Heat Resistant Exhaust Wrap: What It Is and How It Works

Date: 21/05/26

Heat loss in your exhaust system can not only cause damage to surrounding cables and engine components, but it can also harm performance. That’s why more and more people are turning to heat resistant exhaust wrap to boost power, safety and longevity of both auto engines and industrial machinery.

But what exactly is a heat resistant exhaust wrap? What are they made of, and how do they work?

What is a heat resistant exhaust wrap?

Also known as a thermal exhaust sleeve, a heat resistant exhaust wrap is a covering that goes over exhaust pipes to keep exhaust gases hot and keep the surrounding engine bay cool. 

Here at Sleeve It, we make our exhaust sleeves out of knitted basalt fibre yarn for the ultimate in thermal protection and performance. Our thermal exhaust sleeves can operate at continuous temperatures of up to 750°C.

What is basalt fibre?

Basalt fibre is born in heat. It is created by melting volcanic rock, which is rich in silica and iron. This is then drawn out into very long, extremely thin fibres – a bit like making candyfloss. As the basalt cools, it does not form fragile crystals, but retains an amorphous structure that is flexible, strong and chemically resistant. 

As a result, the yarn woven from these basalt fibres is very stable at high temperatures, yet remains strong and flexible. Crucially for engine bays, basalt fibre yarn resists oils, motor fuels and hydraulic fluid. 

What are the benefits of heat resistant exhaust wraps?

Heat resistant exhaust wraps deliver both thermal protection and performance enhancement by:

• Keeping the engine bay cool – thermal exhaust sleeves reduce engine bay temperatures by up to 50%. This helps in several ways:

  • Protecting wiring and other components

  • Keeping mechanics safer when working on engines 

  • Reducing long term thermal fatigue

• Keeping exhaust gases hot – heat resistant exhaust wraps retain heat in the exhaust gases, making them flow faster. This results in:

  • Spent gases are being pulled out of the cylinders more efficiently, increasing performance

  • Faster and hotter gas flow through catalytic converters, reducing emissions

Why choose Sleeve It for heat resistant exhaust wraps?

Sleeve It is the expert when it comes to protecting your equipment and your people from heat sources. Our products are tried and tested everywhere, from deep mining equipment to road and rail applications, and they are trusted around the world by a host of leading brands and operators.

We have a huge range of thermal protection products available, from our world-famous Firesleeve to a comprehensive selection of silicone and glass fibre products. So whatever you want to protect, whatever the operating or peak exposure temperatures are, our team can help.

Flexible, dependable protection

Sleeve It thermal exhaust sleeve is available in a flexible 102mm interior diameter, with a nominal thickness of 4mm, and it is suitable for most exhaust systems. It’s designed to be flexible and expandable to fit over the most awkward bends, curves and junctions, and it won’t snag on welds.

You can order in boxes, with lengths up to 30m, or we can supply your heat resistant exhaust wrap cut to length for the ultimate in convenience.

If you need a different interior diameter, this could be arranged, subject to minimum order quantities and potential future volumes. Please ask our expert team for details.

Boost performance and protect your engine bay today

Get more from your engine and your engineers, while emitting less into the environment, by fitting heat resistant exhaust wrap to your engine bay today.

To find out more about the Sleeve It thermal exhaust sleeve, get in touch right now by completing our contact form online. Alternatively, you can simply start your order online by adding a thermal exhaust sleeve to your enquiry basket.

Frequently asked questions about heat resistant exhaust wraps

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