SIST EN ISO 4264:2018
(Main)Petroleum products - Calculation of cetane index of middle-distillate fuels by the four variable equation (ISO 4264:2018)
Petroleum products - Calculation of cetane index of middle-distillate fuels by the four variable equation (ISO 4264:2018)
This document specifies a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. The calculated value is termed the "cetane index by four-variable equation". Throughout the remaining text of this document, the term "cetane index" implies cetane index by four-variable equation.
This document is applicable to fuels containing non-petroleum derivatives from tar sand and oil shale. It is not applicable to pure hydrocarbons, nor to distillate fuels derived from coal. Cetane index calculations do not take into account the effects from additives used to enhance the Cetane number.
NOTE 1 This document was originally developed using a matrix of fuels, some of which contain non-petroleum derivatives from tar sands and oil shale.
NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to be used with due regard for its limitations.
NOTE 3 The cetane index is used to estimate the cetane number of diesel fuel when a test engine is not available to determine this property directly, or when insufficient sample is available for an engine rating.
The most suitable range of fuel properties for application of this document is as follows:
Fuel property
Range
Cetane number
32,5 to 56,5
Density at 15 °C, kg/m3
805,0 to 895,0
10 % (V/V) distillation recovery temperature, °C
171 to 259
50 % (V/V) distillation recovery temperature, °C
212 to 308
90 % (V/V) distillation recovery temperature, °C
251 to 363
Within the range of cetane number (32,5 to 56,5), the expected error of the prediction via the cetane index equation will be less than ±2 cetane numbers for 65 % of the distillate fuels examined. Errors can be greater for fuels whose properties fall outside this range of application.
As a consequence of sample-specific biases observed, the expected error can be greater even when the fuel's properties fall inside the recommended range of application. Therefore, users can assess the required degree of prediction agreement to determine the fitness-for-use of the prediction.
NOTE 4 Sample specific biases were observed for distillate fuels containing FAME (fatty acid methyl ester).
Mineralölerzeugnisse - Berechnung des Cetanindex von Mitteldestillat-Kraftstoffen aus der 4-Parameter-Gleichung (ISO 4264:2018)
Dieses Dokument legt ein Verfahren zur Berechnung des Cetanindex von Mitteldestillat-Kraftstoffen auf Mineralölbasis fest. Der berechnete Wert wird im Folgenden als "Cetanindex aus der 4 Parameter-Gleichung" bezeichnet. Im weiteren Text dieses Dokuments wird die Benennung "Cetanindex" als Abkürzung für "Cetanindex aus der 4 Parameter Gleichung" verwendet.
Dieses Dokument ist anwendbar auf Kraft und Brennstoffe, die nicht-erdölstämmige Folgeprodukte der Verarbeitung von Teersanden und Ölschiefer enthalten. Es ist weder anwendbar auf reine Kohlenwasserstoffe noch auf Destillatkraftstoffe auf Kohlebasis. Die Berechnung des Cetanindex berücksichtigt nicht die Wirkung von Additiven, die zur Erhöhung der Cetanzahl verwendet werden.
ANMERKUNG 1 Dieses Dokument wurde ursprünglich unter Verwendung einer Matrix von Kraft und Brennstoffen entwickelt, von denen einige nicht-erdölstämmige Komponenten enthielten, die aus Teersand und Ölschiefer gewonnen wurden.
ANMERKUNG 2 Der Cetanindex ist kein alternativer Weg, die Cetanzahl auszudrücken; er ist ein zusätzliches Hilfs-mittel, welches unter gebührender Berücksichtigung seiner Einschränkungen zu benutzen ist.
ANMERKUNG 3 Der Cetanindex wird zur Abschätzung der Cetanzahl von Dieselkraftstoff verwendet, wenn ein Prüfmotor zur direkten Bestimmung dieser Eigenschaft nicht verfügbar ist, oder wenn für eine motorische Prüfung keine aus¬reichende Probenmenge vorhanden ist.
