kSIST FprEN 1428:2026
(Main)Bitumens and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method
- Abstract
This document specifies a method for the determination of the water content in bituminous emulsions by means of azeotropic distillation.
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 to determine the applicability of regulatory limitations prior to use.
- Status
- Not Published
- Public Enquiry End Date
- 26-Mar-2026
- Technical Committee
- VLA - Water proofing
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 28-Jul-2026
- Due Date
- 15-Sep-2026
kSIST FprEN 1428:2026 is a draft European standard published through SIST and prepared by CEN/TC 336. It specifies an azeotropic distillation method for determining the water content in bituminous emulsions, mainly for laboratory testing, routine production control, and referee testing.
What does kSIST FprEN 1428:2026 specify?
kSIST FprEN 1428:2026 specifies one test method for measuring water in bituminous emulsions by azeotropic distillation. The document is organized as a test standard: scope, references, terms, principle, reagents, apparatus, sampling, procedure, calculation, expression of results, precision, test report, and a normative annex for apparatus verification.
The method uses heated distillation with a water-immiscible solvent-carrier liquid. In practice, that means the user measures the water separated into a graduated receiver and reports it as a mass percentage of the emulsion.
| Annex | What it covers |
|---|---|
| Annex A (normative) | Verification of the distillation apparatus by testing a known quantity of water and checking the recovered amount against permissible limits |
What are the key requirements of kSIST FprEN 1428:2026?
Principle and reagents
kSIST FprEN 1428:2026 works by distilling the water out of the emulsion with a carrier vapour from a solvent-carrier liquid that does not mix with water. The condensed solvent returns to the flask while the water collects in the receiver, so the operator can read it directly.
For routine work, the document allows xylene of recognized quality grade, while toluene is the reference solvent-carrier liquid and the choice in disputes. The solvent water content is limited, and if it is not known it is checked with EN ISO 12937. This matters because water already present in the solvent would distort the result.
Apparatus and verification
The apparatus includes a 500 ml round-bottom flask, a 25 ml graduated receiver, a water-cooled condenser, a heater, and a balance with a maximum permissible error of 0,05 g. The balance and the receiver are important because the result depends on small mass and volume differences.
Annex A requires verification of the apparatus when needed, on new apparatus before first use, and when there are doubts about reliability. In practice, this gives the laboratory a way to confirm that the assembly recovers water correctly before reporting results.
Sampling and test procedure
Sampling is linked to EN 58 and sample preparation to EN 12594. The test sample is divided into two test portions, and both are used for referee purposes.
The test is run under normal laboratory conditions at (23 ± 5) °C. The operator weighs an emulsion portion large enough to give a measurable amount of water, then distils until the water volume is constant and no water remains outside the receiver. The document also gives a table for selecting the emulsion mass according to binder content. That helps the user choose a sample size that will produce enough water for a reliable reading.
Calculation, expression, and precision
kSIST FprEN 1428:2026 calculates water content from the mass of water recovered and the mass of emulsion used, and expresses the result as a mass percentage. For practical work, the measured water volume in millilitres is taken as the same mass in grams.
The result is reported to the nearest 0,1 %. For referee purposes, the result is the arithmetic mean of two tests. Repeatability and reproducibility are stated so users can judge whether two results agree: the same operator and apparatus should stay within 1 % mass fraction in normal long-term operation, and different laboratories should stay within 2 % mass fraction, or 3 % mass fraction for an emulsion containing a flux.
What terms does kSIST FprEN 1428:2026 define?
- Water content (W) - the mass percentage of water determined by this method.
- Solvent-carrier liquid - the water-immiscible liquid used to carry the water over during azeotropic distillation.
- Test portion - one of the portions taken from the test sample for the actual measurement.
- Repeatability (r) - how close two results are when the same operator uses the same apparatus under the same conditions.
- Reproducibility (R) - how close two results are when different operators in different laboratories test the same material.
- Referee purposes - the case where two test portions are tested and the mean result is used.
Who uses kSIST FprEN 1428:2026?
Laboratory technicians use kSIST FprEN 1428:2026 to measure water in bituminous emulsions. Quality managers and production staff use it for internal control, especially where the document allows a single test for routine production control. It is also useful for referee testing, where duplicate results and an average are required, and for buyers or inspectors who need one agreed method for comparing emulsions.
What changed in kSIST FprEN 1428:2026 from the previous edition?
kSIST FprEN 1428:2026 supersedes EN 1428:2012. The draft states these significant changes:
- the definition of a suitable solvent-carrier liquid in 5.1 has been reviewed;
- the balance description in 6.3 has been completed;
- apparatus verification in 8.1 is now limited to new apparatus and cases of doubt;
- the precision of emulsion weighing in 8.2.4 has been defined.
Which standards are used with kSIST FprEN 1428:2026?
- EN 58 - provides the sampling method for bituminous binders.
