Význam a použití
5.1 The test method determines the coverage of the test coating by visually evaluating the sprayed coating.
Poznámka 1 Test method D2805 describes an instrumental method for determining coverage. Apply the film to a uniform thickness (např. with a scraper), measure the film thickness strictly, and determine the opacity by photometry. Thus the concealment force can be determined with high precision.
5.2 Test method D6762 is not as accurate as test method D2805, but it is widely used because it is closely related to the application characteristics of paints and is simpler in terms of concept and evaluation.
ASTM D6762-2018 “Stanovení kryvosti nátěrů vlastním hodnocením stříkaných konstrukčních nátěrů”
Krok 1: Rozsah
1.1 This test method enables quantitative visual determination of the film thickness required for complete coverage. The film thickness is considered to test the coating’s hiding power.
1.2 The method is applicable only to sprayed coatings, but the concept can also be applied to other applications.
1.3 Values expressed in inches to pounds shall be treated as standard values. The values given in brackets are mathematical conversions of SI units for reference only and are not considered as standards.
1.4 This standard is not intended to address all safety issues associated with its use. Je odpovědností uživatelů této normy zajistit odpovídající bezpečnost, zdravotní a environmentální postupy a určit použitelnost regulačních omezení před použitím.
1.5 This international standard is based on internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Směrnice a doporučení vydané Výborem WTO pro technické překážky obchodu (TBT).
ASTM D6762-2018 “Stanovení kryvosti nátěrů vlastním hodnocením stříkaných konstrukčních nátěrů”
2. Refer to the file
ASTM standard
D16 Paints, terms related to coatings, materials and applications
Practice of preparing cold rolled steel plates for testing paints, laky, conversion films and related coating products
D1005 Test method for dry film Thickness of organic coatings using a micrometer
D1729 Visual evaluation of diffuse reflection of opaque materials for color and chromatic aberration practice
Method for preparing D1730 coated aluminum and aluminum alloy surfaces
D2805 Test method for Covering power of coatings by reflection
D7091 Nondestructive measurement of dry film thickness for non-magnetic coatings for ferrous metals and for non-magnetic, non-conductive coatings for ferrous metals
E691 Practice of conducting interlaboratory studies to determine the accuracy of test methods