Význam a účel
4.1 Indentation hardness measurement has been shown to be useful for assessing the resistance of coatings on rigid substrates to mechanical damage, such as damage caused by striking, gouging and scraping. These measurements do not necessarily characterize the resistance of the coating to mechanical abuse, which needs to remain intact when deformed.

Pohled do
1.1 These test methods include the determination of indentation hardness of organic materials, such as dry lacquer, varnish and varnish coatings, when applied to acceptable flat rigid surfaces, such as metal or glass.

1.2 Covers the following two methods:

Part of

Metoda A — Knoop indentation hardness 6-12

Metoda B – Pfund indentation hardness 13-19

1.3 Method A has higher precision and provides hardness values in the form of Knoop hardness values (KHN). Method B provides hardness based on Pfund hardness value (PHN). Although these methods differ in the range of hardness values, they are consistent in their ranking of coating hardness.

ASTM D1474-2018 Vtisková tvrdost organických povlaků

1.4 Test Method A of these test methods is similar in content (but not technically equivalent) na ISO 6441-1 a ISO 6441-2.

1.5 Values expressed in SI units or inch-pound units shall be considered standards, respektive. Hodnoty uvedené v každém systému nemusí být úplně stejné; Proto, každý systém by měl být používán samostatně. Combining the values of both systems may lead to non-compliance with the criteria.

1.6 Tato norma není určena k řešení bezpečnostních problémů, jestli nějaký, spojené s jeho užíváním. Je odpovědností uživatelů této normy zajistit odpovídající bezpečnost, zdravotní a environmentální postupy a určit použitelnost regulačních omezení před použitím.

1.7 This international Standard has been developed in accordance with the internationally accepted standardization principles established in the decisions of the Technical Barriers to Trade (TBT) Committee of the World Trade Organization on the Formulation of International standards, pokyny a doporučené zásady.