Machined Static Seals | Custom Static Seals

Machined Static Seals

Static seals are used where both the seal and the mating hardware do not move relative to one another in the application being sealed. Static seals can either seal radially on the inside and outside diameters of the seal or axially on the side walls of the seal, with the latter commonly referred to as a face seal. O-rings are still the most common and reliable static sealing solution, but they do not always provide the necessary attributes to work in every application.

Back-up rings or anti-extrusion rings, as their name suggests, are not sealing devices but purely a device to provide ‘back-up’ protection and support to sealing elements, typically O-rings. Back-up rings are generally manufactured from extrusion resistant materials which are normally harder than the seal they are protecting. They are positioned between the sealing device and the clearance/extrusion gap in a sealing application to provide protection from extrusion under pressure and to prevent possible seal damage. In most circumstances, the pressure rating, temperature resistance and life expectancy of a sealing element can be vastly increased using the correct choice of back-up ring design, material and size. We suggest the use of a back-up ring device in all applications, where possible, to help prolong seal life expectancy.

M Seals has a wide range of static sealing and anti-extrusion / back-up ring profiles in a number of our high performance materials to work in the most arduous applications. Whether it be high-pressures, high or low temperatures, aggressive chemicals or seals that require a high degree of deflection for hardware separation, we have the solution.

Contact us with your application details and see how we can help increase both your productivity and profitability by reducing your downtime.
IMPORTANT - Please Note: The data shown below are maximum values and operating ranges and cannot be used at the same time.

For example: The maximum operating speed will depend on material type chosen, working pressure, application temperature and clearance gap values. The temperature range shown is also dependent on choice of material and media to be sealed.

