ASTM D1275-96a
(Test Method)Standard Test Method for Corrosive Sulfur in Electrical Insulating Oils
Standard Test Method for Corrosive Sulfur in Electrical Insulating Oils
SCOPE
1.1 This test method covers the detection of corrosive sulfur compounds in electrical insulating oils of petroleum origin.
1.2 Mineral insulating oils may contain substances that cause corrosion under certain conditions of use. This test method is designed to detect the presence of free sulfur and corrosive sulfur compounds by subjecting copper to contact with oil under prescribed conditions.
1.3 The values stated in inch-pound units are to be regarded as the standard.
1.4 This standard does not purport to address 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.
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Designation: D 1275 – 96a
315/98
Standard Test Method for
Corrosive Sulfur in Electrical Insulating Oils
This standard is issued under the fixed designation D 1275; 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.
This standard has been adopted for use by government agencies to replace Method 5328-2 of Federal Test Method Standard No. 791b.
This standard was adopted as an ASTM-IP Standard.
1. Scope quantity and type of corrosive agent and time and temperature
factors. Detection of these undesirable impurities, even though
1.1 This test method covers the detection of corrosive sulfur
not in terms of quantitative values, is a means for recognizing
compounds in electrical insulating oils of petroleum origin.
the hazard involved.
1.2 Mineral insulating oils may contain substances that
cause corrosion under certain conditions of use. This test
4. Apparatus
method is designed to detect the presence of free sulfur and
4.1 Bath—A hot-air oven or oil bath provided with suitable
corrosive sulfur compounds by subjecting copper to contact
means of heating to, and controlling at, 140 6 2°C. A
with oil under prescribed conditions.
circulating hot-air oven is preferred.
1.3 The values stated in inch-pound units are to be regarded
4.2 Containers—Narrow-mouth, 250-mL, ground-glass
as the standard. SI units are included for informational pur-
stoppered flasks, of chemically resistant glass, capable of
poses.
holding 270 to 280 mL when filled completely to the stopper.
1.4 This standard does not purport to address the safety
Flasks of such capacity are required in order to allow sufficient
concerns, if any, associated with its use. It is the responsibility
space for expansion of the oil.
of the user of this standard to establish appropriate safety and
4.3 Electrolytic Sheet Copper, 0.127 to 0.254 mm (0.005 to
health practices and determine the applicability of regulatory
0.010 in.) in thickness.
limitations prior to use.
4.4 Polishing Material, consisting of 240-grit silicon car-
2. Referenced Documents bide paper or cloth, and also 230-mesh silicon carbide grains
and pharmaceutical absorbent cotton.
2.1 ASTM Standards:
D 130 Test Method for Detection of Copper Corrosion from
NOTE 1—It should be noted that 240-grit silicon carbide paper and
Petroleum Products by the Copper Strip Tarnish Test 230-mesh silicon carbide grains have particle sizes of about the same size
(63 μm). In the United States, abrasive papers are classified in accordance
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
with ANSI B 74.10. Abrasive powders are classified by ASTM mesh size.
poses
2.2 Other Document:
5. Reagents
ANSI B74.10 Grading of Abrasive Microgrits
5.1 Acetone, cp.
3. Significance and Use 5.2 Nitrogen Gas— Commercial cylinders of nitrogen gas
are satisfactory for this purpose.
3.1 In most of their uses insulating oils are continually in
contact with metals that are subject to corrosion. The presence
6. Preparation of Apparatus
of corrosive sulfur compounds will result in deterioration of
6.1 Chemically clean flasks with solvents to remove oil;
these metals. The extent of deterioration is dependent upon the
then wash the flasks with phosphate-type cleaning powder.
Rinse with tap water, then with distilled water, and dry in an
This test method is under the jurisdiction of ASTM Committee D-27 on
oven.
Electrical Insulating Liquids and Gasesand is the direct responsibility of Subcom-
6.2 Cut a strip of copper 6 by 25 mm ( ⁄4 by 1 in.) (Note 2)
mittee D27.06 on Chemical Tests.
and remove blemishes from surfaces with the 240-grit silicon
Current edition approved Dec. 10, 1996. Published February 1997. Originally
published as D 1275 – 53. Last previous edition D 1275 – 96. carbide paper. Strips may be stored in sulfur-free acetone at this
Annual Book of ASTM Standards, Vol 05.01.
point for future use. Do the final polishing of the strip by
Annual Book of ASTM Standards, Vols 04.02 and 14.02.
removing it from the acetone, holding it in the fingers protected
Available from American National Standards Institute, 1430 Broadway, New
with ashless filter paper, and rubbing with 230-mesh silicon
York, NY 10018.
Copyright © ASTM, 100 Barr
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