Introducing Nullifire FZ400: The Pioneering ‘Movement-Tested’ Fire Stopping Solution
- dcb1960
- Jun 6
- 2 min read
Updated: Jun 7
Nullifire, a leader in passive fire protection innovation, proudly unveils FZ400 – a cutting-edge fire stopping product designed to accommodate movement, while maintaining the integrity of compartmentation. Powered by patented GXT Technology, FZ400 provides the necessary continual relief of fatigue on fire stopping seals under deflection stress and protects service penetration seals with outstanding fire performance and movement-resilience.
The FZ400 has been rigorously tested to EN 1366-3/4, achieving up to 2 hours fire rating after undergoing cyclic movement, proving its effectiveness in real-world scenarios where structural movement is inevitable. Using Nullifire's pioneering ‘Movement Test,’ developed with the support of Warrington Fire, the FZ400 was subjected to a groundbreaking procedure that replicates ceiling deflection. A wall was moved up and down by 30mm more than 50 times over a 2-hour period, then placed in a furnace to assess performance post-movement.
FZ400 is a graphite impregnated open cell foam with a highly expansive char when exposed to heat. The water resistant film provides a cold smoke seal. This provides both flexibility and excellent fire stopping properties.
The results were outstanding:
No ripping, cracking, or fibre migration
Maintained a secure, air-tight fire seal
Up to 2 hours of fire resistance maintained
The FZ400 properties are
Tested to EN 1366-3/4 – Up to 2 hours fire resistance post-movement
Nullifire’s Patented GXT Technology – Combines flexibility with superior fire protection
Easy to install – Dry fit, cut-to-size, compressible, and lightweight
Zero fibre migration
Retrospective fitting capability
Creates a dynamic seal that accommodates building movement
Hannah Eyres, Technical Manager at Nullifire, explained “Our Movement Test provides a complete framework for testing how GXT Technology adapts to real-life building pressures. We’re proud to share a test that reinforces our drive toward data-driven solutions and gives architects and contractors complete confidence in FZ400. Feedback has been very positive. Architects and Main Contractor clients demand data driven solutions so the development and success of this test will be well received in the Construction Industry.”
