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The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

‘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. 
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