Signification et objectif
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.

Champ d'application
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

Méthode A — Knoop indentation hardness 6-12

Méthode 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 Dureté d'indentation des revêtements organiques

1.4 Test Method A of these test methods is similar in content (mais pas techniquement équivalent) to ISO 6441-1 et ISO 6441-2.

1.5 Les valeurs exprimées en unités SI ou en unités pouces-livres doivent être considérées comme des normes., respectivement. Les valeurs spécifiées dans chaque système peuvent ne pas être exactement les mêmes; Donc, chaque système doit être utilisé indépendamment. La combinaison des valeurs des deux systèmes peut conduire au non-respect des critères.

1.6 This standard is not intended to address the safety issues, si seulement, associé à son utilisation. Il est de la responsabilité des utilisateurs de cette norme d'établir des mesures de sécurité appropriées., pratiques sanitaires et environnementales et pour déterminer l’applicabilité des restrictions réglementaires avant utilisation.

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 (OTC) Committee of the World Trade Organization on the Formulation of International standards, guidelines and recommended principles.