PYROSLEEVE - Hook & Loop Closures

Fabricated in-house by Pyroglass, our PYROSLEEVE Velcro Closures are manufactured from ‘E’ glass fibre yarn knitted to form a tape, coated on one side with high grade silicone elastomer rubber and finished with a flame retardant hook and loop fastening.

The hook & loop fastening makes these products an ideal solution for protecting hose assemblies / pipework

which have already been installed. Retro-fitted Velcro Closures can protect cables & hoses from high ambient temperatures and help protect critical components in the event of an emergency.

Our Pyrosleeve hook & loop closures offer continuous protection at an operating temperature of 250°C and can withstand molten metal splash at 1200°C .

Applications include:

Protecting hose & cable assemblies from high heat sources
Protecting hose & cable assemblies from molten metal splashes
Protecting personnel from burns when working near hot gases, steam lines etc.
Fire suppression systems

Typically used in the following industries:

Mining
Rolling stock / underground railways
Automotive - Heavy Goods Vehicles
Marine - yachts / ships
Steam rooms / boiler houses
Wind turbine power generation

Certification:

Accepted by MSHA (Acceptance Number: IC-0413/0001) – ASTP 5007
Rated V-0 for flammability: UL94 / IEC 60695-11-10 Test Method
BS EN 45545-2:2020+A1:2023 European fire safety requirements for materials and components used in railway vehicles
BS EN ISO 4589-2:2017 Determination of Burning Behaviour by Oxygen Index
ISO 5659:2026 Smoke Generation - Determination of Optical Density
NV X 70-100-1: 2006 & NF X 70-100-2: 2006 – Quantitative Analysis of Gases Produced Under Specific Conditions of Thermal Degradation in the Presence of Air

Contact our engineers to find out more

Available in a wide range of bore sizes: 25mm - 115mm

Supplied in custom lengths to suit customer requirements.

Fully REACH & RoHS Compliant and Conflict Minerals free.

Product Gallery

What temperature will glass fibre seals operate at?

Depending upon the application glass fibre seals are capable of withstanding 600°C
Do you have any products which operate at temperatures > 600°?

Yes, we do have certain special materials - please contact our Sales Dept. to discuss.
What is your order processing time?

It depends upon the product(s) and quantity needed. We are a manufacturer so there is usually a production lead time.
For most orders we can turn them around within 10-12 working days but it is always a good idea to check with us first. Lead times can also vary according to the time of year. In the heating season we do get very busy.
What temperature will the adhesive backing on glass fibre seals/tapes withstand?

The adhesive backing is purely a 'fixing aid' during assembly. The adhesive backing will degrade at temperatures of 180°C or above but has served its purpose once the glass fibre seal/tape is held in place by some other mechanical means.
What is the best way to start to remove the amber release film at the beginning of the roll of adhesive backed product?

Sometimes it can be a little fiddly to start but there is a technique and if you contact our Sales Dept. we can provide a detailed instruction.

What is the difference between a 'woven' and a 'knitted' tape?

Woven tapes are constructed with warp and weft threads in an over and under construction whereas knitted tapes are formed with a series of interlocking 'loops' like a knitted sweater.
Which is better 'knitted' or 'woven' tape?

Woven tapes are often less flexible than knitted tapes. It depends upon the application as to which is considered better. Knitted tapes are very soft and conformable. They bed down well and are perfect for taping awkward shapes. Both woven and knitted tapes have their place.
How do I prevent the end of a glass fibre seal or tape from fraying when cut?

We recommend the use of our adhesive backed glass cloth tapes for end sealing.
How many turns of adhesive glass cloth tape should I apply to the seal?

We recommend one and a half turns as a minimum.
What can I use on the ends of the firesleeve when it is cut?

We recommend our silicone rubber self-amalgamating tape to seal the end.

World Class Bespoke
Product Manufacturing

Why not give us a call to discuss how our existing selection of sealing and insulating products could be a good fit for your need. Our Pyroglass team is friendly, experienced and passionate about delivering a practical solution that best suits your needs.

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Our knowledgeable team have the resources and experience to advise you on the most appropriate solution that fits your needs.

Send us your details and one of our engineers will contact you directly.

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Our Products

We produce a variety of ready to use products suitable for many industrial and domestic applications. If you are looking for a one off solution, we can put you in touch with your nearest Pyroglass Distributor who can quickly fulfill your need. Alternatively if you are looking for a bespoke manufactured insulating or sealing product, we can provide a range of unique options that suit your business.