Sifat karet – Metode uji standar untuk Kekerasan 1- Metode pengujian melibatkan A, B, C, D, MELAKUKAN, E, M, HAI, OO, OOO, OOO-S and R 12 (Diauroch) hardness tests and procedures for determining the indentation hardness of substances according to the classification of rubber, net materials, elastic materials, thermoplastic materials and certain hard plastics.
Arti dan Tujuan
4.1 The test method is based on the penetration of a specific type of indentation when forced into the material under specific conditions. Indentation hardness is inversely proportional to penetration and depends on the elastic modulus and viscoelastic behavior of the material. The geometry of the indenter and the forces applied can affect the measurements, so there is no simple relationship between the measurements obtained using one hardness tester and those obtained using another hardness tester or other instruments used to measure hardness. The test method is an empirical test primarily used for control purposes. There is no simple relationship between the indentation hardness determined by this test method and any basic characteristics of the tested material. For specification purposes, it is recommended that test method D785 be used for materials other than those described in 1.1.

Ruang lingkup
1.1 The test method covers twelve types of rubber hardness measuring equipment called durometers: type A, B, C, D, MELAKUKAN, E, M, HAI, OO, OOO, OOO-S and R. Procedures for determining the indentation hardness of substances classified as thermoplastic elastomers, vulcanized (termoset) karet, elastomeric materials, porous materials, gel-like materials and certain plastics are also described.

1.2 This test method is not equivalent to other indentation hardness methods and instrument types, in particular those described in Test Method D1415.

1.3 This test method is not applicable to the test of coated fabrics.

1.4 All materials, instruments or equipment used to determine mass, force or size shall be traceable to the National Institute of Standards and Technology or other internationally recognized organization of a similar nature.

ASTM D 2240-2021 “Properti Karet – Metode Uji Standar Kekerasan 1- (Diaurok) Penguji Kekerasan”

1.5 Nilai yang dinyatakan dalam satuan SI harus dianggap sebagai nilai standar. Nilai yang diberikan dalam tanda kurung hanya untuk referensi. Many of the stated dimensions in SI were translated directly from the US customary system to fit instruments, practices, and procedures that existed prior to the 1975 Metric Conversion Act.

1.6 Standar ini tidak dimaksudkan untuk mengatasi semua masalah keselamatan, jika ada, terkait dengan penggunaannya. Pengguna standar ini bertanggung jawab untuk menetapkan keselamatan yang sesuai, praktik kesehatan dan lingkungan dan untuk menentukan penerapan pembatasan peraturan sebelum digunakan.

1.7 Standar internasional ini telah dikembangkan sesuai dengan prinsip-prinsip standardisasi yang diakui secara internasional yang ditetapkan dalam Keputusan Prinsip-Prinsip Pengembangan Standar Internasional, Pedoman dan Rekomendasi yang dikeluarkan oleh Komite Hambatan Teknis Perdagangan Organisasi Perdagangan Dunia.