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DIN Standards Committee Coatings and Coating Materials

Overview

This part of DIN EN ISO 3233 specifies a method for determining the non-volatile matter by volume, NV_V, of coating materials and related products by measuring the density of a dried coating for any specified temperature range and period of drying or curing. Using the non-volatile matter by volume results obtained in accordance with this part of DIN EN ISO 3233, it is possible to calculate the spreading rate of coating materials. The method specified in this part of DIN EN ISO 3233 is the preferred method for air-drying materials. Its use for other materials still has to be tested. This part of DIN EN ISO 3233 is not applicable to coating materials in which the critical pigment volume concentration is exceeded. This method is used to measure the density and to determine the volume of a dry coating obtainable from a given volume of liquid paint. This volume is considered to be the most meaningful measure of the coverage (area of surface covered at a specified dry-film thickness per unit volume) of a paint, varnish or related product. The value obtained by this method might not be the same as that calculated on the basis of the addition of masses and volumes of the raw materials in a formulation. The volume occupied by a combination of resin and solvent can be the same as, greater than or less than the combined volume of the separate components, due to contraction or expansion of the resin and solvent. A second factor affecting the volume of a dry coating formulation is the degree to which the spaces between pigment particles are filled with binder. A third factor is the use of volatile components in reactive systems that, by their reaction, change into non-volatile film-building materials, that is, amines or reactive solvents in high-build two-component coating materials. Above the critical pigment volume concentration, the volume of a dry paint film is greater than the theoretical volume, due to the increase of unfilled voids between pigment particles. The porosity of the film means that this method is unsuitable. The values obtained for the non-volatile matter by volume are dependent on the temperature and time of heating, and these conditions should be carefully considered for the material being tested. The committee responsible for this standard is NA 002-00-07 AA "Allgemeine Prüfverfahren für Beschichtungsstoffe und Beschichtungen" ("General test methods for coating materials and coatings") at DIN.

Document: references other documents

Responsible national committee

NA 002-00-07 AA - General test methods for coating materials and coatings  

Responsible european committee

CEN/TC 139/WG 9 - Testing of coil coated metals