Nullifire FJ400 Intuspan Intumescent Joint Filler - All Sizes

• Up to 2 hours fire resistance - Tested to BS EN 1366-4 and BS 476 Pt 22.
• Ideal for high vibration areas, such as elevator shaft interfaces.
• Unaffected by moisture.
• Easy to install by hand.
• Full dry system.
• Suits vertical & horizontal joints, and head of walls.

The FJ400 Intuspan is a versatile joint filler designed to maintain fire compartmentation in walls and floors where construction joints require a reliable movement seal and specific fire rating. It has been rigorously tested for linear joints ranging from 12 mm to 115 mm and offers exceptional physical movement capability - 60% compress-and-return functionality and ±30% cold-state movement (30% extension and 30% compression). Ideal for large gaps over 35 mm, it outperforms standard mastic joints in demanding applications, such as acoustic isolation, high-movement areas, and spaces subjected to regular expansion, contraction, or vibration. The FJ400 is particularly suited for earthquake-resilient structures and military buildings designed to endure high ground-movement shockwaves, making it an essential solution for projects where durability and reliability are critical.

What is Nullifire FJ400?

Nullifire FJ400 Intuspan is an intumescent joint filler designed to provide fire resistance in linear gaps and construction joints in fire-rated walls and floors.

How does FJ400 work?

FJ400 contains intumescent material that expands when exposed to high temperatures, effectively sealing gaps and preventing the spread of fire, smoke, and toxic gases.

What fire rating does FJ400 provide?

FJ400 can deliver up to 120 minutes of fire resistance, depending on the joint size and application.