ASTM D2070-91(1996)

Standard Test Method for Thermal Stability of Hydraulic Oils

SCOPE
1.1 This test method is designed primarily to evaluate the thermal stability of hydrocarbon based hydraulic oils although oxidation may occur during the test.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-2000
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants

Relations

• Replaced By: ASTM D2070-91(2001) - Standard Test Method for Thermal Stability of Hydraulic Oils
• Effective Date: 01-Jan-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: D 2070 – 91 (Reapproved 1996) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Thermal Stability of Hydraulic Oils
This standard is issued under the fixed designation D 2070; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope are reported for informational purposes. No correlation of the
test to field service has been made.
1.1 This test method is designed primarily to evaluate the
thermal stability of hydrocarbon based hydraulic oils although
5. Apparatus
oxidation may occur during the test.
5.1 An aluminum block with equally spaced holes is used.
1.2 The values stated in SI units are to be regarded as the
An example is described in Fig. A1.1 of Annex A1.
standard.
5.2 Electric gravity convection oven capable of maintaining
1.3 This standard does not purport to address all of the
the aluminum block at a test temperature of 135°C 6 1°C.
safety concerns, if any, associated with its use. It is the
5.2.1 Calibrated thermocouple and temperature indicator
responsibility of the user of this standard to establish appro-
centered in aluminum block.
priate safety and health practices and determine the applica-
5.3 250 mL Griffin beakers of borosilicate glass.
bility of regulatory limitations prior to use.
5.4 Copper test specimens are to be UNS C11000, 99.9 %
2. Referenced Documents pure electrolytic tough pitch copper, 6.35 mm in diameter by
7.6 cm in length (0.25 in. by 3.0 in.).
2.1 ASTM Standards:
5.5 Steel test specimens are to be AISI W-1 1 % carbon
D 4057 Practice for Manual Sampling of Petroleum and
steel, 6.35 mm in diameter 7.6 cm in length (0.25 by 3.0 in.).
Petroleum Products
5.6 Silicon carbide abrasive 320 grit with cloth backing.
2.2 Copper Development Association Standard
5.7 Crocus cloth.
UNS C11000 Electrolytic Tough Pitch Copper
5.8 No. 41 Whatman filter paper, 47 mm diameter.
2.3 American Iron and Steel Institute Standard (AISI)
5.9 Millipore filter, 8 micron Type SC, 47 mm diameter.
W-1 Carbon Tool Steel
5.10 Millipore glass filter holder, 47 mm, Cat #XX10.04700
or equivalent.
3. Summary of Test Method
5.11 Cincinnati Milacron color chart.
3.1 A beaker containing test oil, copper and iron rods is
5.12 25 mL pipette.
placed in an aluminum block in an electric gravity convection
oven for 168 h at a test temperature of 135°C. At the
6. Reagents
completion of the test, the copper and steel rods are rated
6.1 Reagent Grade Heptane—Warning, Flammable.
visually for discoloration and the oil is analyzed for the
Health hazard.
quantity of sludge.
6.2 Reagent Grade Acetone—Warning, Flammable,
Health hazard.
4. Significance and Use
4.1 Thermal stability characterizes physical and chemical
7. Preparation of Apparatus
property changes which may adversely affect an oil’s lubricat-
7.1 Handle the rods at all times using forceps or clean cotton
ing performance. This test method evaluates the thermal
gloves.
stability of a hydraulic oil in the presence of copper and steel
7.2 Catalyst preparation—Clean the iron and copper cata-
at 135°C. Rod colors are the evaluation criteria. Sludge values
lyst rods, whether new or previously used, prior to use. Clean
the rods with the 320 silicon carbide abrasive cloth while
rotating the rods in a drill chuck at 1700 to 1800 r/min. Clean
This test method is under the jurisdiction of ASTM Committee D-2 on
the surface until it has a bright copper or steel appearance.
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
D02.N0.08on Stability. Discard rods when diameter is less than 6.2 mm.
Current edition approved May 15, 1991. Published December 1991.
This procedure was adopted from the Cincinnati Milacron Thermal Stability
Test, Cincinnati Milacron Manual 10-SP-89050.
3 6
Annual Book of ASTM Standards, Vol 05.02. Whatman Int. Ltd., Maidstone, England.
4 7
Available from Copper Development Assoc., 2 Greenwich Office Park, Box Millipore Filter Corp., Bedford, MA.
1840, Greenwich, CT 06836. Cincinnati Milacron, 4701 Marburg Ave., Dept 97B Lubricants and Tribology,
Available from AISI, 1133 15th St., NW, Washington, DC 20005. Cincinnati, Ohio, 45209, 513-841-8660.
D 2070
7.3 Prepare surface finally with a crocus cloth. Remove all mL of oil. Therefore, the weight of the original filter paper is
grind marks. Finish the rods to a lightly polished surface finish. subtracted from the dried filter paper plus residue and the
7.4 Wash the rods individually with acetone and air dry on difference divided by two. The weight of the sludge on the 8
completion of the polishing operation. micron Millipore filter pad is also reported as milligrams per
100 mL. The weight of the original filter pad is subtracted from
8. Procedure
the weight of the dried residue plus filter pad and the difference
8.1 Place a representative 200-mL sample of test oil multiplied by four. Total sludge is the summation of the sludge
obtained per D4057 – 88 sampling procedure in a clean
...