ISO INTERNATIONAL STANDARD 2049 Second edition 1996-07-15 Petroleum products Determination of colour (ASTM scale) Produits pétroliers -Détermination de la couleur (échelle ASTM) [SO Reference number ISO 2049:1996(E) No reproduction or networking permitted without license from IHS Not for Resale ISO2049:1996(E) Foreword IsO (the International Organization for Standardization) is a worldwide preparing International Standards is normally carried out through isO non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (lEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Internationai Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO2049 was prepared by Technical Committee ISO/TC 28,Petroleum products and lubricants. This second edition cancels and replaces the first edition (ISO 2049:1972) which has been technically revised. Annex A forms an integral part of this International Standard. ISO 1996 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 Geneve 20 · Switzerland Printed in Switzerland i Standardizatior ed by IHS U No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD @ISO ISO2049:1996(E) Petroleum products - Determination of colour (AsTM scale) equipment. This standard does not purport to address all of the safety problems 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. 1 Scope compared with a number of standard colour glasses. The matching colour standard,orthat closestto it on This International Standard specifies a method for the the darker side, is recorded as the colour value. If the visual determination of the colour of a variety of colour is darker than the darkest standard, dilution petroleum products, such as lubricating oils, heating with a specified solvent can be applied to permit fuels, diesel fuels and petroleum waxes. It is limited matching. to products that do not contain artificial dyes. 2 Normative references 4 Reagents and materials The following standards contain provisions which, 4.1 Water, complying with the requirements of throughreference inthistext,constituteprovisionsot this International Standard. At the time of publication, Grade 3 of ISO 3696 and colour no greater than the editions indicated were valid. All standards are 10 units (Hazen) in accordance with ISO 6271. subject to revision, and parties to agreements based on this International Standard are encouraged to 4.2 Kerosine, lighter in colour than a potassium investigate the possibility of applying the most recent dichromate (K2Cr207) solution formed by dissolving editionsofthestandardsindicatedbelow.Members 4,8 mg of pure anhydrous potassium dichromate, as of IEC and ISO maintain registers of currently valid specifiedinISO6353-2,in 1 litre ofwater(4.1). International Standards. ISO 3015:1992, Petroleum products Determination ofcloudpoint. 5 Apparatus ISO 3016:1994, Petroleum products Determination ofpourpoint. 5.1 Colorimeter, consisting of a light source, glass ISO 3696:1987, Water for analytical laboratory use colour standards, sample container housing with cover and viewing piece, conforming to one of the Specification and test methods. designs described in annex A. ISO 6271:—-1), Clear liquids - Estimation of colour by the platinum-cobalt scale. 5.2 Sample container, of clear colourless glass. For ISO 6353-2:1983, Reagents for chemical analysis referee tests, use the glass sample jar sho