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Gyprock Fire Mastic is a permanently flexible, water based acrylic sealant for fire resistant caulking of penetrations and joints in plasterboard walls and ceilings
Gyprock Fire Mastic is designed to create a fire resistant seal around pipes, conduits, busways, cable trays and ducts which penetrate walls, floors and ceilings. It will bond to plasterboard, masonry, concrete, steel, and cable coverings.
*CSR Gyprock only support the use of Gyprock Fire Mastic sealant when used as part of specified Gyprock systems as noted in our literature.
Gyprock Fire Mastic has been tested for periods of up to four hours, in systems, in accordance with AS1530.4 and achieved the following fire resistance levels (FRL):
- Plasterboard systems up to FRL 120/120/120.
- Masonry systems up to FRL 240/240/240.
Tests to AS4072 have shown that Gyprock Fire Mastic has movement capabilities of ±20% after curing, which means that this product remains flexible and resists cracking.
Off-white acrylic sealant
Assists in fire-rated caulking of penetrations and junctions
High acoustic rating when used in a system
Gyprock Fire Mastic is available in a 600ml sausage and has a shelf life of 12 months from date of manufacture.
For product availability and to place an order, contact your nearest supplier.
For use in junctions and penetrations in CSR Gyprock wall systems rated up to 120/120/120. Refer to
Gyprock The Red Book for details
FireMastic is manufactured for CSR Gyprock in Australia to stringent product specifications.
Store unopened sausages below 30°C in a cool dry place away from direct sunlight. Opened sausages may skin and form a lump near the opening. Discard any lumps or skin and remaining product can be used.
Safety Data Sheets are available on the Gyprock web site. They are important documents in the construction industry and assist in the continuing focus on occupational health and safety on and off work sites.
Ensure substrate surfaces are clean, sound, dry and free of oil, grease and surface contaminants such as dust, loose particles, release agents, silicone and water repellents.
This is particularly important regarding highly porous surfaces such as aerated concrete or cut edges of plasterboard. In circumstances where it is difficult to ensure completely dust free surfaces applying by brush a 1:1 solution of Fire Mastic and water as a primer will assist to improve the integrity of the substrate. Areas adjacent to joints may be masked to provide a neat finish. Masking should be removed immediately after tooling
Apply Fire Mastic in ambient conditions between 5 and 35 degrees centigrade. Higher temperatures should be avoided to prevent the possibility of bubbling of the
sealant due to rapid moisture evaporation. Do not apply below 5 degrees centigrade.
Fill joint with trowel or caulking gun, then tool off with a spatula and clean off excess with a damp cloth.
Protect from water for at least 24 hours until a suitable skin has cured (will require significantly longer at temperatures below 15 degrees centigrade). Some shrinkage is normal during curing, and should be anticipated when measuring joints.
After applying Fire Mastic, clean all tools and metal surfaces with warm water while the sealant is still wet. Cured sealant will need to be removed mechanically.
Firemastic sealant is suitable for painting when fully cured. To avoid paint cracking issue, Firemastic should be cured for at least 24 hours, longer under adverse drying conditions (cooler, high humidity) before painting where possible. In standard conditions (25 °C or higher) Firemastic may be painted after 6 hours, however, care should be taken to ensure a flexible acrylic coating is used and that a firm skin has developed.
Gyprock makes available resources that provide comprehensive selection, design, installation and maintenance guidance.
Design considerations and installation instructions.
Gyprock plasterboard products are manufactured for life with all CSR products designed to achieve optimal performance when part of a CSR integrated system.
Exceeds the GBCA specification for Volatile Organic Compound content according to independent testing.
Find your nearest Gyprock plasterboard specialist outlets and other retailers that stock Gyprock products.