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    Frequently Asked Questions

    A list of questions that we frequently encounter from customers:

    How to make gaskets?

    Gaskets are cut from the right material for the job that the gasket has to do. Gaskets are typically manufactured from flexible material, and are cut by either: knife, press, water or laser.

    To make a gasket:

    • Specify dimensions
    • Specify material (or specify material requirements)
    • Send enquiry to manufacturer

    Once we receive an enquiry, we will determine the most suitable method to make your gaskets given the size of the gaskets required, the material from which they’re to be made, and the lead time requested.

    How to remove gaskets?

    As they get older certain gasket materials can either harden or soften and become fixed to metalwork, such as flanges. It is important to remove old gasket material without damaging metal surfaces in the process, as damage can affect future sealing. In certain cases, chemical might be used to help remove old gaskets. If in doubt please contact us for technical help and advice.

    What is the difference between a gasket and a seal?

    There is no hard and fast distinction between a gasket and a seal, and the terms are often used interchangeably. Having said this, gaskets are typically two-dimensional shapes which are used to seal flat surfaces. Gaskets are also typically cut or pressed from flexible materials. In contrast, seals are typically three-dimensional shapes which are moulded or machined.

    Where to buy gasket material?

    We stock many different grades and thicknesses of gasket material: from papers, to rubbers, to non-asbestos materials. We can ship materials, as sheets or rolls, for worldwide delivery.
    You can see our range of gasket material here.

    How to make rubber gaskets?

    Rubber gaskets are typically cut or pressed from sheets of rubber. The method of cutting can vary depending upon the manufacturing process. In addition, there are many different types of rubbers with different properties; and so it is important that gaskets are manufactured from a rubber suited to their intended purpose.

    The best way to make rubber gaskets is to work with an experienced gasket manufacturer. We can advise on the rubber best suited to your application, and the best manufacturing method given your requirements. Please contact us for more information.

    What is the right material for my application?

    The right material for your application will be determined by what you are going to use it for. The easiest way to decide which material is right for your application is to use our Gasket Material Selector and Prosperities of Gasket Materials charts. If in doubt, please contact us for advice.

    What thickness material should I specify?

    As a general rule you should choose the thinnest material possible for your application, as the pressure exerted on the gasket will increase with its thickness. The thickness of the material will be dictated by the state of the flanges in question, and the compression required to seal.

    How do I work out the Outer Diameter (O.D.) and Inner Diameter (I.D.) of my gasket?

    The inner dimension of your gasket is the size of the hole or bore. To calculate the outer dimension of your gasket, measure the outer dimension of the gasket (the full diameter of the gasket).

    How do I determine which Class or Table of gasket I need?

    The easiest way to work out which class or table of gasket you need is to consult our Gasket Dimensions Guide.

    How do I work out the Pitch Circle Diameter (P.C.D.) of my gasket?

    The pitch circle diameter is the diameter that specifies the centre of bolt holes of your gasket. The P.C.D. is measured from the centre of the bore.