ASTM-B970 › Standard Test Method for Cleanliness of Powder Metallurgy (PM) Bearings and Structural Parts (Withdrawn 2016)
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1.1 This test method covers a quantitative procedure to determine the cleanliness of PM bearings and structural parts.
1.2 This is a laboratory test consisting of cleaning sample parts under controlled conditions and calculating the amount or percent of residue from the mass of the removed contaminants.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
Significance and Use
Residue on a bearing may be detrimental to its longevity due to abrasive wear.
Residue on structural parts may affect the fit of assemblies or disturb the performance of the entire piece of equipment via excess friction or wear.
Part producers can utilize this procedure to determine the cleanliness of their processes. High residue levels on sintered parts may indicate a lubricant removal problem. Residue levels may also indicate the condition of various fluids used in part processing.
This test method can be applied when required by the user or internally for process engineering or quality control/compliance purposes by the producer.
bearings ; cleanliness; contamination; filtration; Residue; ICS Number Code 21.100.01 (Bearings in general)
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Nov. 1, 2009