SIST EN 2847:2014

Overview

SIST EN 2847:2014 is a European Standard that defines the properties of acrylonitrile-butadiene rubber (NBR) with a hardness of 70 IRHD, engineered for resistance to fuel and synthetic oils in aerospace applications. This standard, developed by CEN (European Committee for Standardization), ensures that materials used in demanding aerospace environments meet rigorous requirements for chemical resistance, mechanical strength, and reliability.

Acrylonitrile-butadiene rubber is widely recognized for its outstanding resistance to petroleum-based fuels and diester-based lubricants, making it a preferred choice for seals, gaskets, and components exposed to aggressive fluids. SIST EN 2847:2014 establishes consistent criteria for performance and quality, supporting safe and reliable aerospace operations across Europe.

Key Topics

• Material Properties: EN 2847 specifies properties such as hardness (70 IRHD), tensile strength, elongation at break, density, compression set, tear strength, and resistance to low temperatures and ozone.
• Chemical Resistance: The standard focuses on NBR's resistance to fuels and synthetic oils, crucial for components used in engines, hydraulic systems, and fuel systems.
• Temperature Range: The material is suitable for continuous service from -40 °C to +120 °C, and intermittent service up to +150 °C, ensuring flexibility and stability in a wide range of aerospace conditions.
• Batch Quality Control: EN 2847 outlines thorough testing and quality verification for both initial qualification and ongoing batch acceptance, helping manufacturers maintain consistent product quality.
• Designation and Traceability: The standard provides a clear method for designating NBR materials according to their specification, supporting traceability and compliance across the aerospace supply chain.

Applications

SIST EN 2847:2014 is primarily applied within the aerospace sector, where reliability and chemical compatibility are paramount:

• Seals and Gaskets: Used in aircraft systems that handle fuels and synthetic oils, including fuel tanks, pumps, and hydraulic assemblies.
• O-Rings: For sealing critical joints in engines and fluid transfer lines exposed to petroleum-based products.
• Flexible Hoses and Diaphragms: NBR's resistance to swelling and degradation makes it suitable for hoses and diaphragms in both static and dynamic aerospace applications.
• Other Fluid System Components: Any application requiring long-term exposure to fuels, lubricants, and fluctuating temperatures benefits from materials conforming to EN 2847.

This standard is also referenced for military and industrial applications where similar chemical and temperature resistance is needed, ensuring compatibility and performance consistency.

Related Standards

SIST EN 2847:2014 references and aligns with a number of important international standards to ensure comprehensive coverage of test methods and rubber compound requirements:

• EN 3207 - Aerospace series - Rubber compounds - Technical specification
• ISO 1817 - Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
• ISO 1629 - Rubber and latices - Nomenclature

These related standards support uniformity in material testing, designation, and classification, enabling manufacturers and stakeholders to meet specific aerospace and regulatory requirements with confidence.

By complying with SIST EN 2847:2014, manufacturers, suppliers, and aerospace organizations demonstrate their commitment to safety, reliability, and quality in fluid-resistant rubber components-key to maintaining the operational integrity of critical aerospace systems.