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Read moreSkived vs Molded vs Expanded PTFE Sheet: What Is the Difference?
01 October, 2026 | Admin
PTFE sheet is not one product. In a skived vs molded PTFE sheet comparison, and when expanded PTFE is added, you are looking at three different manufacturing processes, each giving different mechanical properties even though the base resin is the same PTFE. Understanding the difference helps you avoid ordering the wrong sheet for a gasket, lining or fabricated part.
The Three Processes Compared
| Process | How It Is Made | Best For |
|---|---|---|
| Skived | A large PTFE billet is peeled (skived) into thin continuous sheet, like peeling a log for veneer | Large-format, thin, consistent gauge sheet |
| Molded | PTFE is compression molded into a block, then machined or sliced to thickness | Thicker sheet, tighter dimensional tolerance |
| Expanded (ePTFE) | PTFE is mechanically expanded, creating a porous, highly compressible structure | Gasket sheet needing high conformability on imperfect flange surfaces |
Skived PTFE Sheet
Skiving produces continuous, wide-format sheet in consistent thin gauges. It is the common choice for large-area lining and general fabrication stock, where a big continuous sheet is more practical than smaller molded pieces. Because the sheet is cut from a billet, the surface carries a fine tool finish that is usually acceptable for lining, wrapping and general gasket cutting.
Molded PTFE Sheet
Molded sheet is produced in thicker gauges with tighter dimensional control. It is generally used where thickness consistency and dimensional precision matter more than sheet size, such as gasket stock for precision cutting. Molded stock is also the natural starting point for machined parts such as washers, bushes and seats, and is available in virgin and filled grades. See our range of virgin PTFE sheets and rods and PTFE sheet in skived, molded and expanded forms.
Expanded PTFE (ePTFE) Sheet and Gasket
Expanded PTFE has a porous, highly compressible structure that conforms readily to imperfect or damaged flange surfaces. This is a real advantage for older piping systems or flanges that are not perfectly flat, where standard skived or molded sheet gaskets might not seal reliably. The trade-off is that ePTFE is a soft, conformable material and is selected for sealing rather than for machining or structural parts.
How to Choose Between the Three
- Need thin, wide, continuous sheet: choose skived.
- Need thick stock or tight thickness tolerance: choose molded.
- Sealing against worn or uneven flanges: choose expanded (ePTFE).
- Need a filled grade for wear or creep resistance: molded stock is usually the starting point; compare options in our PTFE grades guide.
Practical Notes for Gasket Buyers
For flat, well-maintained flanges, a skived or molded sheet cut to a standard shape works well. Where a project needs finished parts rather than raw sheet, consider PTFE gaskets or ready-cut gaskets supplied to your flange size. State the process, thickness, grade and flange condition when you enquire, so the correct sheet is quoted first time.
Frequently Asked Questions
Which PTFE sheet type is best for a standard flange gasket?
For flat, well-maintained flanges, skived or molded sheet cut to a standard gasket shape works well. For older or imperfect flange surfaces, expanded PTFE (ePTFE) gasket material's higher conformability often provides a more reliable seal.
Are skived, molded and expanded PTFE the same material?
They start from the same PTFE resin, but the three manufacturing processes produce different structures and mechanical properties, so they are not interchangeable.
Which process gives the tightest thickness control?
Molded sheet is generally the choice where thickness consistency and dimensional precision matter, such as gasket stock for precision cutting.
Request a Quotation
Send your required thickness, sheet size, grade and quantity to our Al Khobar team, with flange details if the sheet is for gaskets, and we will recommend and quote the right PTFE sheet.
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