EN 2795:2018

Aerospace series - Fluorocarbon rubber (FKM) - Low compressions set - Hardness 50 IRHD

This document specifies the properties of fluorocarbon rubber (FKM) ), low compression set, hardness 50 IRHD, for aerospace applications.

Luft- und Raumfahrt - Fluorcarbon-Elastomer (FKM) - Niedriger Druckverformungsrest - Härte 50 IRHD

Dieses Dokument legt die Eigenschaften von Fluorcarbon-Elastomer (FKM) mit niedrigem Druckverformungsrest, Härte 50 IRHD, für Anwendungen in der Luft- und Raumfahrt fest.

Série aérospatiale - Élastomère fluoré (FKM) - Faible déformation rémanente après compression - Dureté 50 DIDC

Le présent document spécifie les propriétés de l’élastomère fluoré (FKM), dureté 50 DIDC, à faible déformation rémanente après compression, pour applications aérospatiales.

Aeronavtika - Fluoroogljikove gume (FKM) - Nizka stopnja kompresije - Trdota 50 IRHD

Ta dokument določa lastnosti flluoroogljikove gume (FKM)1), nizki kompresijski sklop, trdota 50 IRHD, za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 06-Mar-2018
• Withdrawal Date: 29-Sep-2018
• ICS: 49.025.40 - Rubber and plastics
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 07-Mar-2018
• Completion Date: 07-Mar-2018
• Ref Project: SIST EN 2795:2018 - Aerospace series - Fluorocarbon rubber (FKM) - Low compressions set - Hardness 50 IRHD

Overview

EN 2795:2018 - Aerospace series - Fluorocarbon rubber (FKM), low compression set, hardness 50 IRHD - defines the material properties and test requirements for a specific FKM rubber grade intended for aerospace use. The standard specifies mechanical, thermal and chemical resistance characteristics obtained from standard test specimens and identifies which tests are required for qualification and batch acceptance. Typical applications require resistance to air, hydrocarbon and synthetic oils and fuels at elevated temperatures while maintaining a low compression set.

Key topics and requirements

• Material identity: Fluorocarbon rubber (FKM) with nominal hardness 50 IRHD (symbol per ISO 1629).
• Performance properties: Includes hardness, density, tensile strength (minimum 8 MPa), elongation at break (minimum 200 %) and compression set.
• Compression set: Specified low compression set; for example, a maximum of 25 % after 70 h at 200 °C is required (qualification and batch acceptance rules apply).
• Temperature range: Continuous service −20 °C to 225 °C; intermittent service up to 250 °C.
• Environmental and chemical exposures: Tests for resistance after exposure to air and to specified liquids (per ISO 1817), with permissible variations in volume, mass, tensile strength, elongation and hardness.
• Additional tests: Ozone resistance, corrosion and adhesion to metals (e.g., 168 h at 200 °C in dry atmosphere), and other aging/compatibility checks as listed in the standard.
• Testing and acceptance: All qualification tests must be performed; a subset marked in the standard is required for routine batch acceptance. Density for each batch must not deviate more than 0,03 Mg/m3 from the qualified value.
• Designation and technical specification: Material designation follows the format shown in EN 2795; technical specification references are provided in EN 3207.

Applications and who uses it

• Primary uses: Seals, O-rings, gaskets and other elastomeric components in aircraft fuel, hydraulic and engine systems where resistance to hydrocarbons, oils and elevated temperatures is critical.
• Typical users: Aerospace OEMs, suppliers of elastomeric seals, materials and compound formulators, quality and qualification engineers, maintenance/repair organizations (MROs), and procurement teams specifying component materials for aviation systems.

Related standards

• EN 3207 - Aerospace series - Rubber compounds - Technical specification (referenced for technical spec).
• ISO 1629 - Nomenclature for rubber and latices.
• ISO 1817 - Determination of the effect of liquids on vulcanized rubber (used for fluid exposure tests).

EN 2795:2018 is essential when specifying an FKM compound for high-temperature, hydrocarbon-exposed aerospace applications where low compression set and consistent mechanical performance are required.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Fluoroogljikove gume (FKM) - Nizka stopnja kompresije - Trdota 50 IRHDLuft- und Raumfahrt - Fluorocarbon-Elastomer (FKM) - Niedriger Druckverformungsrest - Härte 50 IRDHSérie aérospatiale - Élastomère fluoré (FKM) - Faible déformation rémanente après compression - Dureté 50 DIDCAerospace series - Fluorocarbon rubber (FKM) - Low compressions set - Hardness 50 IRHD49.025.40Guma in polimerni materialiRubber and plasticsICS:Ta slovenski standard je istoveten z:EN 2795:2018SIST EN 2795:2018en,fr,de01-maj-2018SIST EN 2795:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2795
March
t r s z ICS
v {ä r t wä v r English Version
compressions set æ Hardness
w r IRHD déformation rémanente après compression æ Dureté
w r DIDC Niedriger Druckverformungsrest æ Härte
w r IRHD This European Standard was approved by CEN on
s u November
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
t y { wã t r s z ESIST EN 2795:2018

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