ASTM A1102-16 PDF

Scope: 1.1 This specification covers technically important, commercially available, magnetically hard sintered (fully dense) permanent magnets commonly known as samarium cobalt. These materials are available in two general composition families abbreviated “SmCo 1:5” and “SmCo 2:17.” The numbers indicate the approximate atomic ratio of samarium to the sum of other constituents. (Refer to Appendix X3 for additional composition information.)

1.2 Samarium cobalt magnets have approximate magnetic properties of residual magnetic induction, B_r, from 0.78 T (7800 G) to 1.18 T (11 800 G) and intrinsic coercivity, H_cJ, typically greater than 800 kA/m (10 000 Oe). Special grades and isotropic (un-aligned) magnets can have properties outside these ranges (see Appendix X4). Specific magnetic hysteresis behavior (demagnetization curve) can be characterized using Test Method A977/A977M.

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) units which are provided for information only and are not considered standard.

1.4 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.

ASTM A1102-16 Referenced Document

ASTM A340 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing
ASTM A977/A977M Standard Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hysteresigraphs

2019 ASTM A1102-19 Standard Specification for Sintered Samarium Cobalt (SmCo) Permanent Magnets
2016 ASTM A1102-16 Standard Specification for Sintered Samarium Cobalt (SmCo) Permanent Magnets