Profile	Name	Operating Range	Summary
	KB20-FS	Pressure Max: 1000 bar Temperature Min: -50°C Max: 210°C Speed Max: - m/s	KB20-FS is a compact double acting face seal designed for both low and high-pressure heavy-duty static applications. The seal comprises a T-shaped sealing element with pressure activated anti-extrusion rings / back-up rings. The seal is manufactured to fit centred in the seal groove and have a high degree of gland fill. The seal also has two anti-extrusion rings to ensure the sealing element is protected from extrusion when hardware clearances are large or pressures are high. The anti-extrusion rings can be manufactured from several durable materials allowing a superior resistance to extrusion. Due to the high gland-fill of this seal, it is useful for high-pressure gas applications when produced in one of our RGD resistant elastomers. The KB20-FS can be manufactured to suit most internationally recognised O-Ring grooves in both metric and imperial sizes as well as non-standard sizes.
	KB20A-EFS	Pressure Max: 2000 bar Temperature Min: -50 °C Max: 210 °C Speed Max: - m/s	KB20A-EFS is a compact single acting external pressure face seal designed for both low and high-pressure static applications. The seal comprises a P-shaped sealing element with pressure activated anti-extrusion ring / back-up ring and is manufactured to fit tight against the inside diameter of the seal groove. The seal also has an anti-extrusion ring to ensure the sealing element is protected from extrusion when hardware clearances are large or pressures are high. The anti-extrusion rings can be manufactured from several durable materials allowing a superior resistance to extrusion. The KB20A-EFS can be manufactured to suit most internationally recognised O-Ring grooves in both metric and imperial sizes as well as non-standard sizes.
	KB20A-IFS	Pressure Max: 2000 bar Temperature Min: -50 °C Max: 210 °C Speed Max: - m/s	KB20A-IFS is a compact single acting internal pressure face seal designed for both low and high-pressure static applications. The seal comprises a P-shaped sealing element with pressure activated anti-extrusion ring / back-up ring and is manufactured to fit tight against the outside diameter of the seal groove. The seal also has an anti-extrusion ring to ensure the sealing element is protected from extrusion when hardware clearances are large or pressures are high. The anti-extrusion rings can be manufactured from several durable materials allowing a superior resistance to extrusion. The KB20A-IFS can be manufactured to suit most internationally recognised O-Ring grooves in both metric and imperial sizes as well as non-standard sizes.
	RB13	Pressure Max: 600 bar Temperature Min: -50 °C Max: 210 °C Speed Max: - m/s	The simple O-Ring is one of the oldest and most trusted static sealing methods available. M Seals can manufacture O-Rings ‘flash-free’ on the outside and inside diameter contact points helping to provide leak-free performance in radial sealing applications. We manufacture Rubber O-Rings, Polyurethane O-Rings, PTFE O-Rings and O-Rings for rapid gas decompression resistance in one of our Norsok compliant RGD / ED resistant materials.
	RB14	Pressure Max: 160 bar Temperature Min: -50 °C Max: 210 °C Speed Max: - m/s	Our RB14 is a simple square section or rectangular profile used for economical sealing of SAE flanges for both internal and external pressure (confirmation of the pressure direction is required). It provides good low-pressure sealing efficiency up to 100 Bar which can be increased through the correct choice of back-up ring. While being economical it isn’t the most robust seal for flange sealing, talk to our technical department about the best choice of seal for your application.
	SS01	Pressure Max: 400 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	SS01 profile is a static O-Ring and Back-up Ring replacement seal. It is used where the installation of 2 back-up rings and an O-Ring are problematic and time consuming. The tapered sealing points allow easier installation into the mating hardware and the dual contact points offer a degree of sealing redundancy. It has excellent resistance to pulsating pressures and does not roll or twist in the groove due its excellent stability. Commonly used on cartridge valves up to 400 Bar and higher through the correct choice of polyurethane material, it is an economical choice where O-Rings are routinely damaged at the installation stage and a more stable abrasion and tear resistant seal is required
	STB08	Pressure Max: 1000 bar Temperature Min: -200 °C Max: 260 °C Speed Max: 0 m/s	The STB08 profile is a simple endless / solid back-up ring design, but it is a precision machined component that is used to protect O-Rings and other static and dynamic seals where system pressures are greater than the capabilities of the seal alone or where high temperatures and excessive clearance / extrusion gaps are present. The STB08 is available to suit all standard O-Ring gland sizes including BS1806, BS4518, AS568, ISO3601, JISB2401, MS27595 and almost any custom size you may require. This part is available in many of our PTFE, Fluoropolymer, thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB09	Pressure Max: 1000 barTemperature Min: -200°C Max: 260°CSpeed Max: --	The STB09 profile is an endless / solid back-up ring design that is precision machined and used to protect O-Rings and other dynamic seals where system pressures are greater than the capabilities of the seal alone or where high temperatures and excessive clearance / extrusion gaps are present. The STB09 is available to suit the following standard O-Ring gland sizes including BS1806, BS4518, AS568, ISO3601 and almost any custom sizes you may require. This back-up ring is often used in the oil and gas industry where high pressure / high temperature (HPHT) applications exist. This part is available in many of our PTFE, Fluoropolymer, thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB10	Pressure Max: 700 barTemperature Min: -200 °C Max: 260 °C Speed Max: --	Profile STB10 is a pressure activated back-up ring which is designed to be used in conjunction with single acting / uni-directional piston seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications. It is normally used with small cross section seals and where radial gland space is limited. The ring is normally supplied split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB11	Pressure Max: 700 barTemperature Min: -200°C Max: 260°C Speed Max: --	STB11 profile is a pressure activated back-up ring which is designed to be used in conjunction with single acting / uni-directional rod seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications and is normally used with small cross section seals and where radial gland space is limited. The ring is normally supplied split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB12	Pressure Max: 700 bar Temperature Min: -200°C Max: 260°C Speed Max: --	STB12 profile is a pressure activated back-up ring that is similar to our STB10 design but more suited to use with parts that have larger cross sections and radial gland space. It is designed to be used in conjunction with single acting / uni-directional rod seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications. The ring is normally supplied split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. However, the ring can be supplied in an endless / solid format when split / two pieces housings are being used. