About

FSi is the UK’s largest manufacturer of passive fire protection products and a proud member of the Etex group.

We specialise in manufacturing fire stopping solutions and cavity barriers designed to support safe, compliant building performance.

Fire Stopping Solutions

Our fire stopping range is developed to help reinstate the fire resistance of walls and floors, supporting effective compartmentation in line with UK regulations and recognised third-party testing standards.

Cavity Barriers

FSi cavity barriers provide essential ventilation under normal conditions while delivering fire protection across a range of façade types, including masonry, ventilated rainscreen systems, and curtain walling.

All core FSi products carry third-party certification, ensuring reliability, compliance, and confidence for specifiers and installers.

Quick Selector Tool

We offer an intuitive online Quick Selector Tool, giving installers fast access to accurate technical information for fire stopping applications. This interactive resource makes it easier than ever to identify the most suitable product for each scenario and maintain compliant passive fire protection on site.

Technical & Specification Support

Our technical team is committed to fast response times, ensuring you get the answers you need without delay.

We also have a dedicated specification team available to support project specifications, along with tailored specification packs for our cavity barrier systems; all accessible via our website.