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Gasket & Joint Sealing

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    The Gasket & Joint Sealing Experts

    One of the advantages you’ll benefit from when working with Cotter Marketing Ltd., is the amount of exposure the company has had, initially in the many aspects of the shipping industry, and then, as time moved on, in land-based industries. For sealing solutions, you need look no further than Cotter Marketing, for the experience, the expertise, the quality of the products from top manufacturers, and the technological guidance you may need for your sealing and packing solutions. Specifically, the listings below offer you an extensive selection of gaskets and joint sealing products.

    Gaskets are produced from a number of different materials, both metallic, and non-metallic. Asbestos was used for many years because of its fire- and heat-resistant characteristics, but this has ceased because of the toxic nature of the material. Today, gaskets are produced from a number of different materials, or from a combination of materials. These include graphite, different types of rubber, silicone, cork, paper, stainless steel, polyester, and nylon. This is where the Cotter Marketing Solutions Team comes into the picture. We are ready to advise and to prepare solutions for you. Different gaskets suit different applications. View our selection below and do contact us with any questions you may have about our products or the solutions you require.


    455 Aramid Fibre Gasketing

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​General Purpose

    Gasket Sealing & Joint Sealing

    359 Graphite Gasketing

    Cost-Effective, All-Purpose


    122NN Diaphragm Sheeting

    Neoprene Rubber Construction

    860MPG Moldable Polymer Gasketing

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Creates Ultra-Thin Gaskets that Conform to Non-Uniform Surfaces


    Steel Trap Metal / Graphite Gasket

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Unique, Problem-Solving, Non-Standard Semi-Metallic Gasket

    semi-metallic gasket

    Spiral Wound Semi-Metallic Gasket

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Economical, Energized Gasket

    Joint Sealing

    185 Expanded PTFE Joint Sealant

    ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Expanded Form-In-Place PTFE Spooled Joint Sealant

    For your gasket requirements – benefits of Partnerships with Cotter Marketing

    Gaskets are designed to prevent leakage. Industrial gaskets are commonly used as follows:

    • Wherever liquids, oils, or chemicals flow, joints are positioned along pipes. Gaskets are placed between the flange faces of the joints, through which bolts are typically inserted and tightened.

    The nature of your specific operations determines the gasket sealing solution you require.

    A partnership with Cotter brings you a combination of excellent products, advice, expertise, and training:

    • Our Solutions Team is backed by our technical advisers with years of experience in seals and gaskets.
    • We enjoy distribution rights with top manufacturers in the sealing industry, including but not limited to Chesterton, Devcon, Greene Tweed, Rhino Valves, Tekhniseal, and ITW Plexus.
    • Many of our Partnerships with top gasket manufacturers are exclusive.
    • A Partnership with you, our customer, will ensure the cleanliness of your machines, and protect the safety of your operating environments. This inspires confidence in the reliability of your equipment and your operations.
    • Our on-site visits and maintenance prevent production down-time, increase the longevity of your equipment, and keep repairs and costs down to a minimum.
    • Our solutions protect your plant and machinery from erosion, abrasion, and accidents.
    • The benefits we derive from our partnerships with A++ suppliers, are paid back in full to our customers.

    A brief history of gaskets

    The first gasket was produced two centuries ago! The timing makes sense because the Industrial Revolution was in acceleration mode during this period. The materials that were used to produce gaskets went through a number of iterations. Starting off as solid seals made out of iron filings, sulphur, and water, the gasket materials quickly progressed to treated rope and tar, and were ubiquitously applied in the shipping industry of the time. The need for gaskets and seals in shipping is, of course, an obvious one—one which really defines what gaskets and seals are all about. And Cotter Marketing has been there. This is a result of the company’s early beginnings in the shipping industry, albeit not as far back as 1820!

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    Factors that influence gasket purchasing options

    Different types of gaskets are suited to different industries, and these types of gaskets come in a number of designs.

    • Gasket types: metallic, semi-metallic, and non-metallic.
    • Gasket designs: O-ring (oval or octagonal metallic), spiral wound (semi-metallic), flat (non-metallic), for example
    • Gasket materials: graphite, PTFE, Teflon, silicone, fibreglass, cork, nylon, and rubber gasket seals, for example
    • Flange size
    • Your industry and type of fluid or other medium: the gasket material must be resistant and impermeable to different mediums
    • Temperature and pressure: the gasket material must be strong enough to handle the temperatures and pressures that can be reached
    • The state and age of your equipment
    • Cost

    Semi-metallic gaskets

    Our partner, Chesterton, supplies many of our top sealing products. Below are a couple of the company’s popular semi-metallic gaskets that are suitable fits for a variety of sealing processes.


    Chesterton Steel Trap Metal / Graphite Gasket

    Are you dealing with some tricky sealing situations? The Steel Trap / Graphite Gasket will likely solve your issues. The convoluted concentric design of the steel literally traps the graphite as the flange tightens. The resulting compression forms a tight seal that eliminates the risk of leaks and  pressure blow-outs. By reducing vulnerability due to weak compression or too much pressure, this gasket brings you the best of both worlds: leak-proofing and pressure resistance. Its material and design make it less susceptible to temperature and pressure cycling, and when “Live Loaded”, it is similar to a weld.

    • Example applications: Pipe flanges, reactors, heat exchangers, pressure vessels
    • Pressure: 415 bar g (6000 psig)


    Spiral Wound Semi-Metallic Gasket

    The cost-effective sealing solution of the spiral wound gasket is quite versatile because it can be configured in a number of different designs and shapes. It consists of metal windings combined with graphite or PTFE material, as well as supporting rings on the inner and outer sides of the gasket.

