ASTM D4636-17 PDF

Full title and description

Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft Turbine Engine Lubricants, and Other Highly Refined Oils — designation ASTM D4636-17. This test method describes accelerated laboratory procedures that expose formulated lubricating fluids to elevated temperature, air (moist or dry), and metal specimens to evaluate oxidation resistance, corrosiveness to common metals, and formation of degradation products (sludge, viscosity change, increased acid number). DOI: 10.1520/D4636-17.

Abstract

ASTM D4636-17 provides a controlled, accelerated oxidative/corrosive environment to assess how hydraulic fluids, aircraft turbine engine lubricants, and other highly refined petroleum or synthetic oils resist oxidation and corrode representative metal surfaces. The method includes a standard procedure plus two alternative procedures; key outputs include metal appearance (corrosion), mass changes, viscosity shifts, acid number, and sludge formation under specified test times, temperatures, air flow and humidity.

General information

• Status: Superseded / replaced by ASTM D4636-25 (2025); D4636-17 remains a historical edition.
• Publication date: Current edition approved June 1, 2017; published June 2017 (designated D4636-17).
• Publisher: ASTM International.
• ICS / categories: 75.100 (Lubricants, industrial oils and related products).
• Edition / version: D4636-17 (edition approved 2017).
• Number of pages: 11 pages.

Scope

This test method covers laboratory procedures to determine the resistance of hydraulic oils, aircraft turbine engine lubricants, and other highly refined oils to oxidation and corrosion degradation and to evaluate their tendency to corrode representative metal specimens. The method can be run with moist or dry air, uses elevated temperature and agitation to accelerate reactions, and contains options (Procedure 1 and Procedure 2) to suit differing specification requirements. Interpretation is intended by comparison to oils with known field performance.

Key topics and requirements

• Accelerated oxidation test conditions: elevated temperature and air agitation to simulate service-related oxidation.
• Use of metal specimens (common system metals) to assess corrosiveness and catalytic effects on oxidation.
• Measurement endpoints: metal appearance/corrosion, mass change, viscosity change, acid number increase, sludge or insolubles, and oil mass loss.
• Alternative procedures to tailor variables (test time, airflow, humidity, sample frequency, sample quantity, metal types).
• Suitable primarily for oils containing oxidation and corrosion inhibitors; severe test conditions may produce drastic changes in uninhibited fluids.

Typical use and users

Used by lubricant manufacturers, formulation chemists, quality control laboratories, aerospace and hydraulic system engineers, and procurement/specification writers who need to evaluate or compare oxidation resistance and corrosiveness of lubricants under accelerated conditions. Also used by defense and aerospace agencies for qualification and by testing labs that provide comparative performance data.

Related standards

Referenced and related ASTM methods and standards commonly used with D4636 include viscosity and acidity test methods (for example ASTM D445 for kinematic viscosity, ASTM D664 for acid number), water/reagent specifications (ASTM D1193), and other lubricant oxidation/aging tests. D4636 historically incorporated features from Federal Test Methods (e.g., former Methods 5307.2 and 5308.7). Users should consult the current D4636 edition and referenced standards for exact cross-references.

Keywords

oxidation stability, corrosiveness, hydraulic oil, turbine engine lubricant, lubricant testing, metal corrosion, acid number, sludge formation, accelerated oxidation, ASTM D4636.

FAQ

Q: What is this standard?

A: ASTM D4636-17 is a standardized laboratory test method for assessing corrosiveness and oxidation stability of hydraulic oils, aircraft turbine engine lubricants, and other highly refined oils under accelerated conditions.

Q: What does it cover?

A: It covers procedures that expose oil samples (with or without metal specimens) to elevated temperature and air (moist or dry) to accelerate oxidation and observe corrosive effects, measuring endpoints such as metal appearance, mass change, viscosity, acid number, and sludge. The method includes the standard procedure plus two alternatives to suit different specification needs.

Q: Who typically uses it?

A: Lubricant formulators and manufacturers, independent test laboratories, aerospace and hydraulic system engineers, procurement/specification teams, and defense/aerospace agencies for product qualification and comparative performance testing.

Q: Is it current or superseded?

A: D4636-17 is a 2017 edition; it has been superseded by a later edition, ASTM D4636-25 (published 2025). Users requiring the current test procedure should refer to the D4636-25 edition. D4636-17 remains a historical edition and may be referenced for legacy data.

Q: Is it part of a series?

A: D4636 is maintained under ASTM Committee D02 (Petroleum Products, Liquid Fuels, and Lubricants), Subcommittee D02.09.0D (Oxidation of Lubricants). The D4636 designation has multiple editions (for example D4636-14, D4636-17, and the later D4636-25). It also cross-references other ASTM lubricant test methods used for complementary measurements.

Q: What are the key keywords?

A: Oxidation stability; corrosiveness; hydraulic oil; turbine engine lubricant; lubricant aging; metal corrosion; acid number; sludge; accelerated test; ASTM D4636.