Significance and Use

This test method indicates and measures the amount of insoluble contamination of hydraulic fluids. Minimizing the levels of insoluble contamination of hydraulic fluids is essential for the satisfactory performance and long life of the equipment. Insoluble contamination can not only plug filters but can damage functional system components resulting in wear and eventual system failure.

1. Scope

1.1 This test method covers the determination of insoluble contamination in hydraulic fluids by gravimetric analyses. 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 ? m or 0.80 ? m).

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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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

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

Military Standard

Keywords

Aerospace fluids/propellants; Contamination--petroleum products; Filters/filter procedures--petroleum analysis; Gravimetric determination; Insoluble matter content--petroleum products; Microscopic examination; Visual examination--petroleum products;

ICS Code

ICS Number Code 75.120 (Hydraulic fluids)

DOI: 10.1520/D4898-90R10E01

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ASTM D4898