EN 3747:2007
(Main)Aerospace series - O-rings, in fluorosilicone rubber (FVMQ) - Technical specification
Aerospace series - O-rings, in fluorosilicone rubber (FVMQ) - Technical specification
This standard specifies the characteristics, qualification and acceptance requirements for O-rings in fluorosilicone rubber (FVMQ) to EN 3825, EN 3826 and EN 3827, for aerospace applications.
It is applicable whenever referenced.
Luft- und Raumfahrt - O-Ringe aus Fluorsilikon-Elastomer (FVMQ) - Technische Lieferbedingungen
Diese Norm legt die Eigenschaften, Qualifikations- und Abnahmebedingungen für O-Ringe aus Fluorsilicon- Elastomer (FVMQ) nach EN 3825, EN 3826 und EN 3827 für Anwendungen in der Luft- und Raumfahrt fest.
Wann immer darauf Bezug genommen wird, ist sie anwendbar.
Aeronavtika - O-obročki, iz fluorosilikonske gume (FVMQ) - Tehnična specifikacija
General Information
Relations
Overview
EN 3747:2007 is a European standard developed by CEN specifying technical requirements for aerospace-grade O-rings made from fluorosilicone rubber (FVMQ). It defines the essential characteristics, qualification criteria, and acceptance requirements for O-rings in compliance with aerospace applications. This standard applies to O-rings manufactured according to EN 3825, EN 3826, and EN 3827, covering different hardness levels of fluorosilicone rubber.
Primarily used in the aerospace and defense industries, this standard ensures the quality, durability, and reliability of fluorosilicone rubber O-rings which are critical sealing components subject to harsh environments. EN 3747:2007 supersedes the previous EN 3747:2003 and includes updated provisions for testing, materials, and packaging requirements.
Key Topics
Material Specifications
O-rings must be made from fluorosilicone rubber compounds meeting the product standards EN 3825 (60 IRHD hardness), EN 3826 (70 IRHD hardness), and EN 3827 (80 IRHD hardness) with appropriate qualification and certification.Dimensional Tolerances
Precise gauging of dimensions ensures compatibility and fit for aerospace equipment, minimizing leakage risk and maintaining seal integrity.Mechanical Properties
Requirements cover hardness (measured by IRHD scale), density tolerance, and compression set with strict limits such as a maximum 25% compression set after 24 hours at 150°C.Resistance Testing
O-rings undergo accelerated aging tests at elevated temperatures (200°C for 70 hours) and exposure to specified liquids to verify resistance to heat and chemical degradation.Surface Condition and Packaging
Surface imperfections are controlled per EN 3376, and packaging must conform to ISO 1749 with additional guidelines to prevent damage, including individual sealing in water vapor, ozone, oil, and grease-proof materials.Quality Assurance and Inspection
Detailed procedures for batch testing, acceptance sampling, and qualification inspections ensure consistent quality, including sampling plans based on batch size and type of test (destructive or non-destructive).
Applications
EN 3747:2007 O-rings are widely used in aerospace applications where reliability is paramount, including:
Aircraft Hydraulic Systems
Sealing components exposed to fuel, oils, and hydraulic fluids that require resistance to chemical attack and temperature extremes.Engine Components
High-performance seals for engines and auxiliary power units where thermal stability and mechanical resilience are critical.Fuel Systems
O-rings in fuel delivery and storage systems needing compatibility with aviation fuels and resistance to aging.Spacecraft and Defense Equipment
Critical seals in aerospace and defense hardware demanding compliance with rigorous testing and acceptance criteria.
Related Standards
- EN 3825, EN 3826, EN 3827: Defines material specifications for fluorosilicone rubber compounds with different hardness grades used in EN 3747 O-rings.
- EN 3376: Limits on surface imperfections for elastomeric toroidal sealing rings, referenced for quality control in O-ring surfaces.
- ISO 1749: Packaging and identification requirements for elastomeric sealing rings, supplemented by EN 3747 packaging rules.
- EN 9133: Quality management system outlining qualification procedures for aerospace standard parts, governing manufacturer certification processes.
- ISO 48: Methods for measuring rubber hardness, essential for verifying compliance with hardness requirements in EN 3747.
- ISO 1817: Test methods for rubber resistance to liquids, critical to the liquid exposure tests in EN 3747.
- ASTM D1414: Rubber O-ring test methods referenced for compression set evaluation.
EN 3747:2007 provides aerospace manufacturers and suppliers with a rigorous and comprehensive framework to ensure fluorosilicone O-rings meet demanding performance, safety, and quality requirements essential for high-reliability aerospace seal applications. Compliance with this standard supports long-term operational integrity and safety in aerospace systems exposed to extreme conditions.
Frequently Asked Questions
EN 3747:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - O-rings, in fluorosilicone rubber (FVMQ) - Technical specification". This standard covers: This standard specifies the characteristics, qualification and acceptance requirements for O-rings in fluorosilicone rubber (FVMQ) to EN 3825, EN 3826 and EN 3827, for aerospace applications. It is applicable whenever referenced.
This standard specifies the characteristics, qualification and acceptance requirements for O-rings in fluorosilicone rubber (FVMQ) to EN 3825, EN 3826 and EN 3827, for aerospace applications. It is applicable whenever referenced.
EN 3747:2007 is classified under the following ICS (International Classification for Standards) categories: 49.025.40 - Rubber and plastics. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3747:2007 has the following relationships with other standards: It is inter standard links to EN 3747:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 3747:2007 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - O-Ringe aus Fluorsilikon-Elastomer (FVMQ) - Technische LieferbedingungenAerospace series - O-rings, in fluorosilicone rubber (FVMQ) - Technical specification49.025.40Guma in polimerni materialiRubber and plasticsICS:Ta slovenski standard je istoveten z:EN 3747:2007SIST EN 3747:2009en,de01-marec-2009SIST EN 3747:2009SLOVENSKI
STANDARDSIST EN 3747:20041DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3747June 2007ICS 49.025.40Supersedes EN 3747:2003
English VersionAerospace series - O-rings, in fluorosilicone rubber (FVMQ) -Technical specificationThis European Standard was approved by CEN on 11 September 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3747:2007: ESIST EN 3747:2009
Packaging.8
1) Published as ASD Prestandard at the date of publication of
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