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Polytetrafluoroethylene (PTFE) is an almost chemically inert thermoplastic material which retains useful mechanical properties over a wide range of temperatures. These characteristics have caused PTFE to be used as a sealing material, particularly where lubrication problems exist.
In order to meet the demanding physical properties required, Crossley 'O' rings are manufactured from moulded stress-relieved virgin materials that are processed under strict controls to ensure they meet dimensional stability and conform to the highest standards. |
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| All SENTINEL® Filter Bags utilize the patented SENTINEL® seal. It's all plastic, polypropylene, polyester or Santoprene® construction, provides a flexible, chemically resistant seal which adapts to any filter housing. This unique design employs a pressure activated sealing lip which responds to increases in differential pressure. As the pressure increases, the seal of the ring improves, insuring by-pass free performance over all ranges of pressure, temperature and micron rating. The elevated bag handles make removal of the bag from the vessel quick and easy. When a SENTINEL® Filter Bag is installed into an Eaton Filtration Housing, the ring snaps into place, holding its position until the housing is closed. |
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| CoorsTek offers a wide variety of long-life, heat-stable, and corrosion-resistant ceramic hard-face seals using high-grade aluminas, silicon carbide, tungsten carbide, carbon graphite, and specialty polymers. |
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Alumina ceramics:
AI2O3-99% AI2O3-97%
Purigy--------------------% „99.5 „97.0
Density-------------------g/cm3 3.89 3.71
Hardness Vickers1kg-------Kg/mm2 2000 1900
Modulus of Elasticity-----GPa 330 280
Fracture toughness--------Mpa*m1/2 3.8 3.5
Flexural Strength (MOR)---MPa 330 320
Compressive Srrength------MPa 2600 2300
Thermal Expansion (CTE)---10-6/K 8.2 8.0
Thermal conductivity------W/(m.K) 30.0 26.0 |
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Extruded and jointed "O" rings are our preferred method of production, but moulded versions are available if specifically requested.
Both silicone & fluorosilicone with all varieties of fillers are available for the manufacture of "O" rings.
The advantages of vulcanised "O" rings are:
- Cost Effective
- No tooling costs
- Reduced lead times
- Better surface finish (zero flash)
- Allows hollow sections to be used for lower compression force
-Custom lengths easily produced (up to approx 2m developed length) |
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Customized production of o-rings
You can't find what you're looking for in our vast range? No problem - COG customised production will be pleased to help with your special requirements. Even the most "unconventional" seals can be individually manufactured at our own production facilities (in-house compounding, in-house development, in-house toolmaking). In the materials and qualities of your choice - within a matter of days. Singly and in large or small batches. It's an offer that few other manufacturers can match. And another thing that you'll be pleased to hear: customised production at COG costs less than you think. Let's talk about your aims!
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General Information
HTMS Metal- O-Ring seals are made from high precision metal tube. Contrary to flat gaskets, HTMS Metal-O- Rings require extreme low bolting load. Because they feature a certain resiliency or spring back, HTMS Metal O Rings will compensate minor flange rotation and maintain positive sealing load to the sealing surface.
For sealing thin gas or low viscosity fluids, HTMS recommend to soft plate the bare metal seal with such materials as silver, gold or tin. Also PTFE as a coating is available.
HTMS Metal O Rings are made for internal or external pressure. For high pressure application HTMS advises vented or system pressure assisted Metal O Rings.
For extreme low leakage requirements at elevated temperatures HTMS also produces spring energized metal O Rings. This “OS” design is basically a metal O Ring with an inserted high tensile spring.
Metal O Ring availability
- From 6 mm to +3000 mm diameter
- Cross section from 0, 89 mm to 12, 7 mm
- In house plating, Silver, Gold, Tin and others
- Spring energized versions for extreme tightness
- Available in shaped forms
- For internal or external pressure
Metal O-Rings capability
- Temperatures from cryogenic (- 270°C) up to high temperatures (+ 900°C)
- Ultra hard vacuum and pressures op to +300Mpa
- Handles hydrogen gas up to non- Newtonian fluids
- Moderate pressure capability
- Lowest leak rate
- Radiation resistant
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| O-Rings Seals in standard and metric dimensions and different compounds always available ex stock. |
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O-rings, produced according to DIN 3771: All current materials: ACM, AU, CSM, CR, EPDM, EPM, FEPM, FFKM, FPM, FYMQ, HNBR, IIR, NBR, NR, PTFE, PVMQ, VMQ.
