Developed by the International Organization for Standardization (ISO), this part of the ISO 6272 standard specifies the resistance of a dry paint, varnish or related product film to cracking or peeling from a substrate when dropped under standard conditions, subject to deformation caused by a falling weight. Describes a method for evaluating on an indentation.
-testleri---bolum-2:-dusen-agirlik-testi-kucuk-alan-girintisi.jpg "ISO 6272-2 Paints and Varnishes - Rapid Deformation (Impact Resistance) Tests - Part 2: Drop Weight Test, Small Area Indentation")
The terms "impact" and "shockproof" are used in the title and text of ISO 6272-2, but an important feature of the apparatus used is that it produces rapid deformation rather than a true impact.
Due to the poor reproducibility of this test method, the method should be limited to testing in a laboratory only when results are expressed as numerical values. Interlaboratory agreement is improved when sequencing is used instead of numeric values.
The tested coatings are applied to suitable thin metal panels. After coatings have cured, a distance is reduced such that a standard weight strikes a recess that deforms the coating and substrate. By gradually increasing the distance the weight falls, the point at which the failure begins can often be determined where it occurs. Films often fail by cracking, which can be done with a magnifying glass, by applying a solution of copper sulfate (CuSO4) to the steel, or using a pinhole detector.
Coatings adhered to substrates are subject to damaging impacts during the manufacture and use of the articles. Over many years of use, this test method for impact resistance has been found to be useful in estimating. The performance of organic coatings is evaluated for their ability to resist cracking caused by such effects.
Attention is drawn to the possibility that some elements in this part of ISO 6272 may be the subject of patent rights. ISO cannot be held responsible for the determination of any or all such patent rights.
Among the services provided by our organization within the framework of material testing services, there are also ISO 6272-2 standard tests.
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