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32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Technical Data Sheet 165 Clear protective coating system for exposed concrete and masonry Uses A protective and weather-resistant system designed to protect new and existing concrete and masonry structures from attack by water, chlorides, sulphates, carbon dioxide and other acid gases. It can be used on a wide variety of structures and buildings, including high-rise flats, car parks, commercial and industrial buildings, subways, underpasses and bridges. Advantages „ Highly resistant to weathering „ Excellent barrier to chloride ingress „ Breathability allows water vapour to escape from structure „ Excellent barrier to carbon dioxide and other atmospheric acid gases Description The Dekguard Clear protective coating system comprises a single component, penetrating oligomeric silane-siloxane primer and a single component clear coating, both ready for immediate site use. The primer (Dekguard Primer) is supplied as a clear liquid and is based on a silane-siloxane dissolved in a penetrating organic carrier. The primer is reactive and capable of producing a chemically-bound hydrophobic pore lining, thus inhibiting the passage of water and water-borne contaminants. Dekguard Clear is a solvent based clear methacrylate coating, which will provide resistance to aggressive corrosion elements, weathering and rain. A major feature of the system is its ability to allow water vapour to escape from the structure. The Dekguard Clear coating system provides a satin finish. Its application may tend to slightly darken (wet) the finished appearance of the substrate. Technical Support Parchem offers a comprehensive range of high performance, high quality repair, maintenance and construction products. In addition, Parchem offers a technical support package to specifiers, end-users and contractors, as well as on-site technical assistance. Design Criteria The coating should be applied to achieve a uniform wet film thickness of not less than 140 microns. This equates to a dry film thickness (d.f.t.) of 20 microns. Subsequent coats must be applied at the same rate. Properties The values for Dekguard Clear shown below were determined using a 100 micron d.f.t., unless otherwise stated. Solids content by volume: 15% Carbon dioxide diffusion resistance Equivalent thickness of air (Taywood method) - Initial: 3.8 m per 20 micron d.f.t. Equivalent thickness of 30 MPa concrete cover (Taywood method): 9.3 mm per 20 micron d.f.t. Water vapour diffusion resistance (Taywood method): Sd 0.07 m @ 172 micron d.f.t. Reduction in chloride ion penetration (Aston Page method): >90% Fire testing (BS 476, Pt 7 : 1987) Spread of flame: Class 1 Fire testing (BS 476, Pt 6 : 1989) Propagation index I: 1.0 Freeze/thaw salt scalingASTM C672 (50 cycles): Unaffected Reduction in water absorption ASTM C642: 84% Specification Clauses Clear methacrylate protective/weather resistant surface coating The protective coating shall comprise a penetrating oligomeric siloxane primer and Dekguard Clear, a single component methacrylate coating. The total dry film thickness of the system shall be not less than 20 microns and shall give a reduction in chloride ion penetration not less than 90%. Fosroc® Dekguard Clear December 2009


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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