Propriedades de borracha – Método de teste padrão para dureza 1- O método de teste envolve A, B, C, D, FAZER, E, M, Ó, 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.
Significado e Propósito
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.

Escopo de
1.1 The test method covers twelve types of rubber hardness measuring equipment called durometers: type A, B, C, D, FAZER, E, M, Ó, OO, OOO, OOO-S and R. Procedures for determining the indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) borracha, 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 “Propriedades de borracha – Método de teste padrão para dureza 1- (Diauroc) Testador de dureza”

1.5 Valores expressos em unidades do SI devem ser considerados valores padrão. Os valores dados entre parênteses são apenas para referência. 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 Esta norma não se destina a abordar todas as questões de segurança, caso existam, associado ao seu uso. É responsabilidade do usuário desta norma estabelecer medidas de segurança apropriadas, práticas de saúde e ambientais e para determinar a aplicabilidade de restrições regulatórias antes do uso.

1.7 Esta Norma internacional foi desenvolvida de acordo com os princípios de padronização internacionalmente reconhecidos estabelecidos na Decisão sobre Princípios para o Desenvolvimento de Normas Internacionais, Diretrizes e recomendações emitidas pelo Comitê sobre Barreiras Técnicas ao Comércio da Organização Mundial do Comércio.