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    METAL SEALS

     

    Resilient Metal Seals – assured leak prevention for extreme conditions.

     

       
    metal seals o-ring

    Our Resilient Metal Seals are designed to avoid leakage problems even at extreme temperatures and pressures, and in harsh chemical environments. Their gas-tight and fluid-tight sealing has been developed primarily – but not exclusively – for automotive power systems in medium- and heavy-duty vehicles. These include internal combustion engine (ICE) units fueled by diesel, other liquid fuels and hydrogen (H2ICE), as well as hydrogen fuel cell electric vehicle (FCEV) applications.

     

     

        
     

      Extreme resilience.

     
    Leakage is virtually zero (as little as 10-10 cc/sec He), however demanding the situation. The durability of our Resilient Metal Seals is exceptional. In addition to a long and trouble-free service life, they offer an unlimited shelf life. (Unlike elastomer seals, which deteriorate with age even before installation.) Saint-Gobain Resilient Metal Seals will withstand:
                                                                                                                                                                                                                                                                                                        
    Space saving high pressure
    extreme temperatures high pressures ultra-high vacuums harsh chemicals
           

    up to +900°C
    down to -270°C

    up to 75,000 psi
    (5,000 bar)

    down to  10-12 mbar

    including hydrogen, grease and residues from diesel exhaust

           

       

    Enhanced system performance.

    By minimizing leakage, and hence increasing power and efficiency, they improve the performance of both existing and developing fueled systems. This enhancement is welcomed by OEMs, Tier 1 suppliers and tuning kit providers. It allows systems to be pushed to new levels, without fear of the increasingly demanding conditions this creates.

     

    A perfect and permanent fit.

    Essentially, a metal seal has the properties of a spring, holding a continuous line of contact with the cavity to prevent or restrict leakage. Under a sufficient seal contact load, it deforms to conform with the shape of the contacting surface. 
    Importantly, metal seals are less flexible than polymer alternatives. In most cases, the metal seal undergoes plastic as well as elastic deformation – ultimately becoming permanently reshaped to fit tightly against the sealed assembly. This is the reason why metal seals are not reusable. Once a sealed joint has been disconnected, its seal must be replaced with a new one.

     

    Static and dynamic possibilities.

    In most applications, Resilient Metal Seals are static – except perhaps for a little movement due to vibration. When we speak of a dynamic metal seal application, we are usually talking about slow and limited motion. Typically, this might mean:

    • Thermal expansion – up to 0.250” (6.35 mm) of linear motion
    • Movement due to mechanical clearances – 0.008-0.050” (0.203-1.27 mm)
    • Movement due to pressure in the system – 0.008-0.050” (0.203-1.27 mm)
    • Slow or limited rotation – quarter turns, fewer than 100x within system’s life
    • Limited mating/demating cycles – fewer than 200x within system’s life

    Metal seals with relatively large amounts of movement – 0.100” (2.54 mm) or more – tend to be regarded as ‘flow restrictors’ rather than true seals. However, we will be happy to work with you to create much more dynamic metal seals, with extremely low leakage, if your application requires them.
     

     

    Key factors in leak prevention addressed.

    Resilient Metal Seals can be broadly divided into two types: face seals and radial (axial) seals. Face seals generate a seal contact load by being compressed. Radial seals generate their load through interference between the contacting surfaces of the bore and shaft. In each case, the seal contact load results in deformations of the seal or its plating which enable it to fill any imperfections in the mating hardware.

    The metal seal’s effectiveness in preventing leakage depends on factors including:

    •    Size of the contact load
    •    Quality of the seal’s surface finish
    •    Quality of the cavity’s surface finish
    •    Degree of conformity of the seal contact line to the cavity surface
    •    Choice of plating material

     

    Customised and tested for complete confidence.

    At Saint-Gobain, we can vary the factors above, and other parameters, to achieve the best result for you. We offer a range of Resilient Metal Seal types, shapes and structures to suit the nature of the application and the conditions faced. As with any Saint-Gobain product, our design engineers will co-operate with you to develop a tailored solution meeting your precise needs. They draw upon deep technological experience in fields such as aviation, space and energy, as well as automotive engineering. 
    The seal’s size, shape and other characteristics will be optimized for your use, and it will be produced with tight tolerances. Crucially, our simulation programs and testing facilities will ensure full confidence in its behavior under real-life conditions.

     

    Ready for the harshest applications.

    Our Resilient Metal Seals were initially developed for internal combustion engine vehicle (ICE) and hydrogen mobility applications, but their properties offer other great opportunities both within and beyond the automotive sector. Examples include:
    •    Fueling noses (diesel and gas)
    •    CO2 compressors
    •    Robotics
    •    Hydrogen tanks
    •    Valves

    The key automotive applications of our Resilient Metal Seals, relating to medium-duty and heavy-duty vehicles, are:

    exhaust manifold truck heavy duty turbo charger truck EGR valve truck bellows replacement truck engine
    exhaust manifold turbocharger and exhaust manifold interfaces  butterfly and wastegate valves incl. EGR* valves  bellows replacement
    Challenge: hot exhaust gas temperatures; thermal movement Challenge: non-uniform joint separation Challenge:  extreme temperatures; thermal movement Challenge: high cost of welded bellows; thermal movement
    Solution: external dynamic resilient metal lip seals
     

    Solution: metal turbo seal (internal pressure type) with or without retainer plate

    Solution: axial V-seal
     

    Solution: assembly including two external dynamic resilient metal lip seals and a machined tube

    *EGR: exhaust gas recirculation

     

    Flexible production options.

    The base materials for our Resilient Metal Seals are usually high-temperature metals like INCONEL 718 steel and stainless steel. Optional plating with gold, silver or other coatings can be applied to adjust seal properties as required for specific applications. Heat treatment increases the seals’ strength and durability.
    Most of our metal seals are produced by die-forming (stamping) or roll-forming processes. We can supply any quantity, however large or small. Depending on the volume needed, and the cost considerations, we manufacture them on manual or fully automated lines. 

     

    Metal Material used for seals
     

    Tailored to your needs

    Like all our products, our Metal Seals will be custom-designed, configured and manufactured according to the requirements of your individual application and order.
    Our engineers will work closely with you at all stages to understand and meet those needs precisely. Discuss your challenges with us, engineer to engineer.
    CONTACT US

     

     

     

     

    Need further information? Please download the document below or contact our experts directly.

     ​​​

     

        

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    Thermal Management Systems Symposium 2023

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    October 03rd, 2023 - October 04th, 2023
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    Germany

    October 09th, 2023 - October 11th, 2023
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    October 11th, 2023 - October 11th, 2023

    About Saint-Gobain

    Saint-Gobain designs, manufactures and distributes materials and solutions for the construction, mobility, healthcare and other industrial application markets; they can be found everywhere in our living places and daily life, providing wellbeing, performance and safety. 

    Saint-Gobain Seals' polymer and metal seals solutions and components are used globally in critical systems that "move" us every day and into the future: automotive, commercial vehicles, life science, industrial and any other markets, where the safety of the human being is in the focus of the application.

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