NEW

Protecting your seals

Dust gets everywhere.  We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory!  However, dust that seeps and builds up within engineering equipment can be disastrous.  Causing damage...

Importance of durometer testing

Durometer or shore durometer is a way for industry professionals to measure how hard such things as plastic, rubber, and non-metallic materials genuinely are.  Its focus is to measure on a Shore A or Shore D scale, looking at how robust material is when examining its...

Metal Detectable O Rings

Metal detectable o rings became a necessary must when it was identified that some chemicals, exposure to extreme temperatures, and continuous vibrations could cause failings in standard o rings.  Failings that not only mean a breaking of the seal, but there is also an...

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

O Ring Replacement

Replacing an O Ring in pressure washer wands is probably one of the most common replacements you'll find when working with seals.  Unfortunately, O Rings don't last forever, and over time they do deteriorate, and you will require an O Ring replacement.  It's important...

Reasons behind seal failure and a look into seal replacement

Unfortunately, there are occasions where O-rings, in particular, fail.  The failure of these seals is not simply due to one factor, but various factors that can occur across a range of applications – hence why locating the exact cause of such problems is just that, a...

Gaskets and seals for Aerospace

Gaskets and seals used for aerospace applications and equipment must be of premium quality and to a substantially high standard.  They are used across a range of applications such as radars, antennas, lighting, access panels, electrical conductivity, pressure sealing,...

Finding the best sealing materials for Food Grade Applications

You will find rubber seals across various industries, providing an important element and operating as a vital fixing across a wide range of different applications and equipment.  However, these FDA gaskets must follow strict, set guidelines, in terms of their material...

The Evolution of Gasket Solutions

When we talk about gaskets and the history of a gasket, we must start at the very beginning.  What is a gasket?  Ultimately, a gasket is a manufactured seal that is used to fill the gap/space between two or more surfaces.  Gaskets are typically manufactured by cutting...

‘O’ RINGS 

‘O’ Rings, also known as a toric joint, are a mechanical gasket in the shape of a torus, a loop of elastomer with a disc shaped cross section, designed to be seated in a groove. These ‘O’ rings are an exceptionally versatile sealing device and may be used in static or dynamic applications and are produced from a wide selection of elastomeric materials.

‘O’ Rings are one of the most common seals used in machine design as they are relatively inexpensive to manufacture, reliable and have simple mounting requirements., being capable of sealing tens of megapascals of pressure. ‘O’ Ring selection is based upon chemical compatibility, application temperature, sealing pressure, lubrication requirements, quality, quantity and cost.

O Rings Seal

SSP stock an extensive range of material compounds and sizes and are also able to offer product with full certification traceability, batch and cure date coding, with individual bagging and labelling meeting both aerospace and critical application requirements.  

SSP are certified to ISO 9001:2015 Incorporating AS9120 Aerospace Standard 

In addition to the many different material types and BS and Metric size ‘O’ Rings available, we also supply FEP Encapsulated ‘O’ Rings, Completion Plug ‘O’ Rings and ‘O’ Ring Kits and Cord. 

Typical General and High Performance materials readily available include; 

Aflas  Available in hardness range of 70, 80 and 90 IRHD these compounds are suitable for sour gas duties or where amines and high temperature water or steam are used. They have resistance to lubricants and some fuels and a typical temperature range of -10⁰C to +200⁰C. The main requirement includes oil field and chemical industry applications. 

Butyl – Very low gas permeability makes butyl popular for vacuum and high pressure gas applications. It must not be used with mineral oils 

Chloroprene (Neoprene)  This general purpose elastomer is largely unaffected by sunlight and atmospheric ageing. It gives satisfactory service in many media such as lubricating oils and greases , dilute acids and alkalis and refrigerants including ammonia, carbon dioxide and freons. Temperature range is typically from -40⁰C to +100⁰C 

EPDM – Has excellent resistance to weathering, ozone, hot and cold water and steam. Also have resistance to aliphatic phosphate-ester hydraulic fluids, acids, alkalis, salt solutions, alcohols, glycols and silicone oils. Peroxide cured EPDM materials have better resistance to temperature and chemicals and obtain better compression set values than sulphur cured. Some specific grades do have WRAS approval for use in potable water applications. Not to be used with mineral oil products. 

