SIST EN 924:2003

• Abstract:

  This European Standard specifies a method for determining the flashpoint of adhesives containing volatile organic compounds and makes allowance for deviations from standard atmospheric pressure. It applies to solvent-borne and solvent-free adhesives but not to water-borne adhesives containing less than10% of solvents.; NOTE Care should be taken in the interpretation of results obtained from solvent mixtures containing halogenated hydrocarbons as such mixtures can give anomalous results (see Annex A).

• Status: Published
• Publication Date: 30-Jun-2003
• ICS: 83.180 - Adhesives
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-2003
• Due Date: 01-Jul-2003
• Completion Date: 01-Jul-2003
• Ref Project: EN 924:2003 - Adhesives - Solvent-borne and solvent-free adhesives - Determination of flashpoint

• Replaces: SIST EN 924:1998 - Adhesives - Solvent-borne and solvent-free adhesives - Determination of flashpoint
• Effective Date: 01-Jul-2003
• Refers: SIST EN ISO 15605:2004 - Adhesives - Sampling (ISO 15605:2000)
• Effective Date: 28-Jan-2026
• Refers: SIST EN 1067:2006 - Adhesives - Examination and preparation of samples for testing
• Effective Date: 28-Jan-2026
• Refers: SIST EN 923:2016 - Adhesives - Terms and definitions
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4106:2014 - Aerospace series - Non-metallic materials - Structural adhesive systems - Paste adhesive - Technical specification
• Effective Date: 28-Jan-2026

SIST EN 924:2003 is the Slovenian standard identical to EN 924:2003, published by SIST. It specifies a closed cup method for determining the flashpoint of adhesives containing volatile organic compounds, with a correction for atmospheric pressure, for use with solvent-borne and solvent-free adhesives.

What does SIST EN 924:2003 specify?

SIST EN 924:2003 specifies a test method for measuring the flashpoint of adhesives and tells the user how to prepare the sample, run the test, correct the result for pressure, and report it. The scope applies to solvent-borne and solvent-free adhesives, but not to water-borne adhesives containing less than 10% solvents.

The document is organized into clauses 1 to 12, covering scope, references, terms, principle, safety, apparatus, sampling, procedure, referee testing, calculation, precision, and the test report. Annex A is referenced for interpretation of results when solvent mixtures contain halogenated hydrocarbons, because those mixtures can give anomalous results.

What are the key requirements of SIST EN 924:2003?

Test principle and sample handling

SIST EN 924:2003 uses a closed cup equilibrium method. The test portion is heated in a closed cup while ignition trials are made at intervals, and the lowest temperature at which a flash occurs is used to determine the flashpoint.

In practice, the method depends on keeping the sample and the vapour space close to temperature equilibrium. That matters because adhesives can be viscous and poor heat transfer can affect the result.

The sample must be taken and prepared in line with EN 1066 and EN 1067, and it must be kept cold enough to limit loss of volatile components. The sample container should not be stored in plastic bottles.

Apparatus and test conditions

SIST EN 924:2003 requires a closed cup with a level indicator, a suitable bath, thermometers of adequate precision, and a support that keeps the cup horizontal in the bath. The cup may be an Abel, Abel-Pensky or Pensky-Martens type, and another cup material may be used if the adhesive is affected by copper.

Ignition can be by flame or by an electrical device, but the ignition trial must be carried out within a short, controlled time. The bath heating rate must be slow enough to keep the bath and test portion within 2°C of each other.

Definitive, referee and reporting requirements

SIST EN 924:2003 starts with a preliminary test to estimate the flashpoint, then the definitive test begins about 5°C below that value. If a flash occurs, the test is repeated with a fresh portion and a lower start temperature; if no flash occurs, the temperature is raised stepwise until flashing appears.

For referee purposes, the standard gives a decision sequence based on the spread of individual results. The reported flashpoint is the mean corrected value, rounded to the nearest 0.5°C, unless the spread requires reporting individual values and a note on irregular flashing.

The observed temperature is corrected to 101.3 kPa using the pressure correction in clause 10. The test report must state the standard used, the product tested, the cup used, the mean corrected flashpoint, any deviation from the procedure, and the test date.

What terms does SIST EN 924:2003 define?

• Flashpoint (closed cup) - the minimum temperature at which vapours from a product ignite momentarily in a closed cup under standardized conditions.
• Test portion - the portion of the sample placed in the cup for the flashpoint determination.
• Referee test - an additional testing sequence used when closer agreement between results is needed.
• Repeatability (r) - the closeness expected between two results from one operator, one laboratory, and the same equipment in a short time.
• Reproducibility (R) - the closeness expected between results from different laboratories using the same standardized method.
• Volatile organic compounds - the volatile components in the adhesive that make flashpoint measurement relevant.

Who uses SIST EN 924:2003?

SIST EN 924:2003 is used by adhesive laboratories, manufacturers, and quality control teams that need to measure flashpoint for solvent-borne or solvent-free products. It is also useful for buyers, formulators, and dispute or referee testing when a documented method and a reported pressure-corrected result are needed.

What changed in SIST EN 924:2003 from the previous edition?

SIST EN 924:2003 replaces SIST EN 924:1998 and corresponds to EN 924:2003. The foreword also states that EN 924:2003 supersedes EN 924:1994.

Which standards are used with SIST EN 924:2003?

• EN 923:1998 - provides the adhesive terms and definitions used in clause 3.
• EN 1066 - gives the sampling method for taking a representative adhesive sample.
• EN 1067 - covers examination and preparation of samples for testing.

