Nullifire FZ400: Multi-Purpose Fire Stopping for Modern Buildings

Nullifire FZ400 - A Tested Multi-Purpose Fire Stopping Solution for Movement, Penetrations and Evolving Service Demands

Modern buildings are dynamic environments. They expand, contract, vibrate and flex all while accommodating an increasing density of mechanical and electrical services. In this context, fire stopping solutions must do more than seal an opening; they must maintain fire compartmentation under real world movement conditions while adapting to evolving service configurations.

Nullifire FZ400 has been developed and extensively tested to meet exactly these challenges, delivering high performance GXT fire stopping for

·       linear joints

·       movement service penetrations

·       metal trunking applications (latest test reports)

The latest Tested Solutions for Metal Trunking Fire Stopping

As service distribution evolves, metal trunking systems are increasingly used for cable management within commercial and residential buildings. These systems introduce new fire stopping challenges due to their geometry and material composition.

More recently, FZ400 has been successfully incorporated into metal trunking fire stopping solutions, delivering:

• Tested fire performance within trunking penetrations
• Reduced installation complexity
• Improved consistency across service routes

Engineered for Movement: Linear Joint Fire Stopping

Movement joints are among the most demanding fire stopping applications in any structure. Thermal expansion, wind loading, structural settlement, and building sway can all cause joints to open and compress over time.

FZ400 is designed for use within linear joint fire stopping systems, where it:

• Accommodates dynamic joint movement
• Maintains fire integrity and insulation performance
• Provides reliable compartmentation across walls and floors
• Supports compliance with tested system configurations

By combining flexibility with reactive fire performance, FZ400 ensures that life safety is not compromised when buildings move.

Accommodating movement in Service Penetration Solutions

FZ400 is proven for use in service penetration fire stopping systems where movement is expected, helping to:

• Reduce fatigue and damage to seals
• Reinstate fire compartmentation around services
• Accommodate retrofits
• Support integrity (E) and insulation (I) requirements

Tested to a groundbreaking new methodology

Patented Graphite Expansion Technology

The core of FZ400’s performance is GXT - Nullifire’s patented graphite expansion technology.

In the event of fire:

• The graphite component expands when exposed to high temperatures
• The material increases in volume to seal gaps and voids
• Heat transfer is significantly restricted

This controlled expansion is engineered to respond precisely under fire conditions, forming a robust char barrier that protects against flame spread and insulation failure.

The patent underscores Nullifire’s ongoing investment in innovation; developing advanced intumescent technologies specifically tailored to fire stopping applications. Rather than relying on conventional formulations, Nullifire has engineered a solution that combines flexibility, expansion performance, and system compatibility.

Why Specify Nullifire FZ400?

For specifiers, contractors and fire engineers, FZ400 delivers measurable advantages:

• Tested in linear joint systems
• Proven for service penetration applications where movement is expected
• Suitable for emerging metal trunking solutions
• Accommodates building movement
• Utilises patented graphite expansion technology
• Designed for system-based compliance
• Ease of use and installation - Dryfit /flexible / easy to cut /compressible
• Fire resistant up to 120 mins

By offering one multi-purpose solution across multiple fire stopping scenarios, FZ400 simplifies specification, reduces site complexity and enhances compliance confidence.

A Future-Ready Fire Stopping Solution

As building services become denser and structures more complex, passive fire protection must evolve accordingly. Nullifire FZ400 represents a forward-thinking approach combining advanced Nullifire patented technology with versatile, system-tested performance.

Backed by technical expertise and ongoing innovation, Nullifire continues to lead in delivering fire stopping solutions that not only meet today’s regulations but anticipate tomorrow’s challenges.

Nullifire FZ400.  Intelligent expansion. Proven protection. Built for modern construction.