Seals · Trade series (PTFE thread sealing tape, colour-coded by density)

Silicone (VMQ) PTFE Thread Seal Tape

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.

For ptfe thread seal tape in Silicone (VMQ), the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for Silicone (VMQ) (vinyl-methyl silicone, typically 70 Shore A) is summarized below together with every size supplied.

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

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Specification

Item / category Standard Size(s) Material / finish Quantity

Business Information

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Notes

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

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

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.

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.
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.
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.
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

Can Silicone (VMQ) replace stainless steel structurally?

No — stainless A2/A4 cannot match class 10.9 / 12.9 strength. Stainless is selected for corrosion, not raw strength.

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.

When should I move from vinyl-methyl silicone, typically 70 Shore A to class 8.8 for PTFE Thread Seal Tape?

Step up to class 8.8 when the joint preload approaches the proof load of the current class. The higher class adds preload at the same diameter, often saving size and weight.

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.