ASTM D 8120 : 2025

1.1This test method describes a means for quantitative determination of the concentration of ferrous debris in lubricants and greases.

1.2This test method provides a determination of the concentration of ferrous debris in the lubricant or grease from a nominal 0 mg/kg to 10 000 mg/kg (1 % by mass) or greater.

1.3This test method is applicable to all types of lubricating fluids (API Group I-V) and greases sampled from machinery and other mechanical equipment, including reciprocating engine oils, turbine oils, hydraulic oils, gear oils, and bearing greases.

1.4This test method describes a means by which a sample of lubricant or grease is placed in a magnetometer apparatus, which determines the concentration of ferrous debris and provides these readings directly to the operator without further calculation.

1.5This test method is applicable to in-service lubricants and greases at any stage of degradation.

1.6The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.