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB13	Pressure Max: 700 bar Temperature Min: -200°C Max: 260°CSpeed Max: --	STB13 profile is a pressure activated back-up ring that is similar to our STB12 design but more suited to use with parts that have larger cross sections and radial gland space. The STB13 profile is designed to be used in conjunction with single acting / uni-directional piston seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications. The ring is normally supplied angle split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. However, the ring can be supplied in an endless / solid format when split / two pieces housings are being used. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB14	Pressure Max: 2000 barTemperature Min: -200 °C Max: 260 °CSpeed Max: 0 m/s	STB14 profile is a 2-part pressure activated triangular back-up ring that has increased thickness for extreme high-pressure applications. The profile is designed to be used in conjunction with single acting / uni-directional piston seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications. This part is commonly used in conjunction with many of our spring energised seals working in HPHT environments. The ring can be supplied angle split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. However, the ring can be supplied in an endless / solid format when split / two pieces housings are being used and installation of a split ring could be problematic. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	STB15	Pressure Max: 2000 barTemperature Min: -200 °C Max: 260 °CSpeed Max: 0 m/s	STB15 profile is a 2-part pressure activated triangular back-up ring that has increased thickness for extreme high-pressure applications. The profile is designed to be used in conjunction with single acting / uni-directional rod seals which require protection from excessive clearance / extrusion gaps or applications working in high pressure and high temperature applications. This part is commonly used in conjunction with many of our spring energised seals working in HPHT environments. The ring can be supplied angle split to ease installation and to ensure the ring expands when subjected to system pressure, when this pressure is applied the clearance / extrusion gap is closed by the ring and the sealing element is prevented from flowing into the gap allowing longer trouble free service. However, the ring can be supplied in an endless / solid format when split / two pieces housings are being used and installation of a split ring could be problematic. This part is available in many thermoplastic and thermoplastic elastomer materials to suit every application, talk to our technical team to discuss your requirements.
	XB56	Pressure Max: 400 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	Profile XB56 is an internal face U-Cup seal designed to work on SAE flanges. It provides a high degree of deflection over the contact faces due to the U-shaped grove in the seal face and being activated by system pressure. It is preferred in circumstances where the flange faces may part under system pressure, if this is not a concern, we recommend the use of our XB58 profile for increased leak-free operation. It is commonly supplied in one of our high-performance polyurethane materials but can be manufactured in rubber materials for increased chemical and temperature resistance where required. We can manufacture this seal to suit non-standard sizes and include anti-extrusion devices if the application pressure requires.
	XB57	Pressure Max: 400 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	Profile XB57 is an external face U-Cup seal designed to work on SAE flanges. It provides a high degree of deflection over the contact faces due to the U-shaped grove in the seal face and being activated by system pressure. It is preferred in circumstances where the flange faces may part under system pressure, if this is not a concern, we recommend the use of our XB59 profile for increased leak-free operation. It is commonly supplied in one of our high-performance polyurethane materials but can be manufactured in rubber materials for increased chemical and temperature resistance where required. We can manufacture this seal to suit non-standard sizes and include anti-extrusion devices if the application pressure requires.
	XB58	Pressure Max: 400 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	Profile XB58 is an internal face seal designed to work on SAE flanges and provides high compressive sealing efficiency over the contact faces. It is commonly supplied in one of our high-performance polyurethane materials but can be manufactured in rubber materials for increased chemical and temperature resistance where required. We can manufacture this seal to suit non-standard sizes and include anti-extrusion devices if the application pressure requires.
	XB59	Pressure Max: 400 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	Profile XB58 is an external face seal designed to work on SAE flanges and provides high compressive sealing efficiency over the contact faces. It is commonly supplied in one of our high-performance polyurethane materials but can be manufactured in rubber materials for increased chemical and temperature resistance where required. We can manufacture this seal to suit non-standard sizes and include anti-extrusion devices if the application pressure requires.
	XB74	Pressure Max: 700 bar Temperature Min: -55 °C Max: 110 °C Speed Max: - m/s	XB74 profile is a unique type of seal commonly used as a cost-effective way to pressure test API ring joints without damaging the mating 23° flanges or using a standard metallic seal. Our XB74 seal is manufactured here at M Seals and used by OEM clients all over the world with great success. This seal has also been independently pressure tested through 10 two-minute cycles at 700 Bar (10,000 PSI) in our most popular HPU-R95 polyurethane seal material without issue and has also been re-used by clients up to 30 times without failure. The unique shape of the seal provides a good interference fit within the hardware across its circumference which helps provide good static sealing and prevent it from tilting or moving while being tested. The sealing lips sit nicely under compression against the 23° flange side walls and the profiled internal groove allows the seal to be further actuated/energised by the system pressure, helping to provide a leak tight system
	XB75	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB75 profile is a plain un-flanged hygienic clamp gasket seal commonly referred to as a “plain Triclover Seal”. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions
	XB76	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB76 profile is a flanged hygienic clamp gasket seal commonly referred to as a “Flanged Triclover Seal”. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions
	XB77	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB77 profile is a hygienic clamp gasket seal. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions.
	XB78	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB78 profile is a ‘T’ shaped hygienic clamp gasket seal. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions.
	XB79	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB79 profile is a ‘D’ shaped hygienic clamp gasket seal that is commonly referred to as a “D-Ring hygienic seal”. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions.
	XB80	Pressure Max: 160 bar Temperature Min: -55 °C Max: 210 °C Speed Max: - m/s	XB80 profile is a ‘P’ shaped hygienic clamp gasket seal that is commonly referred to as a “P-Ring hygienic seal”. It is designed to seal between pipework joints according to standard DIN, ISO and British Standard sizes. It is available in a variety of food contact materials that are complaint to FDA, 3A and EC 1935/2004 standards, with some being available in metal detectable versions.