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Our guide to GYLON gaskets

Our guide to GYLON gaskets

Have you caught on to the unique properties of Garlock’s range of GYLON gaskets? This impressive material scores highly for its excellent chemical resistance, broad operational temperature range, and high tensile characteristics. In this article, Martin’s Rubber Company talks you through the composition and credentials of GYLON gasket material.

Martin’s Rubber Company is pleased to announce that we are now supplying GYLON gasket products from Garlock; the global leader in high-performance fluid sealing and pipeline protection products. While you may not of have heard of this unique material, we’re certain that by the time you’ve read this blog, you’ll almost certainly want to hear more.

What is GYLON?

GYLON is a PTFE material, available in a range of grades for specific applications and/or industries. It is manufactured using a proprietary process that imparts unique physical properties that are not obtainable through conventional manufacturing methods. GYLON gaskets are designed for severe chemical service and are color-coded for easy identification.

Advantages of GYLON gasket material

With outstanding chemical resistance for harsh environments, and an excellent temperature range, the Garlock branded GYLON material also addresses the issues of creep and cold flow that would usually be seen with virgin materials and those not manufactured using this unique Garlock process.

As part of the innovative GYLON gasketing process, PTFE and fillers are reoriented to increase the material’s tensile properties and decrease creep relaxation problems usually associated with PTFE products. Thanks to this mixing process, you can expect a homogenous material that displays consistent, superior physical properties that, unlike inexpensive skived PTFE sheet materials, don’t fluctuate from one side of the sheet to another.

GYLON gaskets offer superior sealability, reducing process and media loss, as well as fugitive emissions, reduced creep and cold flow characteristics. A patented thermal bonding process is also employed to fabricate virtually any size gasket.

GYLON gaskets from Martin’s Rubber

Martin’s Rubber can supply the following types of GYLON gaskets, which can operate in temperatures ranging from -268 to +260°C, pressures ranges between 800 and 1200 PSI, and come in thicknesses ranging from 0.4mm to 6.4mm.

GYLON Style 3500 (Fawn GYLON consists of PTFE with a silica filler, offering improved performance over standard PTFE materials, as well as reducing creep relaxation and cold flow. This grade of GYLON is suitable for use with strong acids (not hydrofluoric), solvents, hydrocarbons, water, steam, chlorine and cryogenics. GYLON Style 3504 and Style 3505 (Blue GYLON are composed of aluminosilicate microspheres, suitable for use with moderate concentrations of acids and some caustics, hydrocarbons, solvents, water, refrigerants, cryogenics and hydrogen peroxide. The Style 3505 is additionally NSF61 approved for oxygen service.

Meanwhile, GYLON Style 3510 (Off-white GYLON) is comprised of PTFE with a barium sulphate filler. It has been developed to provide excellent resistance to high concentrations of caustics, which are commonly found in the pulp and paper industry. It is suitable for use with strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, cryogenics and aluminium fluoride.

GYLON Style 3540 Microcellular PTFE is highly compressible, which means that it seals under low bolt load and is therefore suitable for non-metallic flanges and will conform to warped or scratched flanges. This type of GYLON gasket is suitable for use with strong caustics, strong acids, hydrocarbons, chlorine and cryogenics. The GYLON Style 3545 has similar high compression characteristics, and is suitable for use with similar media as the 3540. However, these FDA approved gaskets differ in that they have outer layers with a rigid PTFE core, which reduces cold flow and creep.

Finally, GYLON Style 3565 ENVELON is PTFE gasketing with aluminosilicate microsphere filler. A soft, deformable exterior conforms to surface irregularities, while the stable blue core improves cold flow resistance. A low bolt-load requirement means that a tight seal can be achieved on glass-lined or imperfect flanges, and the direct sintering of GYLON layers prevents leaks and adhesive contamination. This type of GYLON gasket is suitable for use with moderate concentrations of acids and caustics, hydrocarbons, solvents, cryogenics and glass-lined equipment.

Find out more about our GYLON products by speaking to us on 023 8022 6330, or email sales@martins-rubber.co.uk.

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