This standard specifies methods for determining the non-volatile content of paints, varnishes, bases for paints and varnishes, polymer dispersions and polycondensation resins such as phenolic resins (resol, novolac, etc.). This standard also applies to dispersions containing pigments, fillers and other additives (such as thickening additives and film-forming additives). This standard can also be used for unplasticized polymer dispersions and latex, whose non-volatile residues (mainly polymeric materials and a small amount of additives such as emulsifiers, protective colloids, stabilizers, solvents added as film-forming additives, In particular, preservatives used in latex concentrates) should be chemically stable under test conditions. For plasticizable samples, the non-volatile residue usually includes the plasticizer. Note l: The non-volatile content of the sample is not an absolute quantity and depends on the heating temperature and time used in the measurement. Therefore, when using this method, due to solvent retention, thermal decomposition and volatilization of low molecular weight components, the obtained non-volatile residue content is only a relative value rather than a true value. Therefore, this method is mainly used for different batches of similar products. test. Note 2: This method is applicable to synthetic latex, as long as the heating time is appropriate (IS0 124 stipulates that the mass loss of a 2 g sample during heating should be less than 0.5 mg during two consecutive heating periods). Note 3: Methods for determining non-volatile matter usually also include drying using infrared or microwave radiation. Since these methods are not universal, these methods cannot be standardized. Some polymer components may decompose under these processing conditions and give erroneous results. IS0 3233:1998 Paints and varnishes determine the volume fraction of non-volatile matter by measuring the dry coating density. It specifies a method for determining the volume fraction of non-volatile matter in paints, varnishes and related products.
ISO 3251:2003 history
2019ISO 3251:2019 Paints, varnishes and plastics — Determination of non-volatile-matter content
2008ISO 3251:2008 Paints, varnishes and plastics - Determination of non-volatile-matter content
2003ISO 3251:2003 Paints, varnishes and plastics - Determination of non-volatile-matter content
1993ISO 3251:1993 Paints and varnishes; determination of non-volatile matter of paints, varnishes and binders for paints and varnishes
1974ISO 3251:1974 Paint media — Determination of volatile and non-volatile matter