Der für die Anwendung dieses Dokuments am besten geeignete Bereich der Kraftstoffeigenschaften wird wie folgt angegeben:
Kraft und Brennstoffeigenschaft Bereich
Cetanzahl 32,5 bis 56,5
Dichte bei 15 °C, kg/m3 805,0 bis 895,0
10 % (V/V)-Destillatrückgewinnungstemperatur, °C 171 bis 259
50 % (V/V)-Destillatrückgewinnungstemperatur, °C 212 bis 308
90 % (V/V)-Destillatrückgewinnungstemperatur, °C 251 bis 363
Innerhalb des Cetanzahlbereichs (32,5 bis 56,5) beträgt der erwartete Fehler für die Vorhersage durch die Cetanindex Gleichung bei 65 % der untersuchten Kraftstoffdestillate weniger als ±2 Cetanzahlen. Bei Kraftstoffen, deren Eigenschaften außerhalb dieses Bereichs liegen, können die Fehler größer sein.
Als eine Folge beobachteter probenspezifischer systematischer Abweichungen kann der erwartete Fehler möglicherweise auch dann größer sein, wenn die Eigenschaften des Kraftstoffs innerhalb des empfohlenen Bereichs liegen. Anwender können deshalb den für die Gebrauchstauglichkeit erforderlichen Übereinstimmungsgrad der Vorhersage abschätzen.
ANMERKUNG 4 Probenspezifische systematische Abweichungen wurden bei Fettsäuremethylester (FAME) haltigen Destillatkraftstoffen beobachtet.
Produits petroliers - Calcul de l'indice de cétane des distillats moyens par equation à quatre variables (ISO 4264:2018)
Le présent document spécifie une méthode de calcul de l'indice de cétane des distillats moyens de différentes provenances pétrolières. La valeur obtenue est appelée indice de cétane calculé par équation à quatre variables. Tout au long du texte du présent document, le terme «indice de cétane» est employé pour désigner l'indice de cétane calculé par équation à quatre variables.
Le présent document est applicable aux combustibles contenant des produits non pétroliers dérivés des schistes bitumineux ou des sables bitumineux. Il n'est pas applicable aux hydrocarbures purs, ni aux distillats issus de la houille. Le calcul de l'indice de cétane ne prend pas en compte les effets des additifs destinés à améliorer l'indice de cétane.
NOTE 1 À l'origine, le présent document a été développé en utilisant une matrice de combustibles, dont certains contenaient des produits non pétroliers dérivés des schistes bitumineux et des sables bitumineux.
NOTE 2 L'indice de cétane calculé n'est pas une notion de remplacement de l'indice de cétane mesuré. Il s'agit d'un outil supplémentaire à utiliser en tenant compte de ses limites.
NOTE 3 L'indice de cétane calculé est utilisé pour estimer l'indice de cétane mesuré d'un gazole moteur quand il n'est pas possible d'effectuer un essai moteur, soit qu'il n'y ait pas de moteur disponible, soit que la quantité de l'échantillon disponible soit insuffisante.
Le domaine des propriétés d'un combustible le plus approprié pour l'application du présent document est le suivant:
Propriété du combustible
Intervalle
Indice de cétane mesuré
32,5 à 56,5
Masse volumique à 15 °C, kg/m3
805,0 à 895,0
Point de distillation 10 % (V/V) condensé, °C
171 à 259
Point de distillation 50 % (V/V) condensé, °C
212 à 308
Point de distillation 90 % (V/V) condensé, °C
251 à 363
À l'intérieur de l'intervalle (32,5 à 56,5) pour la valeur de l'indice de cétane mesuré, l'erreur prévisible sur l'indice de cétane calculé par l'équation est inférieure à ±2 unités d'indice de cétane pour 65 % des distillats examinés. Il peut se produire des erreurs plus grandes pour des produits qui ne sont pas compris dans ce domaine d'application.
En conséquence, même lorsque les propriétés du carburant sont comprises dans l'intervalle recommandé de cétane mesuré, des biais supérieurs à ±2 unités d'indice de cétane peuvent être observés. Les utilisateurs peuvent donc évaluer la précision nécessaire pour leur prévision.
