ASTM F313 Test Method for Insoluble Contamination of Hydraulic Fluids by Gravimetric Analysis
Hydraulic systems depend upon clean fluids to convey power while not damaging sensitive components or clogging filters. This method gravimetrically (by weight) determines solid and gel-like insoluble contaminants in hydraulic fluids.
The sample is well agitated and vacuum filtered. The quantity of residual matter is determined gravimetrically and viewed under magnification to identify larger particles. Reported is the amount of insoluble material in mg per 100ml and any observations of interest.
Note: This test is considered obsolete by ASTM and has been replaced by ASTM D4898. It is still offered by Petro-Lube as a service to our clients.