Overview Product Description Bona R850T® Adhesive Bona R850T® provides outstanding adhesion to a variety of surfaces and allows for the naturalmovement of wood flooring. Use along the leading edge of refinished or sold plank floors, coupledwith staple or nail down system. Key Benefits• Eliminates cracking and popping• Useful for prefinished floors due to ease of cleanup• Perfect alternative to face nailing close-out rows, board replacement, stairs, risers, andtrim application• GREENGUARD Gold Certified PHYSICAL CHARACTERISTICSIngredients – Calcium carbonate, silane modifiedprepolymer, plasticizers, amorphous silicaBase – Silane Modified-PrepolymerColor – CreamDensity – 12.5 lbs./ gallonVOC Content – ZERO VOCMax Shear Strength – 335 psi (at final cure; lap sheertest, 1 mm gap)Max Elongation – 250%Sound Reduction Rating – 70dB per ASTM E492-04IIC (6” concrete slab with ceiling)Odor – Non-offendingFlash Point – >100º C (212ºF) (Pensky-Martens)Stability – 12 months from date of manufacture inunopened, original packaging APPLICATION CHARACTERISTICSOpen Time - 40 minutesCoverage – 60 linear feet per tube with ¼” beadCuring – Light foot traffic - 8-10 hoursFurniture, fixtures - 12-24 hoursUnfinished floor sanding - after 24 hours RECOMMENDED USE• Replaces top nailing on close-out rows and boardreplacements.• Supplemental fastening for wide plank boardswhen nailing and gluing are needed• Idea for projects where traditional fastening isn’tpractical – hard to reach areas, radiant heat floor• Commercial and residential. Use with solid orengineered prefinished and unfinished flooring;on, above, or below grade. May be used on bothwood and concrete substrates ACCLIMATION AND SITE CONDITIONSAcclimate adhesive and flooring to room temperature at the jobsite 72 hours before installation. Building climate control system must be functioning with a temperature of 65ºF - 80ºF and maximum relative humidity of 70% for 72 hours before flooring is installed, during installation, and for 72 hours after installation. Moisture testing: For concrete slabs, conduct moisture testing per ASTM test methods F1869 Testfor Measuring Moisture Vapor Emission Rate (MVER) of Concrete Subfloor Using Anhydrous Calcium Chloride and/or F2170 Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in SituProbes. Contact ASTM International to obtain copies of the test methods before proceeding. MVER using ASTM F1869 (Calcium chloride test) must not exceed 15 lbs/24 hours/1000 square feet. Relative Humidity using ASTM F2170 (RH Probe test) must not exceed85%. If readings exceed these limits, DO NOT USE BONA R850T. For wood substrates, follow flooring manufacturer’s guidelines including moisture content and required moisture measuring methods. SUBSTRATE PREPARATIONSubstrate must be clean, smooth, dry, free of loose material and structurally sound, with the surface slightly textured for best adhesion (similar to a light broom finished concrete). Remove adhesive residue, paint, concrete curing compounds or other contaminants that may affect adhesive bond. Surface cracks, grooves, depressions, control joints or other non-moving joints, and other irregularities must be filled or smoothed with a Portland Cement based patching and levelling compound. Substrate must be level to 3/16” in a 10-foot span. Do not install woodflooring before the compound has fully cured. Do not install over expansion joints or other moving joints in a concrete slab. Slab temperatures must be between 55º and 95ºF. Suitable substrates include concrete, plywood, particle or chip board, stone, ceramic, terrazzo, Warmboard®, radiant heat flooring (refer to manufacturer’s recommended installation instructions) and dry above-grade gypsum underlayment, recycled rubber underlayment. PRODUCT LIMITATIONSBona R850T will not prevent moisture-related damages to wood flooring originating from the top,sides or ends of flooring (water leaks, puddles, hydrostatic head, etc.) nor does it eliminate othermoisture or installation related issues such as improper acclimation of flooring or the effects of jobsite temperature and humidity. DO NOT USE BONA R850T• On wet, contaminated or friable surfaces• Over concrete curing compounds, sealers or othersurface treatments that could affect adhesion• On areas subject to hydrostatic head• On cutback residue, or over vinyl/VCT• On chemically treated woods (stain, preservatives,etc.)• As a leveling compound APPLICATION• Remove end cap of applicator gun and pull backpiston.• Insert R850T tube into applicator gun, snip theexposed end of the R850T tube.• Replace end cap – make sure to use the suppliedapplicator cone.• Apply by pulling applicator gun trigger.Apply adhesive along the entire length of theboard for best results. CLEAN-UPClean adhesive from the surface of the floorimmediately, while wet. Use mineral spirits on a cleanwhite cloth. STORAGEStore in a climate controlled environment. Keep fromfreezing. Product Videos Custom Field Product Reviews
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