NOTE 4 Des biais spécifiques aux échantillons ont été observés pour les combustibles distillés contenant des esters méthyliques d'acides gras (EMAG).
Naftni proizvodi - Izračun cetanskega indeksa srednjih destilatov po enačbi s štirimi spremenljivkami (ISO 4264:2018)
Ta dokument določa postopek za izračun cetanskega indeksa srednjih destilatov iz virov, pridobljenih iz nafte. Izračunana vrednost se imenuje »cetanski indeks po enačbi s štirimi spremenljivkami«. V nadaljevanju besedila tega dokumenta izraz »cetanski indeks« pomeni cetanski indeks po enačbi s štirimi spremenljivkami.
Ta dokument se uporablja za goriva z nenaftnimi derivati iz katranskega peska in naftnega
skrilavca. Ne uporablja se za čiste ogljikovodike ali za destilatna goriva, pridobljena iz premoga. Izračuni cetanskega indeksa ne upoštevajo učinkov aditivov za zvišanje cetanskega števila.
OPOMBA 1 Ta dokument je bil prvotno razvit z uporabo matrice goriv, od katerih nekatera vsebujejo nenaftne derivate iz katranskega peska in naftnega skrilavca.
OPOMBA 2 Cetanski indeks ni alternativni način izražanja cetanskega števila; to je dodatno orodje,
pri katerem je treba upoštevati njegove omejitve.
OPOMBA 3 Cetanski indeks se uporablja za oceno cetanskega števila dizelskega goriva za neposredno določanje te lastnosti, če ni na voljo preskusnega motorja ali v primeru nezadostnega vzorca za oceno motorja.
Najustreznejši razpon lastnosti goriva za uporabo tega dokumenta je:
Razpon lastnosti goriva
Cetansko število 32,5–56,5
Gostota pri 15 °C, kg/m3 805,0–895,0
10–odstotna (V/V) destilacija, obnovitvena temperatura, 171–259 °C
50–odstotna (V/V) destilacija, obnovitvena temperatura, 212–308 °C
90–odstotna (V/V) destilacija, obnovitvena temperatura, 251–363 °C
V razponu cetanskega števila (32,5–56,5) je pričakovana napaka napovedi z enačbo cetanskega indeksa pri 65 % pregledanih destilacijskih goriv manj kot ± 2 cetanski števili. Napake so lahko večje pri gorivih z lastnostmi izven tega območja uporabe.
Kot posledica opažene pristranskosti pri posameznih vzorcih so pričakovane napake lahko večje tudi v primeru, da so lastnosti goriva v priporočenem obsegu uporabe. Zato lahko uporabniki ocenijo zahtevano stopnjo dogovora o napovedi, da določijo primernost za uporabo napovedi.
OPOMBA 4 Pristranskost pri posameznih vzorcih je bila opažena pri destilatnih gorivih, ki vsebujejo FAME (metilne estre maščobnih kislin).
General Information
- Status
- Published
- Public Enquiry End Date
- 02-Oct-2017
- Publication Date
- 11-Sep-2018
- Technical Committee
- NAD - Petroleum products, lubricants and related products
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 29-Aug-2018
- Due Date
- 03-Nov-2018
- Completion Date
- 12-Sep-2018
Relations
- Effective Date
- 01-Oct-2018
- Effective Date
- 01-Oct-2018
Overview
EN ISO 4264:2018 specifies a standardized procedure to calculate the cetane index of middle-distillate fuels using the four-variable equation. The cetane index is a calculated estimate of diesel ignition quality derived from measured physical properties - not a substitute for engine-determined cetane number but a supplementary tool when an engine test is unavailable or sample size is limited. The standard applies to petroleum-derived middle-distillate fuels, including those containing non-petroleum derivatives from tar sand and oil shale, but excludes pure hydrocarbons and coal-derived distillates. Additives that modify cetane number are not accounted for in the calculation.
Key topics and requirements
- Input parameters: density at 15 °C and distillation recovery temperatures at 10%, 50%, and 90% (V/V).
