FS23A Intumescent Sealant 2017-05-18T21:47:21+00:00

FS23A Acoustic Intumescent Sealant

FS23A Acoustic Intumescent Sealant is suitable for sealing joints and service penetrations in fire walls, partitions, fire rated door frames and glazing systems. Tested in accordance with BS 476:Parts 20 & 22:1987 and BS EN 1366-4, FS23A Acoustic Intumescent Sealant provides up to 4 hours fire protection in joints of up to 30mm wide. In addition to the fire rating the sealant may be used to seal joints in party walls to provide an acoustic seal.

Fire Rating

Please refer to technical data sheet.


FS23A Acoustic Intumescent Sealant  provides a Weighted Sound Reduction Index (Rw) of up to 57dB. Please consult our sales office with details of:

• Type of construction
• Required acoustic rating
• Size of joint

Airtight & Smoke Seal

FS23A Acoustic Intumescent Sealant will provide an airtight and cold smoke seal.


FS23A Acoustic Intumescent Sealant is a high specification, one part water based acrylic sealant, extruded from a cartridge loaded into a standard sealant gun. The depth of the joint will depend on the gap to be filled and the fire rating required (see fire rating).

All surfaces must be thoroughly clean and free of bond breaking contaminants prior to application of the sealant. No priming is required for most construction substrates, however, it is recommended that a small area be tested on substrates.

The sealant should not be applied if the ambient temperature is below 5ºC as adhesion will be impaired. The sealant is fast curing approximately 15 minute tack free time. When fully cured, the sealant is overpaintable. Under fire conditions the sealant forms a fire resistant ash.

Sizes: FS23A Acoustic Intumescent Sealant is currently available in 310ml cartridges.

Colours: The sealant is available in white and grey.

Specification: Install FS23A Acoustic Intumescent Sealant to provide up to 4 hours fire protection in all joints up to 30mm in all firewalls. Installation to be fully in accordance with manufacturer’s instructions.