    • Example applications: Pipe flanges, reactors, heat exchangers
    • Temperature limit: Graphite sealing layer 450°C (842°F), PTFE sealing layer 300°C (572°F)
    • Pressure: 350 bar g (5075 psig)

    Sheet material gaskets

    Gaskets produced from sheet material tend to be more economical. All Chesterton sheet material gaskets that are distributed by Cotter Marketing, are produced from materials of the highest quality.


    Chesterton 455 Aramid Fibre Gasket

    The Chesterton 455 is a general-purpose Aramid fibre gasket with strong chemical tolerance. However, it should not be used with chlorinated hydrocarbons, or with aromatic and ester ketones. It comes in a sheet composed of a combination of synthetic fibres and a nitrile binder.

    • Example applications: Water, saline solution, oil, alcohol, ketones, ester
    • Temperature limit: 300°C (575°F)
    • Pressure limit: 50 bar g (735 psig)
    • Compressibility: 7 – 17%


    Chesterton 359 Graphite Sheet Gasket

    The very versatile Chesterton 359 is a general purpose gasket, with a high resistance to chemicals, and it is unlikely to decompose at high temperatures. This is attributed to its strong thermal stability. The gasket material consists of a graphite sheet reinforced with stainless steel and is easy to handle.

    • Example applications: Processes of most industrial plants
    • Temperature limit: 870° C (1600° F) non-oxidizing service, 455° C (850° F) oxidizing service
    • Pressure limit: 140 bar g (2000 psig)
    • Compressibility: 35 to 50%


    Chesterton 122NN Diaphragm Sheet Gasket

    The strength of the nylon-reinforced sheet of the Chesterton 122NN is the reason behind its superior performance.

    • Example applications: Water, steam, gas, air, oil, solvents, as well as regulators, and valve actuators. The gasket is ideal when a diaphragm service is needed, for example, to include a cooling device
    • Temperature limit: 93˚C (200˚F) maximum, –0˚C (–0˚F) minimum
    • Pressure limit: 17 bar g (250 psig)

    Form-in-place gaskets

    Form-in-place (FIP) gaskets are more unconventional that their standard fitted cousins. They eliminate the need to figure out exact fittings, and are definitely time-savers. Useful for mechanical assemblies, as well as intricate surfaces.


    860 Moldable Polymer Gasket

    The easy-to-apply Chesterton 860 Mouldable Polymer Gasket is also easy to remove. It forms a very thin gasket, retains its elasticity, and is resistant to vibration.

    Example applications: Housings, fittings, turbine casings, vacuum systems


    Chesterton 185 Expanded PTFE Joint Sealant

    The Chesterton 185 form-in-place joint sealant provides a very easy and fast method of sealing joints. It is resistant to chemicals and is highly stable, even in high-pressure situations. If you’re looking for cost-effectiveness and longevity, the 185 is the solution for you.

    • Example applications: Fume ducts, steam vessel flanges, heat exchangers, hydraulic and pneumatic systems, compressor housing flanges
    • Temperature limit: –270°C (–450°F) to 315°C (600°F)
    • Pressure limit: Full vacuum to 210 bar g (3000 psig)

    Frequently Asked Questions

    What is the difference between a gasket and a mechanical seal?

    Gaskets and seals are both designed to prevent leaks, but the two products perform somewhat differently. Mechanical seals function in rotating machinery and are typically integral parts of the machinery. Gaskets are more static, even if they are form-in-place gaskets or joint sealants. Gaskets need to be fitted to the sizes and positions of the bolts that extend through them, but are easier to replace even if they are customised for a particular function or machine. Some mechanical seals are easily replaceable, but many of them need to be repaired or reinstalled if they break down, often together with the machine itself.

    I need a gasket to be cut with very strict specifications. How can this be done?

    You need look no further than Cotter Marketing’s computerised gasket cutting service. Using state-of-the-art technology, we cut gaskets from all materials, complying with required standards, and at very exacting tolerances where needed. We use templates that are pre-programmed, or we can create one from a sample. Our technology supports virtually any file format.

    What’s the story with manway gaskets?

    There is a known issue from the traditional usage of manway door gasket seals. The gasket tends to weaken at the point of start up, and then again during cooldown, resulting in leaks. Our partner, Chesterton, has come up with a solution for the manway door gaskets for these giant steam drums. We would be pleased to discuss these solutions with you if this issue relates to your plant.

    An interesting final point to ponder

    A gasket is not a standalone device. Its inner and outer workings are very much dependent on the substance that it has been built to control. The flow of the fluids or other media through the system impact the strengths as well as the weaknesses of the gasket. The media both gives the gasket its life, and depends on it for its containment.

    This relationship between a gasket and the flow of media, can be compared to the relationship of Cotter Marketing with both its suppliers and its customers. Our company, together with the quality manufacturers that we work with, enjoys the cohesiveness of our relationship with you, your plant, and your industry.

    Cotter Marketing is very solution oriented, and this supports our holistic approach towards assisting our customers. We provide technology and products, not only in sealing, packing, and gaskets, but we also specialise in non-destructive testing, metal and concrete coating, industrial lubricants, and more.

    We look forward to providing you with solutions and support. We are happy to respond to any enquiries you may have about our company, our services, and our gaskets.

    It’s not just gaskets. Call our team to learn how we can help across your operation.