--- title: "FKM (Viton®-type) PTFE Thread Seal Tape" description: "FKM (Viton®-type) PTFE Thread Seal Tape (fluoroelastomer, typically 75 Shore A): excellent resistance to heat, fuels, and most chemicals; poor with ketones" url: https://engineeringhardware.com/guide/material/fkm-ptfe-thread-seal-tape/ source: Engineering Hardware & Fasteners --- # FKM (Viton®-type) PTFE Thread Seal Tape Seals · Trade series (PTFE thread sealing tape, colour-coded by density) Temperature range, chemical and fluid compatibility, hardness and the full dimensional range for this compound. FKM (Viton®-type) PTFE Thread Seal Tape are supplied to fluoroelastomer, typically 75 Shore A. Corrosion behaviour is excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam, the material is non-magnetic, and the usable service range is approx. -20 °C to +200 °C. In practice this grade is specified where temperature or chemical exposure exceeds nitrile. - **Grade:** fluoroelastomer, typically 75 Shore A - **Corrosion resistance:** Excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam - **Magnetic response:** Non-magnetic - **Service temperature:** approx. -20 °C to +200 °C Property values are typical for the grade. Certified mechanical test data is available on request for production orders. ![FKM (Viton®-type) PTFE Thread Seal Tape reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/PTFE-Thread-Seal-Tape.webp) Material page for ptfe thread seal tape in FKM (Viton®-type) (fluoroelastomer, typically 75 Shore A). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam and the service range is approx. -20 °C to +200 °C. ## Why Choose FKM (Viton®-type) for PTFE Thread Seal Tape Specified where temperature or chemical exposure exceeds nitrile. For ptfe thread seal tape, this matters when excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam is the primary requirement. ## Mechanical & Physical Properties | Grade designation | fluoroelastomer, typically 75 Shore A | | --- | --- | | Magnetic response | Non-magnetic | | Service temperature | approx. -20 °C to +200 °C | | Corrosion characteristic | Excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam | ## Corrosion Behavior in Service Carbon and alloy steel ptfe thread seal tape require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use. ## Comparable Grades For ptfe thread seal tape, consider NBR where the service is ordinary mineral oil and the cost matters, or EPDM for hot water and steam, which attacks FKM. Elastomer selection is decided by the medium, the temperature range and whether the seal is static or dynamic — not by strength. ## Sizes of PTFE Thread Seal Tape Available in FKM (Viton®-type) | Colour | Density | Intended service | Notes | | --- | --- | --- | --- | | white | standard density | water and general plumbing | general purpose | | pink | high density | water, larger threads | thicker, fewer wraps needed | | yellow | high density | gas lines | gas-rated tape | | green | oil-free, degreased | oxygen service | must be oxygen-clean | | grey | with filler | stainless steel threads | reduces galling on stainless | Dimensions are independent of the material: every size above is available in FKM (Viton®-type). Custom manufacturing · Made to drawing ## Need this seal in a grade that is not listed? Fkm is one of the grades the catalog describes. Inside diameter, cross-section and compound are the three that matter, and the compound is chosen against the fluid and the temperature rather than the dimensions. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom seal manufacturing](https://engineeringhardware.com/custom/seals/)[Send a drawing](https://engineeringhardware.com/custom/seals/#rfq) ## Technical Drawing Dimensioned line drawing of white PTFE Thread Seal Tape to Trade series (PTFE thread sealing tape, colour-coded by density). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Density:** standard density - **Intended service:** water and general plumbing - **Notes:** general purpose ## Dimensions & Specifications (Trade series (PTFE thread sealing tape, colour-coded by density)) | Colour | Density | Intended service | Notes | | --- | --- | --- | --- | | white | standard density | water and general plumbing | general purpose | | pink | high density | water, larger threads | thicker, fewer wraps needed | | yellow | high density | gas lines | gas-rated tape | | green | oil-free, degreased | oxygen service | must be oxygen-clean | | grey | with filler | stainless steel threads | reduces galling on stainless | Product catalog ## Related Thread Sealants & Threadlockers products [![Malaxy 304 Stainless Steel Hex Washer Head Thread Cutting Screw Slotted Drive Zinc Plated for Metal Roofing 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Stocked from white to grey (inside diameter). ### Industries that specify PTFE Thread Seal Tape - **Gas installation:** Gas-rated tape only. - **Process plant:** Stainless thread assembly. - **Plumbing:** Tapered pipe threads. - **Compressed air:** Fitting and manifold joints. - **Hydraulics & pneumatics:** Static and dynamic sealing in cylinders and valve bodies. - **Process & food equipment:** Sealing at joints that are cleaned and inspected. ### Typical applications - using the grey filled tape on stainless to reduce galling - keeping tape off the first thread so nothing enters the line - wrapping in the direction the fitting will turn - choosing the colour that matches the service - sealing a joint against fluid or air pressure - excluding dust and moisture from a housing ### Service conditions to specify against - **Sealed joints:** Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life. ### Where to use something else - Do not use general-purpose white tape on an oxygen line; oxygen service needs tape that is certified oil-free, and this is a safety requirement rather than a preference. [Full application guide: where PTFE Thread Seal Tape are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/ptfe-thread-seal-tape/) Inside the plant ## Manufactured in our own plant This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided. 1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift. 2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g. 3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1. 4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227. ## Frequently Asked Questions ### What's the service temperature limit for FKM (Viton®-type)? The practical service range is approx. -20 °C to +200 °C. ### Are FKM (Viton®-type) PTFE Thread Seal Tape magnetic? FKM (Viton®-type) PTFE Thread Seal Tape are non-magnetic. ### What corrosion resistance do FKM (Viton®-type) PTFE Thread Seal Tape offer? FKM (Viton®-type) PTFE Thread Seal Tape provide excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam with a service range of approx. -20 °C to +200 °C. ### Which media is FKM (Viton®-type) suitable for? FKM (Viton®-type) suits fuels, mineral and synthetic oils, and most acids and solvents. It is the wrong choice for hot water and steam, ketones, esters and amines. Elastomer selection is decided by the fluid first, then the temperature, then whether the seal is static or dynamic. ### How do I request a quotation? Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day. ## Related Pages [View the full PTFE Thread Seal Tape page](https://engineeringhardware.com/fastener/ptfe-thread-seal-tape/) ### More PTFE Thread Seal Tape Guides