ASTM D1275-03
(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 – 03
315/98
Standard Test Method for
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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 Method5328-2 of Federal Test Method Standard No. 791b.
This standard was adopted as an ASTM-IP Standard.
1. Scope of corrosive sulfur compounds will result in deterioration of
these metals. The extent of deterioration is dependent upon the
1.1 This test method describes the detection of corrosive
quantity and type of corrosive agent and time and temperature
sulfur compounds (both inorganic and organic) in electrical
factors. Detection of these undesirable impurities, even though
insulating oils of petroleum origin.
not in terms of quantitative values, is a means for recognizing
1.2 Mineral insulating oils may contain substances that
the hazard involved.
cause corrosion under certain conditions of use. This test
method is designed to detect the presence of free sulfur and
4. Apparatus
corrosive sulfur compounds by subjecting copper to contact
4.1 Bath—Ahot-air oven or oil bath provided with suitable
with oil under prescribed conditions.
means of heating to, and controlling at, 140 6 2°C. A
1.3 The values stated in inch-pound units are to be regarded
circulating hot-air oven is preferred.
as the standard. SI units are included for informational pur-
4.2 Containers—Narrow-mouth, 250-mL, ground-glass
poses.
stoppered flasks, of chemically resistant glass, capable of
1.4 This standard does not purport to address the safety
holding 270 to 280 mL when filled completely to the stopper.
concerns, if any, associated with its use. It is the responsibility
Flasks of such capacity are required in order to allow sufficient
of the user of this standard to establish appropriate safety and
space for expansion of the oil.
health practices and determine the applicability of regulatory
4.3 Copper Foil, 99.9+ % pure,, 0.127 to 0.254 mm (0.005
limitations prior to use.
to 0.010 in.) in thickness.
2. Referenced Documents 4.4 Polishing Material, consisting of 240-grit silicon car-
bide paper or cloth, and also 230-mesh silicon carbide grains
2.1 ASTM Standards:
and pharmaceutical absorbent cotton.
D 130 Test Method for Detection of Copper Corrosion from
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Petroleum Products by the Copper Strip Tarnish Test
NOTE 1—It should be noted that 240-grit silicon carbide paper and
E 11 Specification for Wire-Cloth and Sieves for Testing 230-mesh silicon carbide grains have particle sizes of about the same size
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(63 µm). In the United States, abrasive papers are classified in accordance
Purposes
with ANSI B74.10. Abrasive powders are classified by ASTM mesh size.
2.2 Other Document:
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ANSI B74.10 Grading of Abrasive Microgrits
5. Reagents
3. Significance and Use 5.1 Acetone, cp.
5.2 Nitrogen Gas—Commercial cylinders of nitrogen gas
3.1 In most of their uses, insulating oils are continually in
are satisfactory for this purpose.
contact with metals that are subject to corrosion. The presence
6. Preparation of Apparatus
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This test method is under the jurisdiction of ASTM Committee D27 on
6.1 Chemically clean flasks with solvents to remove oil,
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
then wash the flasks with phosphate-type cleaning powder or
mittee D27.06 on Chemical Tests.
liquid. Rinse with tap water, then with distilled water, and dry
Current edition approved March 10, 2003. Published May 2003. Originally
approved in 1953. Last previous edition approved in 1996 as D 1275 – 96a. in an oven.
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Annual Book of ASTM Standards, Vol 05.01. 1
6.2 Cut a strip of copper 6 by 25 mm ( ⁄4 by 1 in.) (Note 2)
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Annual Book of ASTM Standards, Vol 14.02.
and remove blemishes from surfaces with the 240-grit silicon
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Available from American National Standards Institute, 25 W. 43rd St., 4th
carbidepaper.Stripsmaybestoredinsulfur-freeacetoneatthis
Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 1275 – 03
point for future use. Do the final polishing of the strip by to remove all of the oil and let air dry. Do not use pressurized
removingitfromtheacetone,holdingitinthefingersprotected air to dry copper strip.
with ashless filter paper, and rubbing with 230-mesh silicon
NOTE 4—The corrosive effects of unstable sulfur compounds present in
carbide grains picked up from a glass plate wit
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