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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 171 Economical, penetrating hydrophobic silane-siloxane, clear treatment for masonry and concrete Uses To protect atmospherically exposed reinforced concrete structures from attack by chloride ions and water intrusion. Nitocote SN502 is also suitable to protect other cementitious substrates and masonry. Nitocote SN502 is suitable for use on all types of structures, including those in coastal environments. It is equally suitable for new and existing structures. Advantages „ Reduces water and chloride intrusion „ Penetrates into porous substrates „ Non-staining „ Suitable for applications where windy conditions or high temperatures are likely „ Increases freeze thaw resistance „ Minimises efflorescence „ Chemically resistant to ice melting compounds, fuels, oils and atmospheric contaminants „ Allows water vapour to escape from the structure Description Nitocote SN502 is a single-component penetrating silanesiloxane system which penetrates into porous substrates and then reacts to produce a bonded hydrophobic lining to the pores. It significantly reduces the absorption of water and water borne salts, whilst allowing the passage of water vapour gas out from the substrate. Nitocote SN502 does not discolour the substrate and has excellent resistance to weathering. Technical support Parchem offers a comprehensive range of high performance, high quality repair, maintenance and construction products. In addition, Parchem offers a technical support service to specifiers, end-users and contractors, as well as on-site technical assistance. Design criteria Nitocote SN502 should be applied in 2 coats. To achieve the correct penetration and protection, Nitocote SN502 must be applied on the substrate at the coverage rates recommended. Properties Reduction in chloride ion penetration to NCHRP 244 Standard: 92% C.T.I. method: 98% Reduction in water absorption to NCHRP 244 85% Standard: C.T.I. method: 94% Specification clauses Silane-siloxane penetrating treatment The penetrating treatment shall be a silane-siloxane system with a reduction in chloride ion penetration not less than 92% and a reduction in water absorption of not less than 85%. Application instructions Preparation All surfaces should be dry and free from contamination such as oil, grease, loose particles, decayed matter, moss, algal growth, laitance and all traces of mould release oils and curing compounds. This is best achieved by lightly gritblasting the surface. Where moss, algae or similar growths have occurred, treatment with a propriety biocide should be carried out after the grit-blasting process. Application In order to obtain the penetrating properties of Nitocote SN502, it is important that the correct rates of application and overcoating times are observed. Number of coats: 2 flood coats Theoretical application rate per coat: 0.2 litres / m² Theoretical wet thickness per coat: N/A Overcoating time: 2 hours @ 20°C Nitocote SN502 should be applied in two flood coats until the recommended total application rate of 0.4 litres/m2 has been achieved. This is best accomplished by using portable spray equipment of the knapsack-type. If in doubt about the condition of the substrate, consult with your local Parchem sales office. Nitocote SN502 should be allowed to dry for a minimum of 2 hours (at 20°C) before continuing. Cleaning Nitocote SN502 should be removed from tools and equipment using Solvent 10 immediately after use. Limitations Nitocote SN502 should not be contaminated with water. The application of Nitocote SN502 should not commence if the temperature of the substrate is below 2°C. Fosroc® Nitocote SN502 December 2009


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