FKM (Viton®) – General Fluoroelastomer grades operate efficiently under severe chemical conditions and at high temperatures where many other seal materials cannot survive. Dependent upon choice of grade they can be well suited to arduous applications involving; 

    • Temperature Capabilities ranging from –61⁰C to +260⁰C  
    • Petroleum fuels and Mineral-based hydraulic fluids 
    • Aliphatic, aromatic and chlorinated hydrocarbons 
    • Silicone oils and greases 
    • Vegetable and animal oils and fats 
    • Non-polar solvents 
    • Ozone, weathering and aging 

    FKM is not resistant to; 

    • Glycol based brake fluids 
    • Polar solvents 
    • Superheated steam 
    • Amines, alkalis and low molecular organic acids 

    We also stock high performance grades of FKM for specific duties, including; 

    • FR68/90 – This low compression set elastomer offers excellent resistance to rapid gas decompression (RGD), plus excellent resistance to sour gas, amines and steam/hot water 
    • FR58/90 – This terpolymer based grade resists RGD and has good all round elastomeric properties 
    • FR25/90 – Has excellent resistance to sour gas together with improved low temperature characteristics. It is compounded for RGD resistant duties down to -41⁰C 
    • FR64/70 & 80 – Dipolymer based grades that offer enhanced performance in steam, hot water and mineral acids 

    Fluorosilicone  Grades are available for applications involving hydrocarbon oils, petroleum fuels and mineral based hydraulic fluids. Primarily used for static seals in aerospace fuel systems. Use may be limited by high gas permeability, low tensile strength and poor resistance to abrasion and tear. Fluorosilicones have substantially better resistance to mineral oils and fuels than normal silicones and have a typical temperature range between -60⁰C and +200⁰C 

    HNBR (Hydrogenated acrylonitrile-butadiene rubber) – is obtained by selective hydrogenation of the double bond of the butadiene molecules of the NBR rubber. With higher levels of saturation HNBR exhibits distinctly better resistance to high temperatures along with enhanced physical strength and chemical resistance properties 

    Typical grades and hardnesses of HNBR ‘O’ rings have good resistance to mineral oil-based oils and greases, vegetable oils and fats and aliphatic hydrocarbons and have a typical Temperature range of -30⁰C to +150⁰C. 

    We also stock two high performance compound grades of HNBR ‘O’ rings, these being; 

    • Elast-O-Lion 101 and 985 – These materials have excellent oil/fuel resistance of traditional NBR elastomers with a similar ACN content. They also have superior mechanical properties and can sustain higher service temperatures i.e 180⁰C in oil. In addition they also display superior resistance to aggressive fluids such as sour crude oil, lubricating oil additives and amine corrosion inhibitors. These two grades are extremely well proven in oilfield applications where mechanical strength, plus resistance to rapid gas decompression (RGD) (ED-Explosive decompression) and chemical attack is required. Typical temperature range can be -55⁰C to +180⁰C 

    Polyurethane  Most of the polyurethanes used for the production of seals fall into the category of thermoplastic elastomers due to stress relaxation at +50⁰C. However, they are used as ‘O’ Rings in drive transmissions where tensile strength, elongation characteristics and wear resistance properties prove invaluable for applications with high dynamic loads. However, polyurethanes have low resistance to acids, alkalis and amines, glycol based brake fluid and hot water/steam.  

    Nitrile (NBR) – is the most widely used material in production and manufacture of ‘O’ Ring Seals. NBR is a copolymer of butadiene and acrylonitrile, having very good mechanical properties, high abrasion resistance, low gas permeability and a high resistance to mineral based oils and greases. There are three main groups of Nitrile and all are differentiated by the Acrylonitrile (ACN) content which can vary generally between 18% and 50%. 

    • Medium Nitrile grades usually have an ACN content of roughly 30% and are the most commonly used of all polymers in hydraulic sealing. 
    • High Nitrile will have an ACN content nearer to 50% and will be used in applications coming into contact with aromatic fuels and mineral oils 
    • Low Nitrile will have an ACN content nearer to 18% and are primarily used for low temperature applications. 

    Silicone  these elastomers have excellent resistance to weathering, ageing, ozone, oxygen and ultraviolet radiation and offer good resistance to compression set at high temperatures along with excellent electrical resistance. Silicone is very good in food and medical applications. Silicone is limited for use due to its low tensile strength and poor resistance to tear and abrasion. Typical temperature range is -60⁰C to +200⁰C (230⁰C with special grades) 

    FFKM  These materials have excellent heat resistance, capable of being exposed to temperatures above 300⁰C. The resistance to chemicals is nearly universal and compares to that of PTFE. The great value of this group of products is having the chemical and thermal stability of PTFE combined with the elastic properties of an elastomeric compound 

    These specially designed and developed group of base compounds are specifically used where safety requirements and high maintenance input can be used to offset and justify the very high unit cost of production. Dependant on material grade selected the temperature range of this group of products is between -40⁰C to +340⁰C 

    • Kalrez® (DuPont™) – This is a particularly recognised compound group containing a range of different grades of FFKM perfluoroelastomer compounds that offer almost universal chemical resistance, with grades available for continuous duties up to 325⁰C. 
    Contact Us
    close slider

    Your Details

    Let us know how to get back to you.


    How can we help?

    Feel free to ask a question or simply leave a message.