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BS EN 1366-4:2021: Fire Resistance Tests for Service Installations and Linear Joint Seals

Fire safety standards are crucial in shaping the safety parameters within which our buildings and infrastructures operate. Among these standards, the BS EN 1366-4:2021 stands out as an essential regulation focused explicitly on service installations and linear joint seals.

A UKTC worker writing down data from a fire test

Introduction to BS EN 1366-4:2021

BS EN 1366-4:2021 is part of the European standards that assess various service installations' fire resistance. It mainly focuses on the performance of linear joint seals under fire exposure conditions. BS EN 1366-4-2021 supersedes EN 1366-4:2006+A1:2010, which is withdrawn. Withdrawn standards are no longer considered valid, and their use may not meet current safety standards.

The Importance of Linear Joint Seals in Fire Safety

Linear joint seals play a pivotal role in preventing the spread of fire and smoke through gaps and joints in doors. By adhering to BS EN 1366-4:2021, manufacturers and builders can ensure these seals maintain their integrity during a fire, safeguarding the building's occupants and assets.

Key Aspects of the Testing Process

In the EN 1366 series, this specific part provides a method for determining how well certain linear joint seals can withstand exposure to fire, considering their intended use. However, it's important to note that this standard doesn't apply to perimeter seals commonly found in curtain walling systems.

This standard includes various tests designed to assess the performance of these seals, as outlined in BS EN 1366-4:2021:

· No mechanical movement

· Mechanical movement

It's important to emphasise that these tests don't provide precise quantitative data about parameters such as the rate of smoke or hot gas leakage or the generation of fumes. Instead, they describe the general behavior of the test specimens during the evaluation. This information is included in the test report to provide an overall understanding of the seal's performance.

Importantly, this part of the EN 1366 series doesn't address the load-bearing capacity of linear joint seals. It does not provide any information about how the inclusion of these seals may affect the load-carrying capability of the structure or separating elements. The focus is primarily on fire resistance and related factors.

These rigorous tests ensure that the seals can withstand extreme conditions and continue to serve their protective purpose.

How the BS EN 1366-4:2021 Impacts the Construction Industry

Compliance with this standard is not just a matter of regulatory adherence. It's a testament to a building's safety standards. Constructors and architects across the UK rely on this certification to endorse their projects as fire-resistant and safe for occupants.

At UKTC, we prioritise the safety and compliance of our clients' products. We are currently accredited by UKAS to carry out BS EN 1366-4:2021 testing, giving our clients a market-leading route to market.

In search of a dedicated partner for your testing and certification needs? Contact us at or call us on 01355 433122; our experienced team will be delighted to assist you.


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