ASTM B 312 : 2009

1.1 This standard covers a test method that may be used to measure the transverse rupture strength of a compacted but unsintered (green) test specimen produced from lubricated or unlubricated metal powders or powder mixtures.

1.2 Green strength is measured by a quantitative laboratory procedure in which the fracture strength is calculated from the force required to break an unsintered test specimen supported as a simple beam while subjected to a uniformly increasing three-point transverse load under controlled conditions.

1.3 This test method is a companion standard to Test Method B 528 that covers the measurement of the transverse rupture strength of sintered PM test specimens.

1.4 With the exception of density values, for which the g/cm³ unit is the industry standard, and mass measurements used to calculate density, the values stated in inch-pound units are to be regarded as the standard. The SI equivalents shown in parentheses have been converted in accordance with IEEE/ASTM Standard SI 10, may be approximate and are only included for information.

1.5 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. ^REFERENCE:

ASTM Standards:

B 215 Practices for Sampling Metal Powders

B 243 Terminology of Powder Metallurgy

B 528 Test Method for Transverse Rupture Strength of Metal Powder Specimens

B 925 Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens

B 962 Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle

E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

SI 10 American National Standard for Use of the International System of Units (SI): The Modern Metric System