process
1 Scope
This document defines terms relating to the evaluation of coating materials in research, development and production with regard to their suitability and safety for industrial processes and error analysis.
This document also specifies methods for the preparation of test panels and the subsequent measurement of film thickness, colour, surface texture and other measurable surface properties.
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 1513, Paints and varnishes一Examination and preparation of test samples
ISO 2808, Paints and varnishes一Determination offilm thickness
ISO 3270, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning and testing
ISO 15528, Paints, varnishes and raw materials for paints and varnishes一Sampling
ISO 18314-1, Analytical colorimetry一Part 1: Practical colour measurement
ISO 28199-2, Paints and varnishes一Evaluation of properties of coating systems related to the spray application process- Part 2: Colour stability, process hiding power, re-dissolving, overspray absorption,wetting, surface texture and mottling
ISO 28199-3, Paints and varnishes一Evaluation of properties of coating systems related to the spray application process一Part 3: Visual assessment of sagging, formation of bubbles, pinholing and hiding power
3.1 bubble
closed or already burst blister in a layer, arising when solvents or cleavage products evaporate from chemical crosslinking
Note 1 to entry: If bubbles are caused by the process control, the formulation components or both, the viscosity of the paint film has increased too rapidly during the drying phase so that solvents or reaction products still in the paint film have built up at the polymer paint skin which forms, usually resulting in closed blisters and sometimes resulting in burst blisters. Discontinuities can be identified in more detail using a cross-section.
3.2 colour stability
non-variability, or variability within agreed tolerances, of colour despite variation of influencing factors
Note 1 to entry: Examples of influencing factors are thickness and application method.
3.5 overspray absorption
ability of a coating material already applied to absorb overspray particles of the same coating material resulting from a subsequent application
Note 1 to entry: Evidence of poor overspray absorption is shown, for example, by raised surface texture (3.12) and low colour stability (3.2) as well as mottling (3.4).
3.6 pinholing
presence of small holes in a film or coating resembling those made by a pin
Note 1 to entry: Pinholes can be caused by gas inclusions in the base coat that reveal a discontinuity after the application of the clear coating material. They are often the result of inappropriate process parameters. Pinholes are similar to craters and bubbles (3.1). Discontinuities can be identified in more detail using a cross-section.[SOURCE: ISO 4618:2014, 2.195, modified一Note 1 to entry added]
3.7 process hiding power
minimum thickness above which the complete coating system in combination with the colour of the complete substrate achieves colour stability (3.2) or the colour location achieves a value agreed by the interested parties
Note 1 to entry: See also“hiding power", defined in ISO 4618:2014, 2.138, as“ability of a coating material or a coating to obliterate the colour or the differences in colour of a substrate".ISO 28199-1 pdf download.