Meeting stringent fire and acoustic performance standards in critical building joints demands a sealant engineered for the task. Bostik Fireban One delivers up to 4 hours of fire resistance and certified acoustic performance, maintaining compartmentation where it matters most.
This product was formulated to provide a single, robust solution for movement joints that must also act as fire and acoustic barriers. It's a one-component, intumescent polyurethane designed to expand and seal voids under fire conditions, while also accommodating significant structural movement and dampening sound transmission. Its formulation ensures both long-term flexibility and resistance to common environmental stressors.
As a one-component sealant, Bostik Fireban One requires no mixing, simplifying application. It applies smoothly as a non-sag thixotropic paste, ideal for overhead and vertical joints. Apply between 5°C and 35°C. For optimal performance, always prime porous substrates with Bostik N49 Primer or non-porous concrete with Bostik Ultraseal. For metals and plastics, use Bostik N40 Primer. Tool the sealant to a concave shape immediately after application to ensure maximum contact and proper joint geometry, using a compatible backing rod. Uncured material and equipment can be cleaned immediately with Bostik Handy Wipe towels.
Bostik Fireban One typically serves as the primary sealant in fire-rated joint sealant systems. It’s applied after surface preparation and priming, defining the fire and acoustic barrier within the movement joint, as a critical component of the overall compartmentation strategy.
Bostik Fireban One is engineered for critical applications requiring certified fire and acoustic ratings. For general-purpose sealing needs that do not demand these specific performance criteria, or where limitations such as use in chlorinated water or glazing are present, other general-purpose sealants should be considered. For external weatherseals without fire rating, consider alternatives like Bostik Seal 'N' Flex FC. For acoustic joint sealing without fire rating, Everflex Fire Fill may be a more suitable option.
Bostik Fireban One is suitable for sealing joints in fire-rated and acoustic-rated construction. It is specified for insitu concrete, precast and tilt-up panels, brickwork, blockwork, rendered masonry, plasterboard, and fibre cement sheets.
Bostik Fireban One is fire-rated up to 4 hours, certified to AS 1530.4-2014 and AS 4072.1-2005. It also provides acoustic sealing performance, which is critical for compliant fire and sound-rated systems.
Bostik Fireban One is not recommended for trafficable joints wider than 10mm. While it handles joint movement up to 50% (± 25%), wider trafficable joints require a product specifically designed for higher mechanical loads.
Bostik Fireban One can be painted after a minimum of 7 days of cure time. A field test is recommended to confirm compatibility, as some solvent-based paints may affect the sealant's surface or cause discolouration.
| Application | Key benefit | Primary trades |
|---|---|---|
| Insitu concrete floors and walls, precast and tilt-up panels | Maintains fire integrity up to 4 hours (AS 1530.4-2014, AS 4072.1-2005) and accommodates 50% joint movement. | Commercial Builders, Fire Protection Specialists, Concrete Precasters |
| Brickwork, blockwork, and rendered masonry joints | Provides certified fire and acoustic sealing in masonry structures. Excellent durability resists weathering and fungal growth. | Bricklayers, Plasterers, Fire Protection Specialists |
| Fire-rated and acoustic-rated plasterboard and fibre cement sheet systems | Ensures system compliance for fire resistance and sound transmission in wall and ceiling assemblies. Paintable after full cure. | Carpenters, Plasterers, Interior Fit-out Contractors |
DANGER: Causes mild skin irritation. Toxic if inhaled. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause an allergic skin reaction. Suspected of causing cancer. May damage fertility or the unborn child. Toxic to aquatic life with long lasting effects.
Wear protective clothing, gloves, eye/face protection (e.g., safety glasses), and a suitable respirator. An air-fed mask may be required in situations of inadequate ventilation. Contaminated work clothing should not leave the workplace.
Use only outdoors or in a well-ventilated area. In case of inadequate ventilation, respiratory protection is required to avoid breathing dust, fume, gas, mist, vapours, or spray.
For emergency information, contact the Poisons Information Centre (phone 131 126) or the Emergency Response Service (phone 1800 033 111).
Store in a cool (5°C to 30°C), dry, well-ventilated area, away from direct sunlight, oxidising agents, and acids. Keep containers tightly closed. Shelf life is 12 months in the original unopened container. Empty foils may be disposed of via local landfill. Absorb spills with sand or earth, collect in a properly labelled metal container, and dispose of according to local regulations. Do not dispose of down drains or into waterways.
Proper surface preparation and priming are essential to ensure the documented performance of Bostik Fireban One.
Surface prep: Clean and dry all surfaces. Remove contaminants like laitance, oil, dust, grease, and old sealants. Vacuum clean dust and loose particles.
Primer: Optional. For maximum performance, especially in periodically immersed or submerged applications, use Bostik N49 Primer. For porous substrates not subject to immersion, priming is not required if the surface is clean, dry, and uncontaminated. Do not use methylated spirits or turps.
Surface prep: Clean and dry all surfaces. Remove contaminants like oil, grease, and any protective coatings.
Primer: Required. For non-porous or burnished concrete, use Bostik Ultraseal. For plastic and metallic non-porous substrates (such as UPVC, brass, copper, stainless steel), use Bostik N40 Primer with the two-cloth method.
| Property | Value |
|---|---|
| Fire Test Certification | AS 1530.4-2014, AS 4072.1-2005 |
| Acoustic Rating | Acoustic rated |
| Movement Capability | 50% (± 25%) |
| External Joint Sealant Standard | ASTM C.920 Type S, Grade NS, Class 25, use NT, G, A, M, & O |
| Resistance to Fungal Growth | AS1157-1972 |
| Viscosity | Non-sag, smooth thixotropic paste |
| Cure Method | Moisture curing |
| Chemical Resistance | Dilute acids, alkalis, some solvents, intermittent contact with petroleum and diesel |
| Application Temperature Range | 5 to 35°C |
| Service Temperature Range | -40 to 70°C |
| Tack Free Time | 6-12 hours |
| Cure Rate | 2mm/24 hours on porous substrates |
| Full Cure Time | 7 days on porous substrates |
| Specific Gravity | 1.45 g/ml |
| Shore A Hardness | 30 |
| Tensile Strength | > 1.3 N/mm² |
| Elongation at Break | > 900% |
| Maximum Joint Width | Up to 50mm |
| VOC Content | 64 g/litre |
| Shelf Life | 12 months in original unopened container |
Here are some common examples on where Bostik Fireban One Polyurethane Sealant used by our customers.
