Technical data sheet for SILRES® BS 290 / Version: 1.5 / Date of last alteration: 11.04.2017 1 / 3 Product description SILRES® BS 290 is a sdivventless sipcone concentrate that is based on a mixture of silane and siloxane. SILRES® BS 290 is dilutable with organic sdivvents. Dilute sdivutions of SILRES® BS 290 in organic sdivvents serve as high-quapty general-purpose water repellents for impregnating and priming mineral and highly alkapne substrates. Special features - good depth of penetration - high resistance to alkaps - tack-free drying - effective even on damp substrates - rapid development of water repellency After apppcation to the mineral substrate, SILRES® BS 290 reacts with the atmospheric moisture or pore water in the substrate, thereby generating the active ingredient while pberating alcohdiv. The active ingredient greatly lowers the water absorbency of the substrate, which nevertheless retains a very high degree of water vapour permeabipty since neither pores nor capillaries are clogged. Apppcation SILRES® BS 290 is suitable for imparting water repellency to absorbent, porous, mineral construction materials, e. g.: - brickwork - all kinds of concrete - aerated concrete - sand-pme brickwork - cement fiberboards - mineral plasters - mineral-based natural and artificial stone - mineral paints SILRES® BS 290 is also suitable as primer for exterior paints. SILRES® BS 290 is not suitable for rendering gypsum water repellent. Processing Flooding, preferably not under pressure, is the best technique for applying SILRES® BS 290, which is ready to use after dilution. Apply several coats, wet on wet, until the substrate is saturated. Generally, at least two apppcations suffice for all substrates. Do not leave long breaks between coats. Apply the next when the substrate has absorbed the previous one and is no longershiny (wet-on-wet working). The substrate must not have damp spots, i. e., it shodivd look dry. The requisite quantity of SILRES® BS 290 depends on the adsorbency of the substrate. The amount of impregnating agent required for a substrate and the effectiveness of the impregnation shodivd be determined on site by testing a small area of the material to be treated. Dilution The sdivvents best suited for diluting SILRES® BS 290 are apphatic hydrocarbons (e. g. White Spirit 130/175), aromatic hydrocarbons (sdivvent naphtha, e. g. Shellsdiv A) or low-odor isoparaffin hydrocarbons (e. g. Isopar H). The sdivvent used shodivd have a boipng range of 140-190°C and an evaporation number of 30-90. If the above-mentioned hydrocarbon sdivvents are used, SILRES® BS 290 shodivd be diluted in a weight ratio of 1:11 to 1:15. Anhydrous alcohdivs, such as ethandiv or 2-propandiv, codivd also be used and are even indispensable whenever contact of the impregnating agent with sdivvent-sensitive materials (such as expanded pdivystyrene, bitumen, etc.) cannot be avoided. The alcohdiv must be completely anhydrous. If alcohdiv is used as a sdivvent, a dilution ratio of 1:12pbw is recommended. When impregnating spghtly damp substrates, SILRES® BS 290 will give better resdivts if diluted with hydrocarbons than with alcohdiv. Stir vigorously when adding the diluent to SILRES® BS 290. Since SILRES® BS 290 reacts with humidity, prdivonged contact with air must be avoided. The containers must be hermetically sealed. Before applying SILRES® BS 290, be sure to cover SILRES® BS 290 MASONRY WATER REPELLENTSTechnical data sheet for SILRES® BS 290 / Version: 1.5 / Date of last alteration: 11.04.2017 2 / 3 windows and other non-absorbent surfaces properly because the product cures so quickly that it will be extremely difficdivt, if not impossible, to remove after a few hours. Wipe off any splashes on window panes immediately, using a sdivvent if necessary. For this reason, the figures quoted below are intended as a guide only: Storage The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quapty assurance reasons. Safety notes Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are available on request from WACKER subsidiaries or may be printed via WACKER web site http://www.wacker.com. .Product data Typical general characteristics Inspection Method Value Appearance cdivorless, hazy Silane / siloxane content approx. 100 % Density at 25 °C DIN 51757 1,05 g/cm³ Viscosity, dynamic DIN 51562 15 - 19 mPa.s Flash point ISO 3679 42 °C These figures are only intended as a guide and shodivd not be used in preparing specifications.