{"product_id":"bostik-ultraset-sf","title":"Bostik Ultraset® SF Polyurethane Flooring Adhesive","description":"\u003cdiv role=\"main\"\u003e\n \u003cp\u003eFor direct-stick timber flooring installations where boards must remain flat and bonded to concrete slabs without the risk of adhesive re-emulsification from moisture, Bostik Ultraset SF is a solvent-free polyurethane adhesive. It meets the requirements of EN 14293:2006 for bonding parquet to subfloors and is formulated to retain its flexibility after a full cure, accommodating the natural movement of timber flooring systems.\u003c\/p\u003e\n\n \u003ch3\u003eWhat it does\u003c\/h3\u003e\n \u003cp\u003eBostik Ultraset SF provides a continuous elastomeric bond between timber flooring and concrete subfloors or acoustic underlays. Because it is a 100% polyurethane formulation with zero VOCs and no solvents, it does not shrink during curing and will not damage prefinished timber coatings. The adhesive has been tested to ASTM C794 for peel adhesion to Australian hardwood species, ensuring high bond strength across solid strip softwood, hardwood, engineered timber, and bamboo flooring. It is also suitable for use over radiant heating systems and behaves as a dampening layer to improve acoustic properties.\u003c\/p\u003e\n\n \u003ch3\u003eNumbers that matter\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003e600% elongation:\u003c\/strong\u003e High flexibility to absorb the expansion and contraction of timber boards without shearing the bond from the subfloor.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e1.4 N\/mm² shear strength:\u003c\/strong\u003e Tested timber-to-timber under BS EN 14293 to ensure a high-strength, structural bond.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e1.5 to 2.5 mm per 24 hours cure rate:\u003c\/strong\u003e Cures via atmospheric moisture, achieving a light-traffic walk-on time in 8 to 10 hours and a tack-free state in approximately 4 hours at 23°C and 50% relative humidity.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e80% minimum bond area:\u003c\/strong\u003e The mandatory contact coverage required between the subfloor and the timber to prevent hollow spots and installation failure.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e1.1 to 1.3 m² per litre coverage:\u003c\/strong\u003e Average application rate when using standard trowels, varying based on the substrate profile and the selected notch size.\u003c\/li\u003e\n \u003c\/ul\u003e\n\n \u003ch3\u003eWhere to use it\u003c\/h3\u003e\n \u003cp\u003eBostik Ultraset SF is suitable for adhering:\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003eParquet, solid strip softwood and hardwood, engineered timber, and bamboo flooring.\u003c\/li\u003e\n \u003cli\u003eAcoustic underlays to concrete subfloors.\u003c\/li\u003e\n \u003cli\u003eDirect stick flooring over concrete slabs, joists, battens, plywood, timber, and particleboard.\u003c\/li\u003e\n \u003c\/ul\u003e\n\n \u003ch3\u003eLimitations\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003eDo not apply over any acrylic primer or sealer.\u003c\/li\u003e\n \u003cli\u003eDo not apply to dense, burnished concrete surfaces without first abrading or sanding the concrete to establish a mechanical key.\u003c\/li\u003e\n \u003cli\u003eDo not apply directly to Bostik PrimeGrip; the adhesive will not bond to it. If PrimeGrip is used, it must be covered entirely with Bostik UL-200.\u003c\/li\u003e\n \u003cli\u003eDo not use in totally confined or air-free spaces, as the product requires atmospheric moisture to cure. Cure times will extend in low humidity (below 40%).\u003c\/li\u003e\n \u003cli\u003eDo not use as a waterproofing membrane. It is not designed to waterproof a subfloor.\u003c\/li\u003e\n \u003cli\u003eDo not install over wet, contaminated, or friable surfaces.\u003c\/li\u003e\n \u003cli\u003eDo not expose the uncured adhesive to water or alcohol-based cleaners.\u003c\/li\u003e\n \u003cli\u003eDo not sand the timber floor until the adhesive has cured for a minimum of 24 hours.\u003c\/li\u003e\n \u003cli\u003eFor bamboo flooring installations, two coats of Bostik Ultraseal Vapour Barrier are recommended due to the high moisture sensitivity of bamboo.\u003c\/li\u003e\n \u003c\/ul\u003e\n\n \u003ch3\u003eInstallation and subfloor preparation\u003c\/h3\u003e\n \u003cp\u003eConcrete subfloors must be flat to within 3mm over 3m. Any areas exceeding this tolerance must be levelled using Bostik UL-200 over Bostik PrimeGrip. Concrete slabs should be constructed in accordance with AS2870. For ground floor slabs and new concrete less than four months old, apply Bostik Ultraseal Vapour Barrier to a wet film thickness exceeding 300µm to prevent moisture migration. Concrete subfloors are dry enough for timber installation when the Water Vapour Transmission Rate (WVTR) is under 15g\/m²\/24 hours via the calcium chloride method.\u003c\/p\u003e\n \n \u003cp\u003eApply Bostik Ultraset SF using a single application with an appropriate trowel:\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003e3mm x 4mm V Notch (1.2 - 1.4 m²\/L):\u003c\/strong\u003e Solid and engineered timber \u0026lt;13mm thick, and parquet \u0026lt;19mm.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e4mm x 5mm V Notch (1.0 - 1.2 m²\/L):\u003c\/strong\u003e Engineered timber \u0026gt;13mm thick, and engineered bamboo \u0026lt;13mm.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e5mm x 8mm x 6mm Flat V Notch (Up to 1.2 m²\/L):\u003c\/strong\u003e Engineered timber \u0026lt;13mm and acoustic underlayments.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e3mm x 3mm x 3mm Square Notch (Up to 2.0 m²\/L):\u003c\/strong\u003e Finger block parquet.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e6mm x 6mm x 3mm Square V Notch (Up to 1.0 m²\/L):\u003c\/strong\u003e Engineered timber \u0026gt;13mm, solid wood or bamboo \u0026lt;13mm, and parquet \u0026lt;19mm.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e6mm x 6mm x 6mm Square Notch (Up to 0.9 m²\/L):\u003c\/strong\u003e Solid wood or solid bamboo \u0026lt;13mm, or plywood.\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003cp\u003eTo clean up wet adhesive, use mineral spirits, Shellite, paint thinners, or Bostik Handy Wipes immediately, taking care not to damage prefinished timber coatings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Bostik","offers":[{"title":"Default Title","offer_id":42291976372416,"sku":"ULTRASET\/SSG\/BOX","price":310.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0507\/3630\/0224\/files\/ultraset-sf-solvent-free-adhesive-timber-flooring-adheseal.png?v=1763709937","url":"https:\/\/adheseal.com.au\/products\/bostik-ultraset-sf","provider":"Adheseal","version":"1.0","type":"link"}