GB/T 1725-2007 in English

《GB/T 1725-2007色漆、清漆和塑料 不挥发物含量的测定》由TC5（全国涂料和颜料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
本标准规定了测定色漆、清漆、色漆与清漆用漆基、聚合物分散和缩聚树脂如酚醛树脂（可熔酚醛、线性酚醛树脂等）的不挥发物含量的方法。本标准也适用于含有颜料、填料和其他助剂（如增稠助剂和成膜助剂）的分散体。本标准也能用于未增塑的聚合物分散体和胶乳，其不挥发剩余物在试验条件下应化学稳定。对可增塑的样品，不挥发剩余物通常包括增塑剂。

1 Scope

This standard specifies a method for determining the non-volatile-matter content by mass of paints, varnishes, binders for paints and varnishes, polymer dispersions and condensation resins such as phenolic 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 and rubber latices, the non-volatile residue (which consists essentially of the polymeric material and of small quantities of auxiliaries such as emulsifiers, protective colloids, stabilizers, solvents added as film-forming agents and - especially for rubber latex concentrate - preserving agents) has to be chemically stable under the test conditions. For plasticized samples, the non-volatile residue normally includes the plasticizer.
NOTE 1: The non-volatile-matter content of a sample is not an absolute quantity but depends upon the temperature and period of heating used for the determination. Consequently, when using this method, only relative and not true values of the non-volatile-matter content are obtained owing to solvent retention, thermal decomposition and evaporation of low-molecular-mass constituents. The method is therefore primarily intended for testing different batches of the same type of product.
NOTE 2: This method is suitable for synthetic rubber latices provided heating for a specific period of time is considered appropriate (ISO 124 specifies heating until the loss in mass of a 2g test portion following successive periods of heating is less than 0.5mg).
NOTE 3: The 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 tend to decompose during such treatment and therefore give incorrect results.
“Paints and Varnishes - Determination of Percentage Volume of Non-volatile Matter by Measuring the Density of a Dried Coating (ISO 3233:1998)” specifies a method for determining the volume of non-volatile matter in paints, varnishes and related products.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 3186-2006 Paints Varnishes and Raw Materials for Paints and Varnishes - Sampling (ISO 15528: 2000, IDT)

Foreword I
1 Scope
2 Normative References
3 Term and Definition
4 Apparatus
5 Sampling
6 Procedure
7 Supplementary Test Conditions
8 Expression of Results
9 Precision
10 Test Report