---
title: "Silicone (VMQ) PTFE Thread Seal Tape"
description: "Silicone (VMQ) PTFE Thread Seal Tape (vinyl-methyl silicone, typically 70 Shore A): inert and physiologically neutral; low tear and abrasion strength."
url: https://engineeringhardware.com/guide/material/silicone-ptfe-thread-seal-tape/
source: Engineering Hardware & Fasteners
---

# Silicone (VMQ) 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.

Silicone (VMQ) PTFE Thread Seal Tape are supplied to vinyl-methyl silicone, typically 70 Shore A. Corrosion behaviour is inert and physiologically neutral; low tear and abrasion strength, the material is non-magnetic, and the usable service range is approx. -60 °C to +200 °C. In practice this grade is used for wide temperature range and food/medical contact, in static seals only.

- **Grade:** vinyl-methyl silicone, typically 70 Shore A
- **Corrosion resistance:** Inert and physiologically neutral; low tear and abrasion strength
- **Magnetic response:** Non-magnetic
- **Service temperature:** approx. -60 °C to +200 °C

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

![Silicone (VMQ) PTFE Thread Seal Tape reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/PTFE-Thread-Seal-Tape.webp)

Silicone (VMQ) (vinyl-methyl silicone, typically 70 Shore A) is used for wide temperature range and food/medical contact, in static seals only. Specified on ptfe thread seal tape it determines the corrosion behaviour (inert and physiologically neutral; low tear and abrasion strength) and the service temperature range (approx. -60 °C to +200 °C); the dimensions are ours rather than a standard's, and are listed in full below.

## Why Choose Silicone (VMQ) for PTFE Thread Seal Tape

Used for wide temperature range and food/medical contact, in static seals only. For ptfe thread seal tape, this matters when inert and physiologically neutral; low tear and abrasion strength is the primary requirement.

## Mechanical & Physical Properties

| Grade designation | vinyl-methyl silicone, typically 70 Shore A |
| --- | --- |
| Magnetic response | Non-magnetic |
| Service temperature | approx. -60 °C to +200 °C |
| Corrosion characteristic | Inert and physiologically neutral; low tear and abrasion strength |

## 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.

## Galvanic & Galling Considerations

Galvanic and galling behavior do not apply to ptfe thread seal tape in Silicone (VMQ) — the relevant compatibility questions are chemical: confirm the elastomer against the fluid, the temperature and any cleaning agents in service, and check the gland or groove dimensions give the intended compression on the section.

## Sizes of PTFE Thread Seal Tape Available in Silicone (VMQ)

| 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 Silicone (VMQ).

Custom manufacturing · Made to drawing

## Need this seal in a grade that is not listed?

Silicone 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

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**US$0.0144 – 0.36**MOQ 10,000 pieces

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Self-Tapping & Thread-Forming Screws

### [DIN7982 SS304 Cross Drive Self Tapping Screw for Closet Wooden Plate Fitting](https://engineeringhardware.com/product/din7982-ss304-cross-drive-self-tapping-screw-for-closet-wooden-plate-fitting/)

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**US$0.012 – 0.12**MOQ 1,000 pieces

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Self-Tapping & Thread-Forming Screws

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ASTM GB DIN ISO As3566 · Carbon Steel

**US$1,800 – 3,000**MOQ 1 box

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Self-Tapping & Thread-Forming Screws

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**US$2.40 – 4.80**MOQ 2 bags

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Self-Tapping & Thread-Forming Screws

### [304ss Phillips Pan Head Sharp Point M3-M5 Round Head Self-Tapping Fasteners Screws](https://engineeringhardware.com/product/304ss-phillips-pan-head-sharp-point-m3-m5-round-head-self-tapping-fasteners-screws/)

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## Applications & Industries

What PTFE Thread Seal Tape are specified for, industry by industry. 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 Silicone (VMQ)?

The practical service range is approx. -60 °C to +200 °C.

### Are Silicone (VMQ) PTFE Thread Seal Tape magnetic?

Silicone (VMQ) PTFE Thread Seal Tape are non-magnetic.

### What corrosion resistance do Silicone (VMQ) PTFE Thread Seal Tape offer?

Silicone (VMQ) PTFE Thread Seal Tape provide inert and physiologically neutral; low tear and abrasion strength with a service range of approx. -60 °C to +200 °C.

### Which media is Silicone (VMQ) suitable for?

Silicone (VMQ) suits dry heat and cold in static service, and food contact. It is the wrong choice for dynamic duty, fuel and steam — it tears and abrades easily. 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