Semnificație și scop
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.

Scopul
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 Duritatea de indentare a acoperirilor organice

1.4 Test Method A of these test methods is similar in content (dar nu echivalent din punct de vedere tehnic) to ISO 6441-1 și ISO 6441-2.

1.5 Values expressed in SI units or inch-pound units shall be considered standards, respectiv. The values specified in each system may not be exactly the same; Prin urmare, each system should be used independently. Combining the values of both systems may lead to non-compliance with the criteria.

1.6 Acest standard nu este destinat să abordeze problemele de siguranță, dacă există, asociat cu utilizarea acestuia. Este responsabilitatea utilizatorilor acestui standard să stabilească siguranța corespunzătoare, practicile de sănătate și de mediu și pentru a determina aplicabilitatea restricțiilor de reglementare înainte de utilizare.

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, orientări și principii recomandate.