英文名称：

ASTM D785-15

Standard Test Method for Rockwell Hardness of 

Plastics and Electrical Insulating Materials

中文名称：

ASTM D785-15

塑料及电子绝缘材料洛氏硬度标准试验方法

代号说明：

This standard is issued under the fixed designation D785; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the U.S. Department of Defense.

版本说明：

1 This method is under the jurisdiction ofASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.

Current edition approved Oct. 1, 2015. Published October 2015. Originally approved in 1944. Last previous edition approved in 2008 as D785 - 08. DOI: 10.1520/D0785-08R15.

2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.

3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036,http://www.ansi.org.

标准正文：

1. Scope

1.1 This test method covers two procedures for testing the indention hardness of plastics and related plastic electrical insulating materials by means of the Rockwell hardness tester.

1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

NOTE 1—This test method and ISO 2039-2 are equivalent. Procedure A of this test method is equivalent to the test method in the main body of ISO 2039-2. Procedure B of this test method is equivalent to the test method in the integral annex part of ISO 2039-2.

2. Referenced Documents

2.1 ASTM Standards: 

D618 Practice for Conditioning Plastics for Testing

D883 Terminology Relating to Plastics

D2240 Test Method for Rubber Property—Durometer Hardness

D4000 Classification System for Specifying Plastic Materials

E18 Test Methods for Rockwell Hardness of Metallic Materials

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

2.2 ISO Standards 

ISO 2039-2 Plastics—Determination of Hardness—Part 2: Rockwell Hardness

3. Terminology

3.1 Definitions used in this test method are in accordance with Terminology D883.

3.2 Definitions of Terms Specific to This Standard:

3.2.1 indentation hardness—the resistance of a material to surface penetration or plastic deformation.