ISO 18335:2024

Petroleum products and related products — Determination of kinematic viscosity by calculation from the measured dynamic viscosity and density – Method by constant pressure viscometer

This document specifies a procedure for determining dynamic viscosity, η, and density, ρ, for the calculation of kinematic viscosity, ν, of middle distillate fuels, fatty acid methyl ester fuels (FAME) and mixtures thereof, up to 60 % with middle distillate fuels, and lubricating oils (e.g. base oils, formulated oils), and synthetics, using a constant pressure viscometer. The range of kinematic viscosities covered in this test method is from 0,5 mm2/s to 2 000 mm2/s, with precision at 40 °C from 1,0 mm2/s to 1 286 mm2/s, and precision at 100 °C from 3,0 mm2/s to 157 mm2/s. The result obtained using the procedure described in this document depends on the rheological behaviour of the sample. This document is predominantly applicable to liquids whose shear stress and shear rate are proportional (Newtonian flow behaviour). However, if the viscosity changes significantly with the shear rate, comparison with other measuring methods is only permissible at similar shear rates.

Produits pétroliers et produits connexes — Détermination de la viscosité cinématique par calcul à partir des mesures de viscosité dynamique et de masse volumique — Méthode par viscosimètre à pression constante

Le présent document spécifie une procédure de détermination de la viscosité dynamique, η, et de la masse volumique, ρ, pour le calcul de la viscosité cinématique, ν, des distillats moyens, des esters méthyliques d'acides gras (EMAG) et de leurs mélanges, jusqu'à 60 % avec des distillats moyens, ainsi que des huiles lubrifiantes (par exemple huiles de base, huiles formulées) et les huiles synthétiques, à l'aide d'un viscosimètre à pression constante. La plage de viscosités cinématiques couverte par la présente méthode d'essai s’étend de 0,5 mm2/s à 2 000 mm2/s, avec une fidélité à 40 °C de 1,0 mm2/s à 1 286 mm2/s, et une fidélité à 100 °C de 3,0 mm2/s à 157 mm2/s. Le résultat obtenu à l'aide de la procédure décrite dans le présent document dépend du comportement rhéologique de l'échantillon. Ce document s'applique principalement aux liquides dont la contrainte de cisaillement et le taux de cisaillement sont proportionnels (comportement d'écoulement newtonien). Toutefois, si la viscosité varie considérablement en fonction du taux de cisaillement, la comparaison avec d'autres méthodes de mesure n'est possible qu'à des taux de cisaillement similaires.

General Information

• Status: Published
• Publication Date: 30-Jan-2024
• ICS: 75.080 - Petroleum products in general
• Technical Committee: ISO/TC 28 - Petroleum and related products, fuels and lubricants from natural or synthetic sources
• Drafting Committee: ISO/TC 28 - Petroleum and related products, fuels and lubricants from natural or synthetic sources
• Current Stage: 6060 - International Standard published
• Start Date: 31-Jan-2024
• Due Date: 19-Sep-2024
• Completion Date: 31-Jan-2024

Standards Content (Sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 18335
ISO/TC 28
Petroleum products and related
Secretariat: NEN
products — Determination of
Voting begins on:
2023-11-08 kinematic viscosity by calculation
from the measured dynamic viscosity
Voting terminates on:
2024-01-03
and density – Method by constant
pressure viscometer
Produits pétroliers et produits connexes — Détermination de la
viscosité cinématique par calcul à partir des mesures de viscosité
dynamique et de masse volumique — Méthode par viscosimètre à
pression constante
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 18335:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 18335:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 18335
ISO/TC 28
Petroleum products and related
Secretariat: NEN
products — Determination of
Voting begins on:
kinematic viscosity by calculation
from the measured dynamic viscosity
Voting terminates on:
and density – Method by constant
pressure viscometer
Produits pétroliers et produits connexes — Détermination de la
viscosité cinématique par calcul à partir des mesures de viscosité
dynamique et de masse volumique — Méthode par viscosimètre à
pression constante
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
ISO/CEN PARALLEL PROCESSING
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 18335:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 18335:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents and materials . 2
6 Apparatus . 3
7 Test portion preparation .
...

Style Definition
ISO/FDIS 18335:2023(E)
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Formatted: Font: 14 pt, Bold, English (United Kingdom)
ISO/TC 28
Formatted: Left: 53.85 pt, Right: 53.85 pt, Bottom:
28.35 pt, Gutter: 0 pt, Section start: New page, Header
Secretariat: NEN
distance from edge: 36 pt, Footer distance from edge:
36 pt
Date: 2023-09-13xx
Formatted: English (United Kingdom)
Formatted: zzCover large
Formatted: Cover Title_A1
Petroleum products and related products — Determination of
kinematic viscosity by calculation from the measured dynamic
viscosity and density —– Method by constant pressure viscometer
Produits pétroliers et produits connexes — Détermination de la viscosité cinématique par calcul à partir
Formatted: French (France)
des mesures de viscosité dynamique et de masse volumique — Méthode par viscosimètre à pression
Formatted: Cover Title_B, Adjust space between Latin
constante
and Asian text, Adjust space between Asian text and
numbers
Formatted: French (France)
FDIS stage

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ISO/FDIS 18335:2023(E)
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
© ISO 2023
Commented [eXtyles1]: The reference is to a withdrawn
standard which has been replaced

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
ISO 20344, Personal protective equipment — Test methods
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
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ISO copyright office
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CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (Switzerland)
EmailE-mail: [e-mail]
Formatted: French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland
ii © ISO 2023 – All rights reserved
ii © ISO 2023 – All rights reserved

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ISO/FDIS 18335:2023(E)
Formatted: Left
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Contents
Foreword . v
Introduction. vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents and materials . 3
6 Apparatus . 3
7 Test portion preparation . 4
7.1 Sampling . 4
7.2 Sample preparation . 4
8 Calibration and verification . 4
9 Apparatus preparation . 4
10 Procedure . 4
11 Calculation . 4
12 Expression of results .
...