BS EN ISO 3251-2008 涂料、清漆和塑料.非挥发物质含量的测定

标准号：BS EN ISO 3251-2008
中文标准名称：涂料、清漆和塑料.非挥发物质含量的测定
英文标准名称：Paints, varnishes and plastics. Determination of non- volatile-matter content
标准类型：G51
发布日期：2008/3/31 12:00:00
实施日期：2008/3/31 12:00:00
中国标准分类号：G51
国际标准分类号：83.080.01;87.040;87.060.20
适用范围：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.