المعنى والغرض
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.

نطاق
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

الطريقة أ — Knoop indentation hardness 6-12

الطريقة ب – 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 صلابة المسافة البادئة للطلاءات العضوية

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

1.5 Values expressed in SI units or inch-pound units shall be considered standards, على التوالى. قد لا تكون القيم المحددة في كل نظام هي نفسها تمامًا; لذلك, وينبغي استخدام كل نظام بشكل مستقل. Combining the values of both systems may lead to non-compliance with the criteria.

1.6 ليس المقصود من هذا المعيار معالجة قضايا السلامة, لو اي, المرتبطة باستخدامه. تقع على عاتق مستخدمي هذه المواصفة القياسية مسؤولية تحديد السلامة المناسبة, الممارسات الصحية والبيئية وتحديد إمكانية تطبيق القيود التنظيمية قبل الاستخدام.

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, المبادئ التوجيهية والمبادئ الموصى بها.