Sikalastic 621 TC
SIKA
Sika is a global leader in specialty chemicals for the construction and industrial sectors. The company develops and supplies innovative products and systems for bonding, sealing, damping, reinforcing, and protecting structures. With a strong focus on sustainability and performance, Sika serves a wide range of applications including concrete production, waterproofing, roofing, flooring, and structural strengthening.
Read moreHighly durable, UV-stable, versatile and easily applied liquid polyurethane for use with the Sika-Trocal® Liquid Detailing System. Sikalastic®-621 TC is a cold-applied, one-component, seamless, highly elastic and UV-stable moisture-triggered polyurethane Top Coat (TC) designed to provide easy application and a durable solution as part of the SikaRoof ® MTC systems, as well as for detailing on single ply membranes. | |||||||||||||||||||||||||||
Usage
Advantages
Packaging5 l (7.2 kg (15.9 lb) approx.) metal pail 15 l (21.6 kg (47.6 lb) approx.) metal pail ColourSlate grey (RAL 7015), shale grey (RAL 8500), traffic white (RAL 9016), other colours available upon request | |||||||||||||||||||||||||||
Typical Product Data
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ApplicationAmbient Air Temperature +5 °C (+41 °F) min. / +35 °C (+95 °F) max. Relative Air Humidity 5 % r.h. min. / 85 % r.h. max. Substrate Temperature +5 °C (+41 °F) min. / +60 °C (+140 °F) max. ≥3 °C (37 °F) above dew point Substrate Moisture Content ≤4 % pbw moisture content. Test method: Sika®-Tramex meter No rising moisture according to ASTM (Polyethylene-sheet). Substrate Pre-Treatment Please refer to System Data Sheets of SikaRoof® MTC Systems Pot Life Sikalastic®-621 TC is designed for fast curing. High temperatures combined with high air humidity will increase the curing process. Thus, material in opened containers should be applied immediately. In opened containers, the material will form a film after 1–2 hours approx. (+20 °C (+68 °F) / 50 % r.h.). Waiting Time / Overcoating
*After four days the surface must be cleaned and primed with Sika® Reactivation Primer before continuing. Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity. Applied Product Ready for Use
* Be aware that impact of heavy rain or rain showers can physically damage the still liquid membrane. Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity. SUBSTRATE PREPARATION The surface must be sound, of sufficient strength, clean, dry and free of dirt, oil, grease and other contamination. Depending on the material the substrate must be primed or mechanically cleaned. Grinding may be necessary to level the surface. Suitable substrates are such as: concrete, bituminous felts and coatings, metal, brickwork, asbestos cement, ceramic tiles, wooden substrates. For detailed information regarding substrate preparation and primer chart please refer to Method Statement No. 850 94 01. MIXING Mixing is not required, however if the product is settled or separated on opening, stir Sikalastic®-621 TC gently but thoroughly in order to achieve a uniform colour. Stirring gently will minimise air entrainment. APPLICATION Prior the application of Sikalastic®-621 TC the priming coat if used must have cured tack-free. For the Waiting Time / Overcoating please refer to the PDS of the appropriate primer. Damageable areas (handrails etc.) have to be protected with tape or plastic wrapping. Please note, always begin with details prior to the installation of the horizontal surface.
CLEANING OF TOOLS Clean all tools and application equipment with Thinner S immediately after use. Hardened and/or cured material can only be removed mechanically. |