ISO INTERNATIONAL STANDARD 4264 Third edition 2018-06 Petroleum products -Calculation of cetane index of middle-distillate fuels by the four variable equation Produits petroliers -Calcul del'indice de cetane des distillats moyens par équationa quatre variables Referencenumber ISO 4264:2018(E) oISO2018 Notfor ISO 4264:2018(E) COPYRIGHT PROTECTED DOCUMENT O IS02018 All rights reserved.Unless otherwisespecified,or required in the context of its implementation,no part ofthis publication may be reproduced or utilized otherwise in any form or by any means,electronic or mechanical,including photocopying or posting on the internet or an intranet,without prior written permission.Permission can be requested from either Iso at the address below or ISO's member body in the country of the requester ISO copyrightoffice CP 401-Ch.de Blandonnet 8 CH-1214 Vemier,Geneva Phone:+41227490111 Fax:+4122749..0947 Emall:[email protected] Website:wwwiso.org Published in Switzerland CorgmiiOgrtateta stanaon O ISO 2018-All rights reserved Piovided by THS Markt unde icense wih ANSI No reproducion or networkrg peimted athout iconse trom iHs Not tor Resnle,07/1020180530:14 MOT IS0 4264:2018(E) Contents Page Foreword iv Scope 1 1 2 Normative references 2 3 Termsand definitions 4 Principle 5 Procedure 6 Calculation 3 7 Expressionofresults 8 Precision 9 Test report AnnexA (informative) Calculatedcetane indexby means of nomographs .. Coprghtrternorul oQIS0.2018-Allrightsreserved No reprodudio Not tor Aesnie,07/1020180630:14MOT