EN 3049:1998
(Main)Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD
This standard specifies the characteristics of O-rings in fluorocarbon rubber FKM, low compression set, hardness 80 IRHD, for aerospace applications. They are intended to be used in air, mineral/synthetic oil and fuel systems. Operating conditions - Temperature: a) Continuous operation: -20°C to +225°C; b) Static applications minimum temperature of use: -50°C. Limitation: not to be used with phosphoric ester type hydraulic fluids (permanent or temporary immersion).
Luft- und Raumfahrt - O-Ringe, aus Fluorcarbon-Elastomer (FKM), mit niedrigem Druckverformungsrest - Härte 80 IRHD
Diese Norm legt die Eigenschaften von O-Ringen aus Fluorcarbon-Elastomer (FKM), mit niedrigem Druckverformungsrest, Härte 80 IRHD für die Luft- und Raumfahrt fest. Sie sind für Anwendungen in Luft, Öl- (Mineral- und synthetisch), und Kraftstoffsystemen vorgesehen. Einsatzbedingungen - Temperatur: a) Langzeitverwendung: -20°C bis +225°C; b) Mindesttemperatur bei statischen Anwendungen: -50°C. Einschränkung: nicht anzuwenden mit Hydraulikflüssigkeiten auf Phosphorsäureesterbasis (ständiges oder zeitweiliges Eintauchen).
Série aérospatiale - Joints toriques, en élastomère fluorocarbone (FKM), à faible déformation rémanente après compression - Dureté 80 DIDC
La présente norme spécifie les caractéristiques des joints toriques en élastomère fluorocarbone (FKM), à faible déformation rémanente après compression, dureté 80 DIDC, pour applications aérospatiales. Ils sont destinés à être utilisés dans les circuits d'air, d'huile minérale/synthétique et de carburants. Conditions d'utilisation - Températures: a) Service continu: -20°C à +225°C; b) Température minimale d'utilisation pour les applications statiques: -50°C. Limitation: à ne pas utiliser avec les fluides hydrauliques du type phosphate ester etc.
Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD
General Information
Relations
Overview
EN 3049:1998 (CEN) is an aerospace series specification for O-rings made from fluorocarbon rubber (FKM) with low compression set and a nominal hardness of 80 IRHD. The standard defines the intended use environment and key performance limits for these elastomer seals in aerospace fluid systems, especially where resistance to air, mineral/synthetic oils and fuels is required. It also states clear limitations for incompatible fluids.
Key topics and requirements
- Material: Fluorocarbon rubber (FKM) formulated for low compression set to improve seal life under sustained deformation.
- Hardness: Specified at 80 IRHD, suitable for high-pressure and high-temperature aerospace applications needing firmer sealing elements.
- Intended media: Approved for use with air, mineral/synthetic oils, and fuels commonly found in aircraft systems.
- Temperature limits:
- Continuous operation: -20°C to +225°C
- Static applications (minimum): -50°C
- Chemical limitation: Not to be used with phosphoric ester (phosphate ester) type hydraulic fluids, either in permanent or temporary immersion - a critical compatibility restriction for systems using fire-resistant hydraulic fluids.
- Application scope: Targeted at aerospace fluid systems and components where standardized O-ring performance and interchangeability are required.
Applications
- Selection and specification of sealing elements for air systems, fuel lines, and oil/wetted components on aircraft and spacecraft.
- Use by aerospace design engineers, systems integrators, and maintenance/repair organizations to ensure appropriate material choice and temperature compatibility.
- Procurement and quality assurance teams for supplier evaluation, part acceptance, and conformity to aerospace sealing requirements.
- Seal and elastomer manufacturers for product design, verification, and labeling when producing FKM O-rings intended for aerospace use.
Practical considerations
- Verify system fluid compatibility before selecting EN 3049 FKM O-rings; avoid phosphate-ester hydraulic fluids to prevent rapid degradation.
- Consider dynamic vs static installation: the standard gives a lower minimum temperature for static use (-50°C) than for continuous/dynamic operation.
- Use hardness and low compression set specifications to balance leak-tight performance with ease of installation and groove design.
Related standards
- EN 3049 is part of a broader set of aerospace sealing standards covering elastomer materials and O-ring specifications. For system-level design, consult complementary ISO/SAE and other EN aerospace seal standards and material data sheets for FKM compounds.
Keywords: EN 3049, FKM O-rings, aerospace O-rings, low compression set, hardness 80 IRHD, temperature range, fuel systems, phosphate ester fluids, seal compatibility.
Frequently Asked Questions
EN 3049:1998 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHD". This standard covers: This standard specifies the characteristics of O-rings in fluorocarbon rubber FKM, low compression set, hardness 80 IRHD, for aerospace applications. They are intended to be used in air, mineral/synthetic oil and fuel systems. Operating conditions - Temperature: a) Continuous operation: -20°C to +225°C; b) Static applications minimum temperature of use: -50°C. Limitation: not to be used with phosphoric ester type hydraulic fluids (permanent or temporary immersion).
This standard specifies the characteristics of O-rings in fluorocarbon rubber FKM, low compression set, hardness 80 IRHD, for aerospace applications. They are intended to be used in air, mineral/synthetic oil and fuel systems. Operating conditions - Temperature: a) Continuous operation: -20°C to +225°C; b) Static applications minimum temperature of use: -50°C. Limitation: not to be used with phosphoric ester type hydraulic fluids (permanent or temporary immersion).
EN 3049:1998 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3049:1998 has the following relationships with other standards: It is inter standard links to EN 3049:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - Hardness 80 IRHDLuft- und Raumfahrt - O-Ringe, aus Fluorcarbon-Elastomer (FKM), mit niedrigem Druckverformungsrest - Härte 80 IRHDSérie aérospatiale - Joints toriques, en élastomere fluorocarbone (FKM), a faible déformation rémanente apres compression - Dureté 80 DIDCAerospace series -
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