GB/T 20624.2-2006 in English

《GB/T 20624.2-2006色漆和清漆 快速变形（耐冲击性）试验 第2部分：落锤试验（小面积冲头）》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。
本部分规定了用一直径为12.7mm或15.9mm的球形冲头撞击涂层及底材而引起其快速变形并对变形结果进行评定的试验方法。 当采用数值结果时，本试验方法再现性较差，故限定在同一实验室内进行试验。如用等级评定代替数值结果可以提高实验室之间的一致性。

1 Scope

This Part of GB/T 20624 describes a method for rapidly deforming, by impact with a spherical indenter of diameter 12.7 mm or 15.9 mm, a coating film and its substrate and evaluating the effect of such deformation.
Note: The term “impact resistance” is included in the title and text of this Part, but one important characteristic of the apparatus used is that it should produce rapid deformation rather than a true impact.
This test method should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 20624. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.