prEN 12081

SLOVENSKI STANDARD
01-oktober-2024
Železniške naprave - Ohišja ležajev kolesnih dvojic - Maziva
Railway applications - Axleboxes - Lubricating greases
Bahnanwendungen - Radsatzlager - Schmierfette
Applications ferroviaires - Boîtes d'essieux - Graisses pour lubrification
Ta slovenski standard je istoveten z: prEN 12081
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
75.100 Maziva Lubricants, industrial oils and
related products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2024
ICS Will supersede EN 12081:2017
English Version
Railway applications - Axleboxes - Lubricating greases
Applications ferroviaires - Boîtes d'essieux - Graisses Bahnanwendungen - Radsatzlager - Schmierfette
pour lubrification
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12081:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Restriction of greases . 7
5 Technical specification . 7
5.1 General. 7
5.2 Technical specification content . 7
6 Quality systems . 8
7 Conformity assessment . 8
8 Bearing speed classes . 8
9 Production . 9
9.1 General. 9
9.2 Manufacturing procedure . 9
9.3 Quality batch control . 9
9.4 Traceability . 9
10 Delivery . 10
10.1 Packaging . 10
10.2 Marking . 10
11 Storage . 10
Annex A (normative) Minimum requirements . 11
Annex B (informative) Mechanical stability of rolling bearing greases under vibration
stress . 15
Bibliography . 17

European foreword
This document (prEN 12081:2024) has been prepared by Technical Committee CEN/TC 256 “Railway
Applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12081:2017.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
Introduction
This document has been drawn up with the purpose to define the minimum requirements of greases
used for the lubrication of rolling bearings in railway axleboxes. The purpose is to ensure a certain
performance level in the interest of operating safety in international traffic. Performance implies a
certain quality level of the vehicle running gear, which every railway undertaking may require, notably
by imposing procedures in approval and quality assurance for the supply of axleboxes.
Lubricating greases intended for use in axlebox bearing application need to fulfil the requirements of
this document, complying with Table A.1.
This document has been written so that it reflects the typical performance of, e.g. an NLGI grade 2
simple lithium soap grease, based on a mineral oil with a base oil viscosity of 100 mm2/s at 40 °C such
as would be found in current use. However, this document does not restrict or limit grease evolution for
more demanding applications of today and in the future, hence several parameters are left open for
agreement.
1 Scope
This document specifies the quality requirements of greases intended for the lubrication of axlebox
rolling bearings according to EN 12080, required for reliable operation of trains on European networks.
It covers the approval procedure for a not-yet-approved grease, the management of modification for an
approved grease and the method of quality batch control of the grease. The grease requirements are
given for two speed classes.
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 12080:2017, Railway applications — Axleboxes — Rolling bearings
EN 14865-1:2009+A1:2010, Railway applications - Axlebox lubricating greases - Part 1: Method to test
the ability to lubricate
EN 14865-2:2017+A2:2010, Railway applications — Axlebox lubricating greases — Part 2: Method to test
the mechanical stability to cover vehicle speeds up to 200 km/h
EN ISO 3104:1996, Petroleum products — Transparent and opaque liquids — Determination of kinematic
viscosity and calculation of dynamic viscosity (ISO 3104:1994)
ISO 1817:2015, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 2137:2007, Petroleum products and lubricants — Determination of cone penetration of lubricating
greases and petrolatum
ISO 2176:1995, Petroleum products — Lubricating grease — Determination of dropping point
ISO 11007:2021, Petroleum products and lubricants — Determination of rust-prevention characteristics
of lubricating greases
ISO 13737:2004, Petroleum products and lubricants — Determination of low-temperature cone
penetration of lubricating greases
ASTM D1831:2021, Standard Test Method for Roll Stability of Lubricating Grease
DIN 51777:2020, Petroleum products — Determination of water content using titration according to Karl
Fischer
DIN 51811:2017, Testing of lubricants — Testing of corrosiveness to copper of greases — Copper strip
tarnish test
DIN 51820:1989, Testing of lubricants; analysis of greases by infrared spectrometry; taking and
evaluating an infrared spectrum
NF F 19-502:1989, Railway rolling stock — Test method of greases for axle-boxes to rolling bearings —
Vibrations and shocks enduring test on machine « ROPECS »
NF F 19-503:1989, Railway rolling stock — Test method of greases for axle-boxes to rolling bearings —
Dynamic test for stability to oxydation of grease
NF F 19-504:1993, Railway rolling stock — Test method of greases for axle-boxes to rolling bearings —
Grease suitability test on the « R2F » machine
NF T 60-190:2011, Petroleum products — rolling stability of lubricating greases
ISO 22285:2018, Petroleum products and lubricants — Determination of oil separation from grease —
Pressure filtration method
ISO 22286:2018, Petroleum products and lubricants - Determination of the dropping point of grease with
an automatic apparatus
NF T 60-637:2017, Water content in grease by Karl Fischer after purging after final survey
ASTM D7303:2012, Standard Test Method for Determination of Metals in Lubricating Greases by
Inductively Coupled Plasma Atomic Emission Spectrometry
DIN 51460-1:2007, Testing of petroleum products — Method for sample preparation — Part 1:
Microwave incineration
DIN 51829:2013, Petroleum products — Determination of additive and wear elements in greases —
Analysis by wavelength dispersive X-ray fluorescence spectrometry
EN ISO 11885, Water quality - Determination of selected elements by inductively coupled plasma optical
emission spectrometry (ICP-OES) (ISO 11885)
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:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
Certificate of Analysis (CoA)
document issued by the supplier that certifies the quality of the grease batch
3.2
Customer
railway undertaking, entity in charge of the maintenance, manufacturer or buyer of railway rolling
stock or subassemblies, bearing manufacturer or their representative
3.3
railway undertaking
organization or its representative, whatever status it has, which is responsible for registration of rolling
stock
) This document is in draft stage at the time of publication of this standard.
3.4
supplier
supplier of lubricating greases manufactured under his responsibility
3.5
network
infrastructure, on which any railway undertaking can operate rolling stock
3.6
grease
semi-solid lubricant, which consists of a thickener and additives dispersed in a lubricating oil
3.7
grease batch
entire content of a production of grease from the filling vessel
3.8
rolling bearing
bearing, operating with rolling motion between the parts supporting load and moving in relation to
each other
3.9
filling vessel
container filled with grease from which the representative sample for testing is taken and from which
commercial packs of grease are being filled
4 Restriction of greases
The bearing grease shall be free from toxic or harmful substances, see current national and
international regulations for more information.
NOTE In particular, but not limited to REACH (Registration, Evaluation, Authorization and Restriction of
Chemicals).
5 Technical specification
5.1 General
The following information shall be fully documented. The requirements specified t
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