ASTM D4898-23 PDF
Name in English:
St ASTM D4898-23
Name in Russian:
Ст ASTM D4898-23
Original standard ASTM D4898-23 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Insoluble Contamination of Hydraulic Fluids by Gravimetric Analysis — ASTM D4898-23 specifies a gravimetric membrane‑filtration procedure for determining the amount of insoluble contamination (particulate and gel‑like matter, organic and inorganic) present in hydraulic fluids. The method quantifies contamination retained on a membrane filter disk and includes guidance to examine filters microscopically for large particles or fibers.
Abstract
This test method covers determination of insoluble contamination in hydraulic fluids by passing a measured quantity of fluid through a membrane filter (commonly 0.45 µm or 0.80 µm pore size) and measuring the increase in filter mass. The gravimetric result is intended to indicate bulk contamination levels and is normally supplemented by particle‑count or particle‑size assessment methods for more detailed particulate characterization.
General information
- Status: Active standard.
- Publication date: 2023 (current edition designated D4898‑23; last editorial update noted in late 2023).
- Publisher: ASTM International.
- ICS / categories: 75.120 (Hydraulic fluids / lubricants).
- Edition / version: D4898‑23 (revises D4898‑16).
- Number of pages: 4 pages (short test method).
Scope
ASTM D4898‑23 specifies a laboratory gravimetric procedure to determine insoluble contamination retained on a membrane filter when a known volume of hydraulic fluid is drawn through the filter by vacuum. The method captures both particulate and gel‑like contaminants and is intended to provide a mass‑based indication of contamination; it does not replace particle counting/size distribution methods but may be used alongside them for a fuller contamination assessment. Units are SI; users should follow applicable safety and environmental practices when performing the test.
Key topics and requirements
- Gravimetric determination of insoluble contamination by membrane filtration (typical filter pore sizes 0.45 µm or 0.80 µm).
- Preparation, conditioning, and weighing of membrane filter disks before and after sample filtration to obtain contamination mass.
- Microscopic inspection of filter disks for excessively large particles, fibers, or unusual material.
- Recommendation to supplement gravimetric results with particle counts or size distribution methods (referenced particle test method).
- Reporting of results in SI units and consideration of applicable specification pore sizes and sample volumes.
Typical use and users
Commonly used by lubricant and hydraulic‑fluid testing laboratories, quality control groups in hydraulic equipment manufacturing and maintenance organizations, field service laboratories, and purchasers/specifiers of hydraulic fluids who require a routine, mass‑based indicator of insoluble contamination to support cleanliness control and preventative maintenance programs.
Related standards
Referenced or historically related documents include the prior edition ASTM D4898‑16, supplemental particle‑count or particle‑size methods (referenced in the text), and several military and industry cleaning/contamination specifications that address hydraulic fluid cleanliness. The standard’s historical lineage includes redesignation from older test method identifiers in related fluid‑analysis series.
Keywords
insoluble contamination, hydraulic fluids, gravimetric analysis, membrane filtration, filter disk, particulate contamination, particle count, lubrication cleanliness.
FAQ
Q: What is this standard?
A: ASTM D4898‑23 is a standard test method that describes a gravimetric membrane‑filtration procedure to quantify insoluble contamination (mass of particulates and gel‑like matter) in hydraulic fluids.
Q: What does it cover?
A: It covers sample filtration through a membrane filter, conditioning and weighing the filter before and after filtration, microscopic inspection for large particles or fibers, and reporting of contamination mass (with SI units). It is intended as a bulk contamination indicator and is normally supplemented by particle counting/size methods.
Q: Who typically uses it?
A: Testing laboratories, hydraulic equipment manufacturers, maintenance and reliability teams, fluid suppliers, and quality assurance/specification engineers responsible for hydraulic fluid cleanliness and component longevity.
Q: Is it current or superseded?
A: The D4898‑23 edition is the current (active) edition as of 2023 and supersedes the previous D4898‑16 edition. Users should confirm they hold the latest edition before applying the method.
Q: Is it part of a series?
A: Yes — it is maintained by ASTM Committee D02 (Hydraulic Fluids and related subcommittees) and is related to other ASTM fluid‑analysis and particle‑characterization methods; it forms part of the suite of hydraulic‑fluid cleanliness and lubricant test procedures.
Q: What are the key keywords?
A: Insoluble contamination, hydraulic fluid, gravimetric analysis, membrane filter, particulate, cleanliness, particle count.