- Calculation method: the official four-variable equation (uses the four measured variables) is the normative method; nomographs are provided in an informative annex as an alternative for practical use.
- Measurement standards: density and distillation temperatures must be determined using referenced methods (e.g., ISO 3675 or ISO 12185 for density; ISO 3405 for distillation). ISO 3924 may be used as an alternative to ISO 3405, but data must be converted to equivalent ISO 3405 values before calculation.
- Reporting: report the cetane index to the nearest 0.1 as “cetane index by four-variable equation.”
- Applicability ranges & precision: most suitable fuel property ranges are provided (cetane number 32.5–56.5; density 805–895 kg/m3; specific 10/50/90% distillation temperature ranges). Within the specified cetane number range, the expected prediction error is less than ±2 cetane numbers for about 65% of examined fuels. The standard warns of sample-specific bias (notably for fuels containing FAME).
Practical applications and users
- Quality control and fuel testing laboratories using EN ISO 4264:2018 to estimate diesel ignition quality when engine-testing is impractical.
- Refinery and blending operations monitoring fuel batch properties and compliance with diesel specifications.
- Regulatory bodies and procurement teams requiring a standardized, reproducible cetane index for specification verification or reporting.
- R&D and technical teams assessing middle-distillate fuel characteristics where rapid, non-engine-based estimates are needed.
Related standards
EN ISO 4264:2018 references and works with:
- ISO 3405 - determination of distillation characteristics
- ISO 3924 - GC boiling range distribution (alternative)
- ISO 3675 / ISO 12185 - density determination methods
- ISO 91 - temperature/pressure volume corrections
EN ISO 4264:2018 is a practical, standardized method for estimating cetane index that integrates with established fuel test methods and helps stakeholders compare and control middle-distillate fuel quality.
Frequently Asked Questions
SIST EN ISO 4264:2018 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Petroleum products - Calculation of cetane index of middle-distillate fuels by the four variable equation (ISO 4264:2018)". This standard covers: This document specifies a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. The calculated value is termed the "cetane index by four-variable equation". Throughout the remaining text of this document, the term "cetane index" implies cetane index by four-variable equation. This document is applicable to fuels containing non-petroleum derivatives from tar sand and oil shale. It is not applicable to pure hydrocarbons, nor to distillate fuels derived from coal. Cetane index calculations do not take into account the effects from additives used to enhance the Cetane number. NOTE 1 This document was originally developed using a matrix of fuels, some of which contain non-petroleum derivatives from tar sands and oil shale. NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to be used with due regard for its limitations. NOTE 3 The cetane index is used to estimate the cetane number of diesel fuel when a test engine is not available to determine this property directly, or when insufficient sample is available for an engine rating. The most suitable range of fuel properties for application of this document is as follows: Fuel property Range Cetane number 32,5 to 56,5 Density at 15 °C, kg/m3 805,0 to 895,0 10 % (V/V) distillation recovery temperature, °C 171 to 259 50 % (V/V) distillation recovery temperature, °C 212 to 308 90 % (V/V) distillation recovery temperature, °C 251 to 363 Within the range of cetane number (32,5 to 56,5), the expected error of the prediction via the cetane index equation will be less than ±2 cetane numbers for 65 % of the distillate fuels examined. Errors can be greater for fuels whose properties fall outside this range of application. As a consequence of sample-specific biases observed, the expected error can be greater even when the fuel's properties fall inside the recommended range of application. Therefore, users can assess the required degree of prediction agreement to determine the fitness-for-use of the prediction. NOTE 4 Sample specific biases were observed for distillate fuels containing FAME (fatty acid methyl ester).
