Nullifire FS70: Fire Rated Silicone Sealant

October 20, 2026

Linear joints in compartment walls and floors need an appropriate firestopping solution to help maintain the intended fire performance of a building. Nullifire FS703 is a fire rated silicone sealant developed for suitable joint-sealing applications.


What is Nullifire FS703?

Nullifire FS703 is a low-modulus, neutral-cure silicone sealant. It is designed for use in specified linear gaps where a flexible fire resistant seal is required.


Its silicone formulation makes it a different option from acrylic firestopping sealants. The correct choice depends on the joint, the substrate, movement requirement and the tested installation details.


What should contractors consider?

Before using FS703, check the manufacturer's current technical data to confirm the permitted joint dimensions, substrates, installation depth and required fire performance.


Selecting a product based on its name alone is not enough. The complete installation must match an appropriate tested system.


Blazeout supplies passive fire protection products and firestopping materials to contractors, installers and construction professionals.


Our aim is to simplify procurement by bringing together a wide range o products through one supplier.

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