Petroleum products - Corrosiveness to copper - Copper strip test (ISO 2160:1998)

Migrated from Progress Sheet (TC Comment) (2000-07-10): Revision of EN ISO 2160:1995

Mineralölerzeugnisse - Korrosionwirkung auf Kupfer - Kupferstreifenprüfung (ISO 2160:1998)

Produits pétroliers - Action corrosive sur le cuivre - Essai a la lame de cuivre (ISO 2160:1998)

La présente Norme internationale prescrit une méthode d'essai pour la détermination de l'action corrosive des produits pétroliers liquides et de certains solvants sur le cuivre, y compris les produits volatils ayant une tension de vapeur Reid inférieure ou égale à 124 kPa à 37,8 °C. Il est recommandé de tester les produits volatils ayant une tension de vapeur supérieure à 124 kPa à 37,8 °C conformément à l'ISO 6251 (voir l'avertissement ci-dessous), et de tester les huiles isolantes électriques conformément à l'ISO 5662. AVERTISSEMENT -- Certains produits, en particulier l'essence de gaz naturel, peuvent avoir une tension de vapeur significativement supérieure à ce qui est caractéristique de leur classe, même en dessous de 124 kPa à 37,8 °C. Pour cette raison, il faut s'assurer que la bombe contenant un tel produit ne soit pas placée dans le bain thermostatique à 100 °C. De tels échantillons peuvent développer à 100 °C une pression suffisante pour provoquer la rupture de la bombe, et causer des dommages et blessures.

Nafni proizvodi – Korozivnost na baker – Preskus z bakrenim trakom (ISO 2160:1998)

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SIST EN ISO 2160:1999
SIST EN ISO 2160:1998
Nafni proizvodi – Korozivnost na baker – Preskus z bakrenim trakom (ISO
Petroleum products - Corrosiveness to copper - Copper strip test (ISO 2160:1998)
Mineralölerzeugnisse - Korrosionwirkung auf Kupfer - Kupferstreifenprüfung (ISO

Produits pétroliers - Action corrosive sur le cuivre - Essai a la lame de cuivre (ISO

Ta slovenski standard je istoveten z: EN ISO 2160:1998
75.080 Naftni proizvodi na splošno Petroleum products in
SIST EN ISO 2160:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 2160:1999
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SIST EN ISO 2160:1999
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SIST EN ISO 2160:1999
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SIST EN ISO 2160:1999
Third edition
Petroleum products — Corrosiveness to
copper — Copper strip test
Produits pétroliers — Action corrosive sur le cuivre — Essai à la lame de
Reference number
ISO 2160:1998(E)
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SIST EN ISO 2160:1999
ISO 2160:1998(E)
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 2160 was prepared by Technical Committee
ISO/TC 28, Petroleum products and lubricants.
This third edition cancels and replaces the second edition (ISO 2160:1985),
of which it constitutes a technical revision.
Annexes A and B of this International Standard are for information only.
© ISO 1998

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced

or utilized in any form or by any means, electronic or mechanical, including photocopying and

microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Printed in Switzerland
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SIST EN ISO 2160:1999
Petroleum products — Corrosiveness to copper —
Copper strip test

WARNING — The use of this International Standard may involve hazardous materials, operations and

equipment. This International Standard does not purport to address all of the safety problems associated

with its use. It is the responsibility of the user of this International Standard to establish appropriate safety

and health practices and determine the applicability of regulatory limitations prior to use.

1 Scope

This International Standard specifies a method for the determination of the corrosiveness to copper of liquid

petroleum products and certain solvents. Volatile products, having a maximum vapour pressure of 124 kPa at

37,8 °C are included.

Volatile products with a vapour pressure above 124 kPa at 37,8 °C should be tested according to ISO 6251 (see

caution below). Electrical insulating oils should be tested according to ISO 5662.

CAUTION — Some products, particularly natural gasolines, may have a significantly higher vapour

pressure than is characteristic for their class, even if below 124 kPa at 37,8 °C. For this reason, extreme

caution should be exercised to ensure that the pressure vessel containing such material is not placed in a

bath at 100 °C. Such samples may develop sufficient pressure at 100 °C to rupture the pressure vessel and

cause damage and/or injury.
2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this

International Standard. At the time of publication, the editions indicated were valid. All standards are subject to

revision, and parties to agreements based on this International Standard are encouraged to investigate the

possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain

registers of currently valid International Standards.
ISO 3170:1988, Petroleum liquids — Manual sampling.
ISO 3171:1988, Petroleum liquids — Automatic pipeline sampling.
3 Principle

A polished copper strip is immersed in a specified volume of sample and heated under conditions of temperature

and time that are specific to the class of material being tested. Aviation fuels and natural gasolines are tested in a

pressure vessel, and other products are tested under atmospheric pressure (see also the note in 8.1). At the end of

the heating period, the strip is removed, washed, and the colour assessed against corrosion standards.

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SIST EN ISO 2160:1999
ISO 2160:1998(E)
4 Reagents and materials
4.1 Wash solvent

2,2,4-trimethylpentane (isooctane) of minimum 99,75 % purity is the referee solvent, but any volatile sulfur-free

hydrocarbon solvent that shows no tarnish when tested by the procedure of this International Standard for 3 h at

50 °C is suitable.
4.2 Polishing materials

4.2.1 Silicon-carbide paper or cloth, of varying degrees of fineness, including 65 μm (240 grit) grade.

4.2.2 Silicon-carbide powder, of 105 μm (150 mesh) size.
4.2.3 Absorbent cotton (cotton wool).

NOTE — Commercial grade is suitable, but pharmaceutical grade is most commonly available.

