Gyprock Fire Mastic is an off-white, low VOC, fire and acoustic acrylic grade sealant manufactured to stringent product specifications. It has a working life of 30 minutes and a skin time of 15mins. It provides a neutral paintable surface once cured.
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.
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.
Physical & Chemical Properties
||Off White paste
||Skin time = 15mins, Working time = 30mins
|Joint movement capability
|Elongation at break
||<0.4MPa at 100% elongation, fully cured. 0.8MPa max modulus.
||750,000 – 950,000cP
|Specific gravity (H20=1)
||1.50 – 1.60
|Acoustic rating Rw
||Tested to Rw + Ctr 55 as a gap sealant in a wall system.
||Up to FRL -/240/240 FRL when tested as a control joint to AS1530.4 supplemented by AS4072.1 and BS476: part 20.
|VOC content (as specified by GBCA)
||-20 to 80oC
|Hardness (Shore A)
||23 – 35
* 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™.
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.
Health and Safety
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.
Installing to Standards
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.
Gyprock makes available resources that provide comprehensive selection, design, installation and maintenance guidance.