FprEN 1428

Bitumens and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method

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.

Bitumen und bitumenhaltige Bindemittel - Bestimmung des Wassergehaltes von Bitumenemulsionen - Azeotropisches Destillationsverfahren

Dieses Dokument legt ein Verfahren zur Bestimmung des Wassergehaltes von Bitumenemulsionen durch azeo
trope Destillation fest.
WARNUNG- Die Anwendung dieses Dokuments kann den Einsatz gefährlicher Stoffe, Arbeitsgänge und Geräte bedingen. Dieses Dokument erhebt nicht den Anspruch, alle mit ihrer Anwendung verbun
denen Sicherheitsprobleme anzusprechen. Es liegt in der Verantwortung des Anwenders dieses
ments, geeignete Sicherheits- und Gesundheitsschutzmaßnahmen vorzusehen und vorher zu klären, ob einschränkende Vorschriften zu berücksichtigen sind.

Bitumes et liants bitumineux - Détermination de la teneur en eau dans les émulsions bitumineuses - Méthode de distillation azéotropique

Le présent document spécifie une méthode de détermination de la teneur en eau dans les émulsions bitumineuses, par distillation azéotropique.
AVERTISSEMENT - L'utilisation de ce document peut impliquer la mise en oeuvre de produits, d'opérations et d'équipements à caractère dangereux. Le présent document n'est pas censé aborder tous les problèmes de sécurité concernés par son usage. Il incombe à son utilisateur d'établir des règles d'hygiène et de sécurité appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation.

Bitumen in bitumenska veziva - Določanje vode v bitumenskih emulzijah - Metoda azeotropske destilacije

General Information

• Status: Not Published
• Publication Date: 04-Nov-2026
• ICS: 75.140 - Waxes, bituminous materials and other petroleum products
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: CEN/TC 336 - Bituminous binders
• Drafting Committee: CEN/TC 336/WG 2 - Emulsions and fluxed bitumens
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 20-May-2026
• Due Date: 14-Dec-2026
• Completion Date: 20-May-2026
• Ref Project: oSIST prEN 1428:2026 - Bitumens and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method

Relations

• Revises: EN 1428:2012 - Bitumen and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method
• Effective Date: 13-Dec-2023

Overview

FprEN 1428: Bitumens and bituminous binders - Determination of water content in bituminous emulsions - Azeotropic distillation method is a draft European Standard developed by CEN/TC 336. This standard describes the azeotropic distillation method for accurately determining the water content in bituminous emulsions. The process is vital for quality control, product formulation, and compliance in the manufacture and application of bituminous emulsions used throughout the construction and road industries.

The method specified in FprEN 1428 ensures standardized, precise, and reproducible results in determining water content, contributing to consistency and reliability in products and processes involving bituminous binders.

Safety Note: The use of hazardous materials and specialized equipment is required. Users must establish and adhere to proper safety and health practices and consider regulatory limitations before use.

Key Topics

• Water Content Determination: Specifies the azeotropic distillation method for measuring water content in bituminous emulsions.
• Standardized Testing Procedure: Outlines detailed steps, including apparatus verification, sampling, sample preparation, and calculation of results.
• Azeotropic Distillation: Utilizes a water-immiscible solvent (e.g., toluene or xylene) to separate water from the emulsion in a controlled manner.
• Precision and Reproducibility:
  • Repeatability: Results between duplicate tests by the same operator should not differ by more than 1% (absolute mass fraction).
  • Reproducibility: Results between different laboratories should not differ by more than 2% (absolute mass fraction); 3% for emulsions containing flux.
• Reporting Requirements: Specifies the minimum content for test reports, including sample identification, solvent type, detailed results, deviations from procedure, and test dates.
• Safety Considerations: Highlights potential hazards associated with solvents, heated equipment, and operational procedures.

Applications

The FprEN 1428 standard is widely used in several sectors:

• Bituminous Emulsion Production: Ensures consistent quality in manufacturing, critical for emulsions used in road construction, surface treatments, and waterproofing.
• Quality Control Laboratories: Provides a consistent protocol for water content measurement, supporting compliance with national and European regulations.
• Product Development and Research: Facilitates formulation adjustments based on precise water content measurements.
• Site Control and Compliance: Used during transport and application of bituminous materials to verify product conformity with project and regulatory requirements.
• Supplier and End-User Communication: Establishes a harmonized reference for resolving disputes over product quality or specification alignment.

Related Standards

FprEN 1428 references and aligns with several related standards, enhancing its reliability and integration with existing quality systems:

• 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)
• EN ISO 3696 - Water for analytical laboratory use - Specification and test methods

These supporting standards ensure that sampling, terminology, and solvent water content are consistent, promoting reliability and reproducibility across laboratories and applications.

---

By adhering to FprEN 1428, organizations can ensure standardized water content measurement in bituminous emulsions, supporting quality, safety, and regulatory compliance in the production and use of bituminous binders.

Standards Content (Sample)

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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

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.
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
...