FprEN 1937

• Abstract:

  This document specifies the procedure for mixing cementitious and calcium sulfate-based floor levelling compounds with water and/or a liquid component as supplied by the manufacturer.; This document applies to cementitious, and calcium sulfate-based floor levelling compounds used for the preparation of subfloors to ensure the suitability of the substrate prior to the installation of floor coverings. By using the floor levelling compound, a homogeneous layer is built up on the load-bearing substrate, to ensure consistent absorbency, evenness and strength.

• Status: Not Published
• Publication Date: 17-Feb-2027
• ICS: 91.100.99 - Other construction materials
• Technical Committee: CEN/TC 193 - Adhesives
• Drafting Committee: CEN/TC 193/WG 4 - Building adhesives
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 26-Aug-2026
• Due Date: 16-Feb-2026
• Completion Date: 26-Aug-2026
• Ref Project: oSIST prEN 1937:2026 - Adhesives - Test method for cementitious and calciumsulfate-based floor levelling compounds - Standard mixing procedures

• Revises: EN 1937:1999 - Test method for hydraulic setting floor smoothing and/or levelling compounds - Standard mixing procedures
• Effective Date: 08-May-2024

Overview

FprEN 1937 is an important European standard developed by CEN for adhesives, specifically detailing the test method for cementitious and calciumsulfate-based floor levelling compounds. The standard establishes standardized mixing procedures to ensure consistent performance and quality in floor levelling applications. These compounds are used for the preparation of subfloors, creating a homogeneous, even, and strong substrate prior to installing various floor coverings. By providing precise guidance on mixing, FprEN 1937 helps to maintain uniform absorbency, smoothness, and mechanical strength in floor preparation processes across the construction industry.

Key Topics

• Standardized Mixing Procedures

  • Specifies how to mix cementitious and calcium sulfate-based floor levelling compounds with water or designated liquid components supplied by manufacturers.
  • Offers methods with and without waiting (maturation) times, ensuring adaptability for different compound types.

• Applicable Materials

  • Covers ready-mixed dry mortars whose binder is predominantly cement (cementitious) or calcium sulfate.
  • Includes both powder and liquid components, emphasizing proper storage and preparation.

• Test Environment Requirements

  • Stipulates test conditions, with apparatus and materials conditioned at (23 ± 2) °C and (50 ± 5) % relative humidity.
  • Emphasizes consistent laboratory practices for reproducible results.

• Apparatus and Equipment

  • Defines the type of mixers (in accordance with EN 196-1), mixing speeds, timing, and vessel characteristics for standardization.
  • Highlights periodic adjustments and maintenance of mixing equipment for reliable outcomes.

• Reporting and Traceability

  • Requires documentation of the mixing procedure, total mixing time, and batch identification for valid comparison and later reference.

Applications

The guidance provided by FprEN 1937 is pivotal for:

• Manufacturers of floor levelling compounds: Ensuring their products are tested under reproducible conditions, leading to reliable performance claims and compliance across European markets.
• Quality control laboratories: Maintaining consistency and repeatability in product testing for both internal checks and third-party certifications.
• Construction professionals and flooring installers: Gaining confidence that subfloors prepared with compounds mixed according to the standard will deliver optimal surface quality for subsequent floor coverings.
• Specifiers and architects: Relying on certified products tested under standardized methods for subfloor preparation, contributing to the durability and performance of finished flooring installations.

Related Standards

The framework of FprEN 1937 draws on and complements several related European and international standards:

• EN 196-1: Methods for testing cement, particularly strength determination and apparatus guidance.
• EN 923: Terminology specific to adhesives, providing common definitions.
• EN ISO 15605: Sampling procedures for adhesives.
• EN 1067: Examination and preparation of adhesive samples for testing.
• EN 13318:2025: Definitions related to screed material and floor screeds.
• ISO 554: Standard atmospheres for conditioning and/or testing.

FprEN 1937 supersedes EN 1937:1999, incorporating clarifications in terminology, updated procedures, and enhanced editorial clarity to reflect the latest industry needs.

By adhering to FprEN 1937, organizations ensure their processes in floor levelling compound mixing remain compliant, efficient, and compatible with modern flooring applications-ultimately safeguarding quality throughout the European construction sector.

SLOVENSKI STANDARD
01-april-2026
Lepila - Preskusna metoda za cementne in kalcijsulfatne izravnalne mase za tla -
Standardni postopki mešanja
Adhesives - Test method for cementitious and calciumsulfate-based floor levelling
compounds - Standard mixing procedures
Klebstoffe - Prüfverfahren für zement- und calciumsulfatbasierte Bodenspachtelmassen -
Standardmischverfahren
Adhésifs - Méthode d’essai pour les mortiers de nivellement à base de ciment et de
sulfate de calcium - Modes opératoires de malaxage normalisés
Ta slovenski standard je istoveten z: prEN 1937
ICS:
91.100.99 Drugi gradbeni materiali Other construction materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 1937
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2026
ICS 91.100.99 Will supersede EN 1937:1999
English Version
Adhesives - Test method for cementitious and
calciumsulfate-based floor levelling compounds - Standard
mixing procedures
Adhésifs - Méthode d'essai pour les mortiers de Klebstoffe - Prüfverfahren für zement- und
nivellement à base de ciment et de sulfate de calcium - calciumsulfatbasierte Bodenspachtelmassen -
Modes opératoires de malaxage normalisés Standardmischverfahren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 193.
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 1937:2026 E
worldwide for CEN national Members.

prEN 1937:2026 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus . 6
5 Materials . 7
6 Mixing conditions . 7
7 Mixing procedures . 7
8 Test report . 8

prEN 1937:2026 (E)
European foreword
This document (prEN 1937:2026) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,
the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1937:1999.
prEN 1937:2026 includes the following significant technical changes with respect to EN 1937:1999:
— term “hydraulic setting floor smoothing and/or levelling compounds” changed to “cementitious and
calciumsulfate-based floor levelling compounds”;
— concretisation of the scope;
— addition of the terms “underlayment”, “cementitious-based floor levelling compound” and “calcium
sulfate-based floor levelling compound”;
— mixing speed in the mixing procedure;
— editorial changes.
prEN 1937:2026 (E)
Introduction
Persons using this document are to be familiar with normal laboratory practice.
This document does not purport to address all the safety problems, if any, associated with its use.
It is the responsibility of the user to establish health and safety practices and to ensure compliance with
any European and national regulatory conditions.
prEN 1937:2026 (E)
1 Scope
This document specifies the procedure for mixing cementitious and calcium sulfate-based floor levelling
compounds with water and/or a liquid component as supplied by the manufacturer.
This document applies to cementitious, and calcium sulfate-based floor levelling compounds used for the
preparation of subfloors to ensure the suitability of the substrate prior to the installation of
...