ISO 14935:2020

INTERNATIONAL ISO
STANDARD 14935
Second edition
2020-04
Petroleum and related products —
Determination of wick flame
persistence of fire-resistant fluids
Pétrole et produits connexes — Détermination de la persistance
d'une flamme sur une mèche trempée dans un fluide difficilement
inflammable
Reference number
ISO 14935:2020(E)
©
ISO 2020

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ISO 14935:2020(E)

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ISO 14935:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 2
6 Apparatus . 2
7 Samples and sampling . 5
8 Preparation of apparatus . 5
9 Procedure. 5
10 Calculation . 6
11 Expression of results . 6
12 Precision . 6
13 Test report . 7
Bibliography . 8
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ISO 14935:2020(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).
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expressions related to conformity assessment, as well as information about ISO's adherence to the
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 19, Gaseous and liquid fuels, lubricants and related
products of petroleum, synthetic and biological origin, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 14935:1998), which has been technically
revised. The main changes compared to the previous edition are as follows:
— material data of the reservoir have been changed;
— some designations have been changed;
— drawings have been revised;
— tolerances in ignition and dropping times and nozzle dimensions have been tightened for better
accuracy.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 14935:2020(E)

Introduction
This document was originally developed by CEN under a mandate from the European Commission.
The test methodology laid down in this document is commonly listed in fire-resistant hydraulic fluids'
specifications, such as ISO 12922, in which it defines the minimum requirements for unused flame-
retardant and less flammable hydraulic fluids for hydrostatic and hydro-dynamic systems in general
industrial applications.
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INTERNATIONAL STANDARD ISO 14935:2020(E)
Petroleum and related products — Determination of wick
flame persistence of fire-resistant fluids
WARNING — The use of this document can involve hazardous materials, operations and
equipment. This document does not purport to address all of the safety problems associated
with its use. It is the responsibility of the user of this document to establish appropriate safety
and health practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This document specifies a method for the assessment of the persistence of a flame applied to the edge of
a wick of non-flammable material immersed in fire-resistant fluid.
This test does not determine the behaviour of a spray of fire-resistant fluid.
NOTE Such test methods are specified in ISO 15029-1 and ISO 15029-2.
This document specifies one of four basic tests for determining flammability.
This document does not apply to certain liquids such as HFAE and HFAS liquids.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3170, Petroleum liquids — Manual sampling
ISO 9162, Petroleum products — Fuels (class F) — Liquefied petroleum gases — Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
flame mean persistence
persistence for each of the five different periods of application of the igniting flame calculated as the
average of the six determinations
4 Principle
A length of non-flammable aluminosilicate plate is soaked in the fluid being tested and placed in a
reservoir of the fluid with one edge exposed.
A small flame is applied to the e
...