Gyprock Fire Mastic is a permanently flexible, water based acrylic sealant for fire resistant caulking of penetrations and joints in plasterboard walls and ceilings.
Product Overview
Gyprock Fire Mastic is an off-white, low VOC, fire and acoustic sealant manufactured to stringent product specifications, and features in many Gyprock fire and acoustic rated systems. It is a one-part water based sealant with a working life of 30 minutes and a skin time of 15mins. It provides a neutral paintable surface once cured, and is intumescent, expanding when exposed to fire or extreme heat.
Typical Applications
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.
Extensively Tested
Fire Testing
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.
Mechanical Testing
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.
Key Features
Sealant
Off-white acrylic sealant
Fire-rated Properties
Assists in fire-rated caulking of penetrations and junctions
Acoustic Properties
High acoustic rating when used in a system
Technical Specifications
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.
| Appearance | Off White paste |
| Working Time | Skin time = 15mins, Working time = 30mins |
| Joint movement capability | +/- 20% |
| Intumescent | Yes |
| Specific gravity (H2O=1) | ~1.55 |
| Acoustic Rating Rw | Tested to Rw + Ctr 55 as a gap sealant in a wall system |
| Fire rating | 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 |
| Isocyanate free | Yes |
| VOC content (as specified by GBCA) | 17g/L as VOC content per material |
| Service temperature | -20 to 80oC |
| Hardness (Shore A) | ~35 |
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.
Installation Instructions
AS/NZS2589: Gypsum linings – Application and Finishing outlines the procedures for the installation and finishing of Gyprock Perforated Plasterboard in conjunction with additional details contained in Gyprock Technical Literature.
Performance Guaranteed
Licensed by Australian Made Campaign Limited to use the Australian Made Logo.
Gyprock plasterboard products are manufactured for life with all CSR products designed to achieve optimal performance when part of a CSR integrated system.
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