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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 and masonry surfaces.
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, metal deflection heads 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
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.
FireMastic is manufactured for CSR Gyprock in Australia to stringent product specifications.
Transportation and manual handling: Refer to the Gypsum Board Manufacturers of Australia (GBMA) website for recommended OH&S practices.
Storage: 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 important documents in the construction industry and assist in the continuing focus on occupational health and safety on and off sites.
* for 10mm x 10mm joint in concrete. For full details on FireSeal suitability, fire and acoustic performance, mandatory system requirements or applicable system warranties for all products or building systems within CSR, please refer to the relevant design guides published by Hebel®, Gyprock®, Bradford™ or Cemintel™.
Make sure substrate application area is clean, sound, dry and free of oil, grease and other contaminants like dust, loose particles, release agents, silicone, and water repellents. This is critical for porous substrates like 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 thin consistency of Firemastic and water as a primer will assist to improve the integrity of the substrate. Areas adjacent to joints may be masked to provide a clean finish. Masking should be removed immediately after application.
Apply Firemastic in ambient conditions (5°C - 35°C). Higher temperatures should be avoided to prevent the possibility of bubbling of the sealant due to quick water loss and do not apply < 5 °C. Trowel or caulking gun can be used for filling thew joint, then tool off with a spatula and clean off excess with a damp cloth. Protect the applied Firemastic from water for minimum 24 hours until a suitable skin has cured (will require significantly longer drying time at lower temperatures <15 °C). Some shrinkage is normal during curing and drying of the Firemastic and should be anticipated when measuring joints.
Time to cure is dependent on ambient weather conditions and depth of joint. Allow longer curing times in cold or damp ambient conditions. Protect from water contact until at least a thick-skinned surface has formed.
Firemastic is not recommended for use in external applications where 2 non-porous substrates need to be sealed. In these situations, Firemastic will be very slow curing and any water from rain, dew, fog etc may result in wash-out of Firemastic from the joint.
AS/NZS2589: Gypsum linings – Application and Finishing outlines the procedures for jointing and finishing of Gyprock plasterboard in conjunction with additional details contained in Gyprock Technical Literature.
After applying Firemastic clean all tools and metal surfaces with warm water while the sealant is not skinned. It is difficult to remove cured sealant, it may 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 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.