5 Apparatus

5.1 Copper strips, cut from smooth-surfaced, hard temper, cold-finished electrolytic-type copper of more than

99,9 % purity; electrical busbar stock is generally suitable.

The strips shall be 75 mm ± 5 mm in length, 12,5 mm ± 2 mm in width, and 1,5 mm to 3,0 mm in thickness.

When the strips show pitting or deep scratches that cannot be removed by the specified polishing procedure, or

when the surfaces become deformed on handling, they shall be discarded.

5.2 Pressure vessel, constructed of stainless steel and of the dimensions shown in figure 1.

The vessel shall be capable of withstanding a test pressure of 700 kPa gauge.

NOTE — Alternative designs for the vessel cap and synthetic rubber gasket may be used, provided that the internal

dimensions of the vessel are the same as those shown in figure 1.
5.3 Test tubes, of borosilicate glass, of nominal 25 mm x 150 mm.

The internal dimensions shall be checked with a metal strip of the maximum length given in 5.1 and not more than

the median dimensions for width and thickness. When 30 ml of liquid is added, a minimum of 5 mm shall be above

the top surface of the strip.
5.4 Test baths
5.4.1 General

All test baths shall have sufficient heat capacity to raise the product temperature to within – 1 °C of the test

temperature within 15 min.

5.4.2 Liquid bath for pressure vessel, capable of maintaining the product at the specified test temperature

± 1 °C.

The bath shall be constructed of non-transparent material and shall be deep enough to submerge one or more

pressure vessels (5.2) completely during the test. It shall be fitted with suitable supports to hold each pressure

vessel in a vertical position when submerged.
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SIST EN ISO 2160:1999
ISO 2160:1998(E)

5.4.3 Bath for test tubes, capable of maintaining the product at the specified test temperature ± 1 °C.

Liquid baths shall be constructed of non-transparent material, and shall be fitted with suitable supports to hold each

test tube (5.3) in a vertical position to a depth of 100 mm ± 5 mm. Solid block baths shall meet the same

temperature control and immersion conditions, and shall be checked for temperature measurement (heat transfer)

for each product class, by running tests on tubes filled with 30 ml of product plus a metal strip of the nominal

dimensions given in 5.1, plus a temperature sensor.
5.5 Temperature sensor, for indicating the test temperature.

For liquid baths, a total immersion liquid-in-glass thermometer is suitable, with graduations of 1 °C or less. It shall be

submerged in the liquid such that not more than 25 mm of the thread extends above the liquid surface.

NOTE — The ASTM 12C/IP 64C thermometer is suitable.

5.6 Polishing vice or holder, for holding copper strips firmly without marring the edges while polishing.

The strip shall be held tightly, and the surfaces of the strip that is being polished shall be supported above the

surface of the holder.
NOTE — A suitable apparatus is illustrated in figure 2.

5.7 Viewing test tubes, for protecting corroded copper strips during close inspection or during storage, of such

dimensions to allow the introduction of a copper strip (5.1) and made of glass which is free of striae or similar

NOTE — A suitable “flat” tube is illustrated in figure 3.

5.8 Forceps, spade-ended, with either stainless steel or polytetrafluoroethylene (PTFE) tips.

5.9 Corrosion standards , for the evaluation of tarnish at the end of the test.

Further details on the composition and maintenance of these standards are given for information in annex A.

5.10 Timing device, electronic or manual, accurate to 1,0 s.
6 Samples and sampling

6.1 Unless otherwise specified, samples shall be taken according to the procedures described in ISO 3170 or

ISO 3171.

6.2 Samples that are required to be tested against a “low-tarnish” strip classification shall be collected in clean,

dark-glass bottles, or other suitable containers that will not affect the corrosive properties of the liquid. Appropriate

plastic containers are suitable for some low-volatility products, but not for gasolines. Avoid the use of tinplate

containers for samples, since they may contribute to sample corrosiveness.

6.3 Fill the container as completely as possible and close it immediately after sampling. Take care to protect the

sample from direct sunlight, or even diffused daylight. Carry out the test as soon as possible after receipt, and

immediately after opening the container.

6.4 If suspended water (haze) is observed in the test sample, or when filling the test tube (5.3), dry the sample by

filtering a sufficient volume of it through a medium rapidity qualitative filter paper into a clean, dry test tube. Carry

out this operation in a darkened room or under a light-protected shield.

NOTE — Contact of the copper strip with water before, during, or after the completion of the test period will cause staining,

making it difficult to evaluate the strips.

1) Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.

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SIST EN ISO 2160:1999
ISO 2160:1998(E)
7 Preparation of test strips
7.1 Surface preparation

Remove all surface blemishes from all six sides of the copper strip (5.1) with silicon-carbide paper or cloth (4.2.1) of

such degrees of fineness as are needed to achieve the desired results efficiently. Finish with 65 μm silicon-carbide

paper or cloth, removing all marks that may have been made by other grades of paper or cloth used previously.

Immerse the copper strip in wash solvent (4.1). Withdraw immediately for fi

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