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GuideDiode Trading EST · 4 min read
07 November, 2026 | 
Admin
How to specify PTFE gaskets is a common question for maintenance and procurement teams. A gasket that is the wrong size, thickness or grade will leak, creep or fail early, and flanges can be damaged. This guide lists what to define so you get the right gasket on the first order.
PTFE gaskets are used where chemical resistance and temperature matter, in petrochemical, chemical, food and pharmaceutical plants.
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Give the flange standard, nominal size and pressure class, or the inside and outside diameters and bolt-hole details. Gaskets are cut to flange dimensions, so accurate sizes avoid rework. If you have a drawing or a sample gasket, send it.
Thicker gaskets conform better to rough flanges but can creep more under load. Thinner gaskets suit smooth flanges and tight spaces. We can recommend a thickness based on flange condition, pressure and temperature.
Plain PTFE gaskets are cut from sheet. Envelope gaskets wrap a softer filler in a PTFE skin to give both chemical resistance and elasticity. Filled PTFE gaskets use glass or other fillers to reduce cold flow. See PTFE gaskets and PTFE envelope gaskets.
Virgin PTFE suits most chemicals and food or pharmaceutical use. Filled grades suit higher loads. Tell us the medium, temperature and pressure so that we can match the grade. Our PTFE grades guide explains the options.
We can cut gaskets to your flange sizes and machine custom parts to drawings. For one-off or urgent jobs, send the dimensions and quantity. See PTFE machined components for finished components.
Use clean flange faces, correct bolt torque and a tightening sequence. Re-torque if your procedure requires it, because PTFE can relax. Do not reuse a PTFE gasket that is deformed or damaged.
If a gasket keeps failing, review grade, thickness and design. Our gasket failure case study shows how the right PTFE grade solved a recurring failure.
Common errors include choosing a gasket that is too thin for a rough flange, using plain PTFE where cold flow is a risk, and over-tightening the bolts, which can squeeze the material out. Another mistake is not stating the medium and temperature, which makes it impossible to confirm the grade. Always give the full duty when you ask for a quote.
For critical flanges, keep a few spare gaskets in the correct size and grade so a leak can be fixed during the next stop without waiting for new material. We can cut gaskets to your list and supply them with a Material Test Certificate, so your maintenance team has traceable spares on the shelf.
Diode Trading EST supplies industrial PTFE (Teflon) to factories, petrochemical plants and oil and gas companies, with a Material Test Certificate (MTC) on every order. Our warehouse is in Al Khalidiyah Ash Shamaliyah, Dammam 32231, and we ship across Saudi Arabia. Send the product, grade, size and quantity to sales@diode.sa or engineeringplastics@diode.sa, or call +966 51 083 8213, and we will quote. You can also download the virgin PTFE technical datasheet.
Flange size and standard, pressure class, medium, temperature and quantity, or a drawing.
Yes, we cut and machine gaskets to your dimensions.
Yes, a Material Test Certificate with every order.
This guide on how to specify ptfe gaskets is a starting point. For more help with how to specify ptfe gaskets, send us your application, temperature and size and we will recommend the right specification. Background reading: PTFE on Wikipedia.
PTFE cluster: PTFE products in Saudi Arabia · PTFE gaskets · PTFE envelope gaskets · PTFE sheets · PTFE grades guide · gasket failure case study
The right choice for how to specify ptfe gaskets depends on your site, material and order size. Diode Trading EST supports how to specify ptfe gaskets projects across Saudi Arabia, so send us your requirements for a quote. Ask our team to review your how to specify ptfe gaskets requirements before you order. For more detail on how to specify ptfe gaskets, contact Diode Trading EST. We can also advise on how to specify ptfe gaskets specifications and delivery.
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Read moreDiode Trading EST supplies these PTFE (Teflon) Products from stock in Dammam, with delivery across Saudi Arabia and the GCC.
Stock in Dammam · MTC with every order
Need a price or lead time? Talk to our sales team.
