SIST EN 2566:2019

Aerospace series - Fluorocarbon rubber (FKM) - Hardness 70 IRHD

This document specifies the properties of fluorocarbon rubber (FKM)1), hardness 70 IRHD, for aerospace
applications.

Luft- und Raumfahrt - Fluorcarbon-Elastomer (FKM) - Härte 70 IRHD

Série aérospatiale - Élastomère fluoré (FKM) - Dureté 70 DIDC

Aeronavtika - Fluoroogljikove gume (FKM) - Trdota 70 IRHD

Ta dokument določa lastnosti fluoroogljikove gume (FKM)1), trdota 70 IRHD, za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 10-Jun-2019
• ICS: 49.025.40 - Rubber and plastics
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 07-Jun-2019
• Due Date: 12-Aug-2019
• Completion Date: 11-Jun-2019
• Ref Project: EN 2566:2019 - Aerospace series - Fluorocarbon rubber (FKM) - Hardness 70 IRHD

Overview

EN 2566:2019 is a CEN aerospace standard that specifies the required properties and testing regime for fluorocarbon rubber (FKM) compounds having a nominal hardness of 70 IRHD for aerospace applications. It defines material performance expectations, test methods to demonstrate compliance and the basis for qualification and batch acceptance of FKM used in aircraft systems where resistance to air, hydrocarbon/synthetic oils and fuels at elevated temperature is required.

Key topics and technical requirements

• Material scope: Fluorocarbon elastomer (FKM) with hardness 70 IRHD for aerospace use.
• Referenced standards: EN 3207 (rubber compound technical specification), ISO 1629 (nomenclature) and ISO 1817 (effect of liquids).
• Service temperature:
  • Continuous: −20 °C to 225 °C
  • Intermittent: −20 °C to 250 °C
• Mechanical properties (examples from standard):
  • Hardness: 70 IRHD (batch acceptance required)
  • Tensile strength: ≥ 11 MPa (minimum, batch acceptance)
  • Elongation at break: ≥ 175% (minimum, batch acceptance)
  • Low-temperature behavior: TR10 ≤ −12 °C
  • Compression set: specified limits after exposure at 200 °C (e.g., 24 h and 70 h values)
• Aging and media resistance:
  • Defined tests after exposure to designated fluids (per ISO 1817) and elevated temperatures
  • Permitted maximum reductions in performance (e.g., tensile strength and elongation) after exposure are specified for qualification
• Production control:
  • All qualification tests required for initial approval; a subset (marked in the standard) required for routine batch acceptance
  • Density variation per batch must remain within the stated tolerance (as referenced)

Applications and who uses it

EN 2566 is intended for:

• Aerospace OEMs and suppliers specifying elastomeric materials for seals, O‑rings, gaskets, diaphragms and other dynamic/static sealing elements
• Materials engineers, procurement and quality assurance departments validating FKM batches for aircraft fuel, oil and hydraulic systems
• Design engineers requiring documented resistance to high temperature, fuels and oils for component selection

Practical applications include engine and fuel-system seals, high-temperature hydraulic seals, and other environments where hydrocarbon and synthetic oil resistance at elevated temperatures is critical.

Related standards

• EN 3207 - Rubber compounds - Technical specification (used for technical specification linkage)
• ISO 1629 - Rubber and latices - Nomenclature
• ISO 1817 - Rubber, vulcanized - Determination of the effect of liquids

Keywords: EN 2566, FKM, fluorocarbon rubber, 70 IRHD, aerospace seals, high‑temperature elastomer, oil and fuel resistance, ISO 1817, EN 3207.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2019
Aeronavtika - Fluoroogljikove gume (FKM) - Trdota 70 IRHD
Aerospace series - Fluorocarbon rubber (FKM) - Hardness 70 IRHD
Luft- und Raumfahrt - Fluorcarbon-Elastomer (FKM) - Härte 70 IRHD
Série aérospatiale - Élastomère fluoré (FKM) - Dureté 70 DIDC
Ta slovenski standard je istoveten z: EN 2566:2019
ICS:
49.025.40 Guma in polimerni materiali Rubber and plastics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 2566
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 49.025.40
English Version
Aerospace series - Fluorocarbon rubber (FKM) - Hardness
70 IRHD
Série aérospatiale - Élastomère fluoré (FKM) - Dureté Luft- und Raumfahrt - Fluorcarbon-Elastomer (FKM) -
70 DIDC Härte 70 IRHD
This European Standard was approved by CEN on 13 November 2017.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2566:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Application of the material . 5
5 Properties . 5
6 Designation . 7
7 Technical specification . 7

European foreword
This document (EN 2566:2019) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2019, and conflicting national standards shall
...