標準號：BS EN ISO 3251-2008
中文標準名稱：涂料、清漆和塑料.非揮發物質含量的測定
英文標準名稱：Paints, varnishes and plastics. Determination of non- volatile-matter content
標準類型：G51
發布日期：2008/3/31 12:00:00
實施日期：2008/3/31 12:00:00
中國標準分類號：G51
國際標準分類號：83.080.01;87.040;87.060.20
適用范圍：This International Standard specifies a method for determining the non-volatile-matter content by mass ofpaints, varnishes, binders for paints and varnishes, polymer dispersions and condensation resins such asphenolic resins (resols, novolak solutions, etc.).The method is also applicable to formulated dispersions containing fillers, pigments and other auxiliaries (e.g.thickeners and film-forming agents). For the method to be usable for unplasticized polymer dispersions andrubber latices, the non-volatile residue (which consists essentially of the polymeric material and of smallquantities of auxiliaries such as emulsifiers, protective colloids, stabilizers, solvents added as film-formingagents and — especially for rubber latex concentrate — preserving agents) has to be chemically stable underthe test conditions. For plasticized samples, the residue, by definition, normally includes the plasticizer.NOTE 1 The non-volatile-matter content of a product is not an absolute quantity but depends upon the temperatureand period of heating used for the determination. Consequently, when using this method, only relative and not true valuesfor non-volatile-matter content are obtained owing to solvent retention, thermal decomposition and evaporation of lowmolecular mass constituents. The method is therefore primarily intended for testing different batches of the same type ofproduct.NOTE 2 This method is suitable for synthetic rubber latices provided heating for a specific period of time is consideredappropriate (ISO 124 specifies heating until the loss in mass of a 2 g test portion following successive periods of heating isless than 0,5 mg).NOTE 3 In-house methods for determining non-volatile matter often include drying with infrared or microwave radiation.Standardization of such methods is not possible, since they are not generally applicable. Some polymer compositions tendto decompose during such treatment and therefore give incorrect results.ISO 3233 and ISO 23811 specify methods for determining the volume of non-volatile matter in paints,varnishes and related products.