This document specifies a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. The calculated value is termed the "cetane index by four-variable equation". Throughout the remaining text of this document, the term "cetane index" implies cetane index by four-variable equation. This document is applicable to fuels containing non-petroleum derivatives from tar sand and oil shale. It is not applicable to pure hydrocarbons, nor to distillate fuels derived from coal. Cetane index calculations do not take into account the effects from additives used to enhance the Cetane number. NOTE 1 This document was originally developed using a matrix of fuels, some of which contain non-petroleum derivatives from tar sands and oil shale. NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to be used with due regard for its limitations. NOTE 3 The cetane index is used to estimate the cetane number of diesel fuel when a test engine is not available to determine this property directly, or when insufficient sample is available for an engine rating. The most suitable range of fuel properties for application of this document is as follows: Fuel property Range Cetane number 32,5 to 56,5 Density at 15 °C, kg/m3 805,0 to 895,0 10 % (V/V) distillation recovery temperature, °C 171 to 259 50 % (V/V) distillation recovery temperature, °C 212 to 308 90 % (V/V) distillation recovery temperature, °C 251 to 363 Within the range of cetane number (32,5 to 56,5), the expected error of the prediction via the cetane index equation will be less than ±2 cetane numbers for 65 % of the distillate fuels examined. Errors can be greater for fuels whose properties fall outside this range of application. As a consequence of sample-specific biases observed, the expected error can be greater even when the fuel's properties fall inside the recommended range of application. Therefore, users can assess the required degree of prediction agreement to determine the fitness-for-use of the prediction. NOTE 4 Sample specific biases were observed for distillate fuels containing FAME (fatty acid methyl ester).
SIST EN ISO 4264:2018 is classified under the following ICS (International Classification for Standards) categories: 75.160.20 - Liquid fuels. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 4264:2018 has the following relationships with other standards: It is inter standard links to SIST EN ISO 4264:2007, SIST EN ISO 4264:2007/A1:2013. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 4264:2018 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2018
1DGRPHãþD
SIST EN ISO 4264:2007
SIST EN ISO 4264:2007/A1:2013
1DIWQLSURL]YRGL,]UDþXQFHWDQVNHJDLQGHNVDVUHGQMLKGHVWLODWRYSRHQDþELV
ãWLULPLVSUHPHQOMLYNDPL ,62
Petroleum products - Calculation of cetane index of middle-distillate fuels by the four
variable equation (ISO 4264:2018)
Mineralölerzeugnisse - Berechnung des Cetanindex von Mitteldestillat-Kraftstoffen aus
der 4-Parameter-Gleichung (ISO 4264:2018)
Produits petroliers - Calcul de l'indice de cétane des distillats moyens par equation à
quatre variables (ISO 4264:2018)
Ta slovenski standard je istoveten z: EN ISO 4264:2018
ICS:
75.160.20 7HNRþDJRULYD Liquid fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 4264
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2018
EUROPÄISCHE NORM
ICS 75.160.20 Supersedes EN ISO 4264:2007
English Version
Petroleum products - Calculation of cetane index of
middle-distillate fuels by the four variable equation (ISO
4264:2018)
Produits petroliers - Calcul de l'indice de cétane des Mineralölerzeugnisse - Berechnung des Cetanindex
distillats moyens par equation à quatre variables (ISO von Mitteldestillat-Kraftstoffen aus der 4-Parameter-
4264:2018) Gleichung (ISO 4264:2018)
This European Standard was approved by CEN on 23 May 2018.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4264:2018 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 4264:2018) has been prepared by Technical Committee ISO/TC 28 "Petroleum
and related products, fuels and lubricants from natural or synthetic sources" in collaboration with
Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related products of
petroleum, synthetic and biological origin” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2019, and conflicting national standards shall
be withdrawn at the latest by January 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4264:2007.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4264:2018 has been approved by CEN as EN ISO 4264:2018 without any modification.
INTERNATIONAL ISO
STANDARD 4264
Third edition
2018-06
Petroleum products — Calculation of
cetane index of middle-distillate fuels
by the four variable equation
Produits pétroliers — Calcul de l'indice de cétane des distillats
moyens par équation à quatre variables
Reference number
ISO 4264:2018(E)
©
ISO 2018
ISO 4264:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this 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 copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
ISO 4264:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Principle . 2
5 Procedure. 2
6 Calculation . 3
7 Expression of results . 3
8 Precision . 3
9 Test report . 3
Annex A (informative) Calculated cetane index by means of nomographs . 5
ISO 4264:2018(E)
Foreword
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum products and lubrica
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...