Description
Bostik Ultraset SF Pro is a ready-to-use, solvent-free polyurethane adhesive for fixing timber flooring, supplied here as a single 600ml sausage pack. It is an elastomeric, one-part formula made for fitting parquet, solid strip, engineered, bamboo and sheet timber flooring to flat concrete or timber subfloors, or over an existing floor.
About the formula
A one-part, moisture-curing polyurethane with no solvent and a zero VOC rating. There is no mixing, and it spreads easily. It stays flexible after full cure, so the bond can move with the timber, and it is suitable over radiant heating. Bostik also lists good acoustic properties, and the product is made in Australia. The technical data sheet notes testing to ASTM C794 for peel adhesion on a range of Australian hardwoods. It also notes that the product meets EN 14293:2006 for adhesives bonding parquet to a subfloor. Bostik quotes a Shore A hardness of about 52 and a timber-to-timber shear strength of 1.4 N/mm2 (2mm bond line, BS EN 14293).
Where to use it
Indoors: direct-stick installation of timber floors over flat concrete or timber subfloors, or over existing floors, in residential and commercial settings. It can also fix recommended acoustic underlays as an intermediate layer between the subfloor and the flooring.
Outdoors: not intended for exterior use.
Suitable flooring types include parquet, solid strip, engineered, bamboo and sheet timber systems.
How to use it
Surfaces must be clean, dry, sound and free of voids, curing compounds, loose material, oil and grease. The subfloor should be flat to within 3mm over a 3m straightedge. If it is out of tolerance, prime and level it first using Bostik's recommended primer and levelling compound, and follow their data sheets. Spread the adhesive evenly so the film is not patchy and has no pinholes. The data sheet calls for a wet film thickness above 300 microns. Lay the flooring in line with the timber manufacturer's installation instructions. Where a vapour barrier is needed over a new or green slab, Bostik's Ultraseal Vapour Barrier is the recommended option.
Important notes
The adhesive needs atmospheric moisture to cure. In low humidity (below 40%), check with Bostik technical services before you start. Do not use it as a waterproofing membrane. Do not install it over wet, contaminated or friable surfaces, and keep it away from water exposure. Allow timber to acclimatise and leave expansion gaps as the timber manufacturer or installation standard requires. Dense, burnished concrete may need abrading first. Cure and walk-on times depend on temperature, humidity and film thickness, so check the current data sheet for your job. A sausage gun is needed to dispense the 600ml foil pack, and it is not included.
Specifications
| Brand |
Bostik |
| Product |
Ultraset SF Pro Solvent Free Polyurethane Timber Flooring Adhesive |
| Pack |
1 x 600ml sausage |
| Base |
One-part, solvent-free, moisture-curing polyurethane (elastomeric) |
| VOC |
Zero VOC |
| Application |
Sausage gun, spread with a notched trowel |
| Shore A hardness |
Approx. 52 |
| Shear strength (timber to timber, 2mm) |
1.4 N/mm2 (BS EN 14293) |
| Standards |
Tested to ASTM C794; meets EN 14293:2006 |
| Use |
Interior timber flooring, including over radiant heating |
| Origin |
Made in Australia |
Safety
Bostik describes it as solvent-free and non-flammable. Wear chemical-resistant gloves and eye protection, work with good ventilation, and avoid skin contact and breathing vapour. Store in the original sealed container, under cover, dry and within the manufacturer's temperature range. Refer to the Safety Data Sheet (SDS) for full details.