Inside diameter from 0.74 to 1400 mm; Strength of thread from 0.6 to 30mm
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Our seven million stocked 'O' rings include inch sizes and metric sizes to a range of international, national and industry standards.
These are held in a variety of general and high performance elastomers to suit the vast majority of industrial and specialist oil and gas sector applications. |
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| Broad chemical resistance, except against liquid alkaline metals and fluorine gas under pressure. Good sliding qualities, low wear and tear. Temperature range from -200 °C to +260°C. PTFE has hardness of approximately 95 °Shore and installing these O-rings in split grooves is recommended or alternatively the use slit or sheathed types due to the low elasticity. |
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Packing made of expanded graphite yarns reinforced with Inconel wires and coated with a graphite-based mix. LATTYgraf 6940 contains a sacrificial anode to protect the valve stem and the stuffing box.
This special structure withstands high pressures without graphite extrusion.
High-performance valves.
Thermal oils and all high-temperature fluids, power stations, refineries, boiler plants, etc.
Limitation: precautions in oxydising environment.
Approval: BAM (oxygen), amended fire test API 607. |
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Chesterton’s 1210 Ceramic Stationary Seal Face may be used with 891 and 440 rotary seals to form a dual mechanical seal. The 891 is the inboard seal exposed to the process fluid. The 440 is the secondary (outboard) seal that seals barrier fluid to the atmosphere.
Can supply variable barrier pressure through the unit.
Shields the environment from the pumped fluid.
Provides a clean fluid to the inboard seal faces.
Can operate as a pre-installed "stand-by" seal in the event of primary seal maintenance. |
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Rings & Bushing
Manufacturing a customized seal ring in link with specifications, and machining it to the required degree of flatness are not major engineering challenges. The problem is that the ring must remain flat to function regardless of application and environment. Wear resistance, toughness, corrosion resistance, and resistance to thermal shocks are the key material properties required for long-lasting, all-perfect pump function.
The unique combination of all these material characteristics has made cemented carbide the most widely used material in pump seals and bearing in the sewage, mining and process sectors. Moreover, there is further potential to tailor cemented carbide for a vast range of environment applications.
Cemented carbide can be made harder than the hardest steel, but yet remain tougher then ceramics. |
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General Information
HTMS Metal- C-Ring seals are made from high temperature alloy strip. The strip is cut to the required length and tig welded. The C-shape is then formed in a tool or is roll formed for bigger sizes. HTMS Metal C Rings are a logical development over our popular Metal O Ring. Metal C Rings have a better spring back then same size Metal O Rings. The seating load or the required bolting force is lower than for similar sized Metal O Rings. HTMS Metal C Rings will compensate greater flange rotation and maintain positive sealing load, better than Metal O Rings.
For sealing thin gas or low viscosity fluids, HTMS recommend to soft plate the bare metal seal with such materials as silver, gold or tin. Also PTFE as a coating is available.
For extreme low leakage requirements at elevated temperatures HTMS also produces spring energized metal C Rings. This “CS” design is basically a metal C Ring with an inserted high tensile spring.
Metal C Ring availability
- From 6 mm to +3000 mm diameter
- Cross section from 0, 89 mm to 12, 7 mm
- In house plating, Silver, Gold, Tin and others
- Spring energized versions for extreme tightness
- Available in shaped forms
- For internal or external pressure
Metal C Rings capability
- Temperatures from cryogenic (- 270°C) up to high temperatures (+ 900°C)
- Ultra hard vacuum and pressures op to +300Mpa
- High pressure capability
- Lowest leak rate
- Radiation resistant
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| ... products without technical information |
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