What does the SIST EN 924:2003 document contain?

The document contains a closed cup test principle, apparatus requirements, sample treatment steps, a detailed heating and ignition procedure, and a referee-testing sequence for borderline or irregular results. Figure 1 shows the closed cup arrangement in the bath, and clause 10 gives the pressure correction needed to report a value at 101.3 kPa.

It also includes precision data for repeatability and reproducibility, which helps users judge whether two results are close enough to be considered consistent. Clause 12 gives the required test-report items, so the result can be documented in a form suitable for routine control or formal comparison.

SLOVENSKI STANDARD
01-julij-2003
1DGRPHãþD
SIST EN 924:1998
/HSLOD5D]WRSLQVNDOHSLODLQOHSLODEUH]WRSLO'RORþDQMHSODPHQLãþD
Adhesives - Solvent-borne and solvent-free adhesives - Determination of flashpoint
Klebstoffe - Lösemittelhaltige und lösemittelfreie Klebstoffe - Bestimmung des
Flammpunktes
Adhésifs - Adhésifs a base de solvants et adhésifs exempts de solvant - Détermination
du point d'éclair
Ta slovenski standard je istoveten z: EN 924:2003
ICS:
83.180 Lepila Adhesives
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 924
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2003
ICS 83.180 Supersedes EN 924:1994
English version
Adhesives - Solvent-borne and solvent-free adhesives -
Determination of flashpoint
Adhésifs - Adhésifs à base de solvants et exempts de Klebstoffe - Lösemittelhaltige und lösemittelfreie Klebstoffe
solvants - Détermination du point d'éclair - Bestimmung des Flammpunktes
This European Standard was approved by CEN on 14 February 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 924:2003 E
worldwide for CEN national Members.

Contents
page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions.5
4 Principle.5
5 Safety .6
6 Apparatus .6
7 Sampling and sample treatment.8
8 Procedure .8
9 Tests for referee purposes.10
10 Calculation.10
11 Precision.11
12 Test report .11
Bibliography .12
Foreword
This document (EN 924:2003) has been prepared by Technical Committee CEN/TC 193 "Adhesives", the
secretariat of which is held by AENOR.
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 October 2003, and conflicting national standards shall be withdrawn at the latest
by October 2003.
This document supersedes EN 924:1994.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This European Standard describes one method for the determination of the flashpoint of adhesives containing
volatile organic compounds. It is generally equivalent to ISO1523, Paints, varnishes, petroleum and related
products — Determination of flashpoint — Closed cup equilibrium method. By the procedure specified in this
European Standard, differences between test apparatus of various standard designs are minimised by ensuring
that the test is carried out only when the product under test and the air/vapour mixture above it in the test vessel
are approximately in temperature equilibrium.
1 Scope
This European Standard specifies a method for determining the flashpoint of adhesives containing volatile organic
compounds and makes allowance for deviations from standard atmospheric pressure. It applies to solvent-borne
and solvent-free adhesives but not to water-borne adhesives containing less than10% of solvents.
NOTE Care should be taken in the interpretation of results obtained from solvent mixtures containing halogenated
hydrocarbons as such mixtures can give anomalous results (see Annex A).
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 923:1998, Adhesives — Terms and definitions
EN 1066, Adhesives — Sampling.
Adhesives — Examination and preparation of samples for testing.
EN 1067,
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 923:1998 and the following
apply:
3.1
flashpoint (closed cup)
minimum temperature to which a product, confined in a closed cup, is to be heated for the vapours emitted to ignite
momentarily in the presence of a flame, when operating under standardized conditions
NOTE In this European Standard, the flashpoint is corrected to an atmospheric pressure of 101,3 kPa.
4 Principle
The test portion is heated in a suitably designed closed cup by immersing it to the required level in a suitable bath.
The temperature of the bath is slowly raised at such a rate that the difference in temperature between the liquid in
the bath and the test portion in the cup never exceeds 2°C, and the heating procedure ensures that the
temperature of the test portion does not rise more quickly than about 0,5°C in 1,5 min (see Note 1).
During the heating-up period, ignition trials are carried out at intervals of not less than 1,5 min (see Note 2).
The lowest temperature at which a flash occurs is noted and from this and a duplicate determination the flashpoint
of the test product is calculated, corrected to the standard atmospheric pressure of 101, 3 kPa.
NOTE 1 To ensure that the test is carried out under approximately equilibrium conditions, a slow rate of heating is
recommended because of the low thermal conductivity of some products and also because heat transfer by convection is
hindered by the high viscosity of many products. Uniformity of temperature throughout the product under test can be assisted by
use of a stirring device, which is not operated during an ignition trial.
NOTE 2 A minimum time interval of 1,5 min is recommended to ensure that a saturation concentration of vapour in the air
space above the test portion is re-established after each ignition trial.
5 Safety
Persons using this standard shall be familiar with normal laboratory practice.
This standard does not purport to address all safety problems, if any, associated with its use.
It is the responsibility of the user to establish safety and health practices and to ensure compliance with any
European or national regulatory conditions.
6 Apparatus

 Test cup. A closed cup with an internal level indicator (see Figure 1).
Key
1 Support
2 Thermometers
Figure 1 — Closed cup with fitted stirrer (see 6.1) immersed in the bath. (The stirrer for the bath is not
shown)
Examples of suitable closed cups include Abel, Abel-Pensky and Pensky-Martens.
If the adhesive is liable to be affected by the cup materia
...