FS4 Fireshield AC is a high-performance, flexible acrylic intumescent sealant designed to provide an acoustic and fire-rated barrier in interior construction applications. In the event of a fire, the intumescent fire sealant swells to help form an inert barrier against the passage of smoke and flames.

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FS4 Fireshield combines flexible, non-shrinking performance with rapid drying and fire-resistant properties, making it suitable for sealing a variety of interior construction joints and penetrations. Its solvent-free formulation can be overpainted after approximately one hour.

High-performance acrylic intumescent sealant
Provides an acoustic and fire-rated barrier
Up to 4-hour fire rating, depending on joint design, sealant depth and substrates
Swells when exposed to fire to help create a barrier against smoke and flames
Permanently flexible to accommodate movement in joints
Non-shrinking formulation
Rapid drying
Can be overpainted within approximately 1 hour
Solvent-free and non-hazardous
Suitable for interior applications
Can help reduce the passage of sound through sealed joints

FS4 Fireshield AC is designed for sealing linear joints and suitable penetrations where both acoustic and fire performance are required. It can be used across a range of interior construction systems, including walls, floors, ceilings and partitioning.

Sealing interior linear joints in floors and ceilings
Sealing joints in dry lining systems
Sealing partition walls and plasterboard
Sealing joints around suspended ceilings
Sealing penetrations around steel pipes
Sealing penetrations around copper pipes passing through plasterboard
Creating acoustic and fire-rated barriers in construction applications
Suitable for interior applications requiring an intumescent fire sealant
Can be overpainted with fire-resistant paint after approximately 1 hour
Up to 4-hour fire resistance can be achieved depending on the joint design, sealant depth and substrates

BS EN1366 3:2009; EN1366-4; EN ISO 10140-2: 2010