Thermo Firesleeve Temperature Ratings: The Ultimate Guide

Date: 07/01/26

Thermo Firesleeves from Sleeve It deliver dependable protection in a range of thermal environments, from marine engine rooms to industrial smelting plants. They keep people and plant safe, prevent accidents and breakdowns, and extend the lifespan of key equipment, all of which improve productivity and protect your bottom line.

In this article, we’ll take a closer look at the temperature ratings for Thermo Firesleeve, how those ratings are achieved and how they apply to real-life scenarios and standards.

What Are the Temperature Ratings of Thermo Firesleeve?

Sleeve It’s British-made Firesleeve is thermally rated in two ways: continuous operating temperature and molten splash resistance. It has achieved the following ratings:

• Continuous operating temperature – up to 260°C (500°F), covering the hottest engine bays, marine engine rooms and heavy industrial plants 

• Molten splash resistance – up to 1200°C (2200°F), covering aluminium, copper, cast iron and even gold.

How Does Thermo Firesleeve Achieve These Ratings?

Thermo Firesleeve achieves its impressive thermal performance through a dual-layer design:

• Inner sleeve – a continuous flexible tubular textile sleeve knitted from a texturised, bulked 'E' glass fibre yarn, knitted to form. E-Glass has remarkable properties, including:

  • a tensile strength of 3445Mpa 

  • a compressive strength of 1080MPa

  • no true melting point below 1200°C

  • a thermal conductivity in the range ~0.8 - 1.2Wm-1K-1.

• Outer coating – a high-grade fire-resistant iron oxide silicone elastomer rubber, which melts when exposed to flame, creating a protective layer of silicon dioxide, or silica, which shields the inner sleeve below. The silicone coating has a thermal conductivity of ~0.2Wm-1K-1.

Industry Standards and Compliance

The Thermo Firesleeve temperature ratings help you to comply with a wide range of industry-specific standards, including:

• EN45545-2 – the fire protection standard for the rail industry across Europe

• AS1072 / AS1055E – the aerospace standards for protective firesleeves

• MSHA Certification – the US Mine Safety and Health Administration standard

• EC 60695-11-10 – reaching the classification of HB and V0

• UL94 – achieving the rating of rating V0, V1, V2

• ISO 11925-2 – the international building product safety standard

Why Temperature Ratings Matter: The Cost of Failure

Of course, technical compliance is just one of the benefits of choosing Thermo Firesleeve from Sleeve It. Temperature ratings are more than just academic numbers; they represent protection from real risks in real-life workplaces, in transport and even in remote equipment such as offshore windfarms. 

By choosing Thermo Firesleeve, you get peace of mind protection for your people, your plant and your business as a whole. Without it, you risk equipment failure, expensive shutdowns, injuries to operators and significant reputational damage as you miss deadlines with key clients, who may take their business elsewhere as a result. 

The heat you get from customers, shareholders, the HSE, and so many other directions following an accident may not be as easy to quantify as the physical kind, but it can be just as damaging. But rest assured that installing Firesleeve can protect you from this kind of heat as well as it does from the physical kind. 

Get the Proven Protection of Thermo Firesleeve Today

To find out more about Thermo Firesleeve from Sleeve It, download our technical specification sheet now, or please feel free to contact our technical team with any questions or queries. 

We’re proud of the performance of our product, and we’ll be happy to explain the features and benefits for your business. We’ll help you to select the right fire protection product from the extensive Sleeve It range, to match your needs, meet your industry standards and fit both your equipment and your budget. Just give us a call on 01524 694733, or drop us an email at sales@sleeveit.co.uk

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