- EN 12594 - gives the preparation method for test samples.
- EN 12597 - supplies the terminology used in the document.
- EN ISO 12937 - is used to determine the water content of the solvent if that content is not already known.
- EN ISO 3696:1995 - provides the recommended grade 3 water quality mentioned for use in the test.
What does the kSIST FprEN 1428:2026 document contain?
kSIST FprEN 1428:2026 contains the principle of azeotropic distillation, the list of reagents and materials, the distillation apparatus and its typical assembly, and the sampling and test procedure. It also includes a calculation formula, reporting rules, repeatability and reproducibility statements, and a test report checklist.
The document includes Table 1 for choosing the emulsion mass, Figure 1 for the apparatus layout, and Annex A for verifying the apparatus. These parts support day-to-day laboratory work, method checks, and consistent reporting.
Relations
- Effective Date
- 13-Dec-2023
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Frequently Asked Questions
kSIST FprEN 1428:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Bitumens and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method". This standard covers: This document specifies a method for the determination of the water content in bituminous emulsions by means of azeotropic distillation. 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 to determine the applicability of regulatory limitations prior to use.
This document specifies a method for the determination of the water content in bituminous emulsions by means of azeotropic distillation. 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 to determine the applicability of regulatory limitations prior to use.
kSIST FprEN 1428:2026 is classified under the following ICS (International Classification for Standards) categories: 75.140 - Waxes, bituminous materials and other petroleum products; 91.100.50 - Binders. Sealing materials. The ICS classification helps identify the subject area and facilitates finding related standards.
kSIST FprEN 1428:2026 has the following relationships with other standards: It is inter standard links to SIST EN 1428:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 1428:2026 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
oSIST prEN 1428:2026
01-marec-2026
Bitumen in bitumenska veziva - Določanje vode v bitumenskih emulzijah - Metoda
azeotropske destilacije
Bitumens and bituminous binders - Determination of water content in bituminous
emulsions - Azeotropic distillation method
Bitumen und bitumenhaltige Bindemittel - Bestimmung des Wassergehaltes von
Bitumenemulsionen - Azeotropisches Destillationsverfahren
Bitumes et liants bitumineux - Détermination de la teneur en eau dans les émulsions
bitumineuses - Méthode de distillation azéotropique
Ta slovenski standard je istoveten z: prEN 1428
ICS:
75.140 Voski, bitumni in drugi naftni Waxes, bituminous materials
proizvodi and other petroleum products
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
oSIST prEN 1428:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 1428:2026
oSIST prEN 1428:2026
DRAFT
EUROPEAN STANDARD
prEN 1428
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 91.100.50 Will supersede EN 1428:2012
English Version
Bitumens and bituminous binders - Determination of
water content in bituminous emulsions - Azeotropic
distillation method
Bitumes et liants bitumineux - Détermination de la Bitumen und bitumenhaltige Bindemittel -
teneur en eau dans les émulsions bitumineuses - Bestimmung des Wassergehaltes von
Méthode de distillation azéotropique Bitumenemulsionen - Azeotropisches
Destillationsverfahren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 336.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
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 supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1428:2026 E
worldwide for CEN national Members.
oSIST prEN 1428:2026
prEN 1428:2026 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents and materials . 5
6 Apparatus . 5
7 Sampling . 7
8 Procedure. 7
8.1 Verification of apparatus . 7
8.2 Test . 7
9 Calculation . 8
10 Expression of results . 8
11 Precision . 8
11.1 Repeatability, r . 8
11.2 Reproducibility, R . 8
12 Test report . 9
Annex A (normative) Verification of apparatus .10
Bibliography .11
oSIST prEN 1428:2026
prEN 1428:2026 (E)
European foreword
This document (prEN 1428:2026) has been prepared by Technical Committee CEN/TC 336 “Bitumens
and Bituminous binders”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1428:2012.
prEN 1428:2026 includes the following significant changes with respect to EN 1428:2012:
a) in 5.1, the definition of suitable solvent carrier liquid has been reviewed;
b) in 6.3, the description of the balance has been completed;
c) in 8.1, the requirement for the apparatus verification has been limited to any new apparatus and in
case of doubts;
d) in 8.2.4, the precision of the emulsion weighting has been defined.
oSIST prEN 1428:2026
prEN 1428:2026 (E)
1 Scope
This document specifies a method for the determination of the water content in bituminous emulsions
by means of azeotropic distillation.
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 to
determine the applicability of regulatory limitations prior to use.
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.
EN 58, Bitumen and bituminous binders — Sampling bituminous binders
EN 12594, Bitumens and bituminous binders — Preparation of test samples
EN 12597, Bitumens and bituminous binders — Terminology
EN ISO 12937, Petroleum products — Determination of water — Coulometric Karl Fischer titration method
(ISO 12937)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12597 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org
3.1
water content
W
mass percentage of water determined
...