Kahulugan at Layunin
3.1 For more than half a century, the Sward type hardness rocker instruments have been used by the coating industry as NDE instruments to measure the cured and final surface hardness of organic coatings (tingnan sa Mga Sanggunian). (1) through (2)). This test method can be used in the laboratory to quickly screen and measure the surface hardness of candidate coatings.

Tala 1: In a previous task group aimed at establishing an ASTM method for measuring the hardness of organic coatings using a Sward type hardness rocker arm instrument, cyclic test results consistently showed poor inter-laboratory reproducibility. The lack of inter-laboratory agreement may be caused by dimensional differences between instruments, and in this regard contact with the rocker arm ring is a very likely violator. Several manufacturers of the Sward type hardness rocker produce instruments that vary in net weight and ring radius. Some of them exceed the measured values and net weights required in this test method.

ASTM D 2134-93-2019 Determination of Hardness of Organic Coatings with a Swalt-type Hardness Tester

Saklaw ng
1.1 The test method covers the determination of the relative degree of surface hardness of organic coatings using specific equipment used in the coating industry.

1.2 Values expressed in SI units shall be regarded as standards. Ang mga halaga na ibinigay sa mga panaklong ay para sa sanggunian lamang.

1.3 This test method is not intended to address all safety issues, kung meron man, na nauugnay sa paggamit nito. Responsibilidad ng gumagamit ng pamantayang ito na magtatag ng angkop na kaligtasan, mga kasanayan sa kalusugan at kapaligiran at upang matukoy ang pagiging angkop ng mga paghihigpit sa regulasyon bago gamitin.

1.4 Ang internasyonal na Pamantayang ito ay binuo alinsunod sa mga internasyonal na kinikilalang prinsipyo ng standardisasyon na itinatag sa Desisyon sa mga Prinsipyo para sa Pag unlad ng Internasyonal na Pamantayan, Mga Patnubay at Rekomendasyon na inilabas ng Komite sa mga Teknikal na Hadlang sa Kalakalan ng World Trade Organization.