POLYBRON 685

DESIGNATION	POLYBRON 685 Two-component non solvented polyurethane resin, hardening by mixing and reaction to polyol and isocyanates. Manual version.
APPLICATION	Indoor and outdoor rehabilitation and waterproofing.
LOCALIZATION	Waterproofing for circulated or non circulated areas. Lining of structures in contact with food stuff or liquids. Anti-corrosion of all metallic surfaces. Anti-abrasion coating. Ferrous substrates, in country, city , marine and industrial environments.
SUBSTRATES	Applications on various substrates :Wood, concrete, cement, steel, plastic...
PROPERTIES	POLYBRON 685has been specifically designed for manual use. Its application is therefore especially recommended especially on small surfaces (below 500 m²). Beyond 500 m², the machine version, POLYBRON 386, will be preferable. Thanks to the absence of solvent, the hardening of the POLYBRON resin has a low shrinkage effect. The adhesion is improved by using POLYBRON primers. Very high permeability to water and vapour transmission. Outstanding resistance to abrasion, corrosion and weathering. Excellent resistance to numerous chemical acid and basic agents. Good resistance to organic solvents, mineral oils, (a guide for chemical resistance is available, please contact us if required).
SUBSTRATE PREPARATION	The substrates have to be perfectly clean, dry and free from grease. They should be perfectly safe after cleaning. The concrete substrates should preferably be sandblasted or iron filled. In any case, they must be free from cement milk, perfectly dry and stabilised. The concrete pH must be stabilised to neutral.
APPLICATION	Mix the two components with full respect of the proportions : Polyol 75% and Isocyanate 25% (weight). A good trick for experienced users who will strictly follow these rules : Use measure recipients : two glasses of equal capacity that will be once and for all dedicated, one to the Polyol, the other one to the Isocyanate. Then apply the following process : Pour three volumes of base in a bucket Pour one volume of the hardener in this bucket Thoroughly mix to get an homogeneous solution, carefully avoiding air inclusion. Once the mixing is ready, the liquid obtained can immediately be applied on the substrate, with brush or roll. The effective time of use of POLYBRON 685 is about 20 minutes at 20°C. We consider that beyond 15 minutes, the viscosity becomes too high to allow an efficient use. Drying @ 20°C and Relative Humidity 65% Dust free : 1 hour Dry : 6 hours Overcoating interval : 4 and 72 hours Keep in mind that any rise of temperature will accelerate the hardening process. At 30°C, the effective time of use will be lower than 10 minutes. Only prepare the mixing necessary quantity. Do not apply if hygrometry is >85%. Minimum temperature for application : 5°C. The surface temperature must always be 3°C over the dew point temperature, according to temperature and humidity. Never dilute the products with any solvent. Never modify BASE/HARDENER proportions After polymerisation, the base can be sanded, then covered with an other coat of resin or finishing polyurethane paint (POLYBRON 705). CLEANING SOLVENT : Chlorinated solvent (trichlorethylene, dichloromethane) Methylethylketone, Acetone After polymerisation, do not use small equipment again.
EFFICIENCY	Average consumption : about 1,3 kg/m² for 1 mm thickness.
PRECAUTIONS FOR USE	Usual precautions for storage and using liquid chemicals (gloves, glasses, safety goggles) Carefully read the relevant safety data sheets. - Do not eat - Isocyanates can be harmful. If any contact with skin, rinse with plenty of water and soap. See a doctor in case of persisting irritation. - If any contact with eyes, immediately rinse with running water. - Do not throw in sewerage system
TECHNICAL DATAS	BASE : Polyol Viscous liquid at room temperature Boiling temperature : 250°C Density : 1,32 Flash Point : 268°C Colour : Grey or cream HARDENER : Isocyanates Brown viscous liquid at room temperature Decomposition temperature : > 250°C Density : 1.22 Flash Point : 199°C. Incompatible with water POLYMER : Dry extract 100% Elongation 180 kg/cm² Compressibility 5000 to 6000 N Adhesion on concrete > concrete cohesion Shore : 63 to 73 g/m²/24 h Permeability : 0.265 g/m²/24 h Adhesion on steel > 1000 N (Elcometer) Electrical isolation : 1500 V / 100 microns Cathode protection : 1500 mV / 60 days Fire resistance : Class M2 auto-extinguishable Very low shrinkage Overcoating after 2 hours at 20°C with one-component polyurethane.
SHELF LIFE	Shelter the closed packs in a dry, temperate and ventilated place. Avoid frost and temperatures > 30°C. Maximum shelf life : 6 months.
REGULATIONS	- Road and Maritime Transport : RTMD Class 6.1 Art.723/Groupe 61310 - Mixing of diphenyle methane diisocyanate - Product irritating for eyes. - Labelling complying with regulations for dangerous products according to European norms : R/20, R/36/37/38, R42/S/26/28/38/45.

Information and recommendations contained in this data sheet are the result of experience gained under controlled circumstances and today knowledge. Their accuracy and completeness under the actual conditions of any intended use are not guaranteed and must be determined by our approved applicators since application is beyond control. Disclaims and any liability in excess of what is stated therein for results obtained, injury, direct or indirect damages. Total or partial reproducing of this document can only be made with our express agreement.