ASTM D4898 Test Method for Insoluble Contamination of Hydraulic Fluids by Gravimetric Analysis
1. Scope
1.1 This test method covers the determination of insoluble contamination in hydraulic fluids by gravimetric analysis. The contamination determined includes both particulate and gel-like matter, organic and inorganic, which is retained on a membrane filter disk of pore diameter as required by applicable specifications (usually 0.45 µm or 0.80 µm).
1.2 To indicate the nature and distribution of the particulate contamination, the gravimetric method should be supplemented by occasional particle counts of typical samples in accordance with Test Method F312.
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. For a specific warning statement, see 6.1.
2. Referenced Documents
2.1 ASTM Standards:
A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
D1836 Specification for Commercial Hexanes
D2021 Specification for Neutral Detergent, 40 Percent Alkylbenzene Sulfonate Type (Withdrawn 2000)
E319 Practice for the Evaluation of Single-Pan Mechanical Balances
F302 Practice for Field Sampling of Aerospace Fluids in Containers
F303 Practices for Sampling for Particles in Aerospace Fluids and Components
F312 Test Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters
F314 Methods of Test for Identification of Metallic and Fibrous Contaminants in Aerospace Fluids (Withdrawn 1990)
2.2 Military Standard:
MIL-C-81302C Cleaning Compound Solvent Trichlorotrifluoroethane
