prEN 3050

SLOVENSKI STANDARD
01-september-2024
Aeronavtika - Tesnilni obročki O, izdelani iz fluoroogljikove gume (FKM) z nizko
stopnjo kompresije - Tehnična specifikacija
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set -
Technical specification
Luft- und Raumfahrt - O-Ringe aus Fluorcarbon-Elastomer (FKM) mit niedrigem
Druckverformungsrest - Technische Lieferbedingungen
Série aérospatiale - Joints toriques, en élastomère fluorocarbone (FKM), à faible
déformation rémanente après compression - Spécification technique
Ta slovenski standard je istoveten z: prEN 3050
ICS:
49.080 Letalski in vesoljski Aerospace fluid systems and
hidravlični sistemi in deli components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 49.080 Will supersede EN 3050:1998
English Version
Aerospace series - O-rings, in fluorocarbon rubber (FKM),
low compression set - Technical specification
Série aérospatiale - Joints toriques, en élastomère Luft- und Raumfahrt - O-Ringe aus Fluorcarbon-
fluorocarbone (FKM), à faible déformation rémanente Elastomer (FKM) mit niedrigem Druckverformungsrest
après compression - Spécification technique - Technische Lieferbedingungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
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 3050:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Quality assurance . 5
4.1 Qualification . 5
4.1.1 General. 5
4.1.2 Hardness Test . 5
4.2 Acceptance. 5
4.2.1 Conditions . 5
4.2.2 Responsibility . 6
4.2.3 Inspection and test report . 6
5 Requirements . 6
Annex A (normative) Packaging . 9
Bibliography . 11
European foreword
This document (prEN 3050:2024) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3050:1998.
— normative references were updated;
— Subclause 4.1.1 was updated to include further information on qualification;
— Subclause 4.1.2, Hardness Test, was added;
— Bibliography was added.
1 Scope
This document specifies the characteristics, qualification and acceptance requirements for O-rings in
low compression set fluorocarbon rubber (FKM) to EN 2798.
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 2798, Aerospace series — Fluorocarbon rubber (FKM) — Low compressions set — Hardness 80 IRHD
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 2781, Rubber, vulcanized or thermoplastic — Determination of density
ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria
ISO 27996, Aerospace fluid systems — Elastomer seals — Storage and shelf life
ASTM D1414, Standard Test Methods for Rubber O-Rings
3 Terms and definitions
For the purposes of this document, the following terms and definiti
...