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GuideDiode Trading EST · 6 min read
31 October, 2026 | 
AdminShort answer: Use PTFE gaskets for aggressive chemicals and CNAF (compressed non-asbestos fibre) for general duty with steam, oils, water and gases. Diode Trading EST is a ptfe gasket sheet supplier saudi arabia and also stocks CNAF sheet in Dammam, so you can buy both families from one source.
Most flange leaks trace back to choosing a gasket that does not match the fluid or the bolt load. The two materials in this guide cover a large share of everyday plant gasket work, and they complement each other.
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PTFE (polytetrafluoroethylene) resists virtually all industrial chemicals, has a wide temperature range and is non-contaminating. That is why it is used in chemical processing, food, beverage and pharmaceutical pipework. Its weakness is cold flow: under sustained bolt load, plain PTFE slowly deforms, and bolts can lose tension.
Three styles address this:
Many buyers ask for ptfe envelope and expanded gaskets together because they cover the two most common problems: chemical attack and poor flange surfaces. Envelope gaskets are widely used on glass-lined vessels and pipes, and on chemical lines where a full metal flange face is available.
CNAF is made from aramid and mineral fibres bound with rubber and compressed into sheet. When you look for a cnaf compressed fiber gasket supplier, expect the sheet to be cut into ring and full-face gaskets for flanges in water, steam, oil, fuel and gas systems. Grades differ in temperature and pressure capability, so confirm the grade against your duty.
Because asbestos has been phased out in industry, a good non-asbestos gasket sheet ksa supplier will make clear that the material is asbestos free. CNAF is a general-purpose replacement for older asbestos jointing in many applications, though limits for strong acids and alkalis are lower than PTFE.
| Feature | PTFE | CNAF |
|---|---|---|
| Chemical resistance | Excellent | Moderate |
| Temperature | Wide, depends on style | Depends on grade, good for steam |
| Creep | Plain grades creep | Low |
| Bolt load needed | Low (expanded) to medium | Medium to high |
| Cost | Higher | Lower |
| Typical use | Acids, solvents, hygienic lines | Steam, oil, water, gas |
Always confirm pressure and temperature limits with the data sheet for the specific grade.
Do not over-tighten PTFE joints; follow a staged cross pattern, and re-check the torque after the system has been heated and cooled once if the application allows. For CNAF, avoid reusing gaskets and avoid thick gaskets on high-pressure joints. Keep sheets flat and away from oil and UV before use.
The first is using plain PTFE where high bolt load will make it creep, leading to loosened joints. The second is selecting CNAF for strongly acidic or alkaline service, where it can degrade. Third is using thick sheet where a thin gasket would seal better and resist blowout more effectively. Finally, many leaks are caused by mixing up materials after cutting, so label gaskets by material and size, especially in kits.
Most of these mistakes are avoided by sharing the full duty with your supplier before ordering. A short conversation or a WhatsApp message with fluid, temperature, pressure and flange type is usually enough to point to the correct sheet.
If you are not sure whether a joint needs PTFE or CNAF, send us the fluid and temperature and we will recommend. In mixed-service plants it is common to stock both and pick by line list, using CNAF for utilities and PTFE for chemical lines, rather than trying to find a single material for the whole site.
CNAF is an asbestos-free sheet widely used as a replacement in many applications, subject to its grade limits.
A PTFE shell wrapped around a core, usually compressed fibre or rubber, used for chemical flanges.
Both can be quoted. Provide sizes and quantities.
Ask for it with your quote request and tell us the grade you need.
Tell us the material, thickness or size, quantity and application for your PTFE or CNAF gasket order. Everything we list is in stock and ships from our Dammam warehouse, with export across the GCC. Send your list through our request a quote page, message us on WhatsApp at +966 56 838 3649, or email sales@diode.sa.
Buyers searching for an expanded ptfe gasket sheet manufacturer will find that Diode supplies from stock rather than manufacturing. You can request expanded ptfe gasket sheets saudi arabia wide from our Al Khobar and Dammam stock.
Diode is a ptfe and non-asbestos gasket supplier saudi arabia customers can contact directly. We also stock ptfe rubber cnaf gasket sheets gcc buyers ask about.
Yes. As a non asbestos gasket supplier gcc projects can rely on for availability, and equally a non-asbestos gasket supplier gcc buyers search for, we confirm thickness and sheet size on request.
We list rubber & cnaf gasket sheets gcc customers need, and we act as a cnaf gasket sheet supplier saudi arabia can order from. Message WhatsApp +966 56 838 3649 with your thickness and quantity.
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Stock in Dammam · MTC with every order
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