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Sikafloor®-21 PurCem®

Product Code : 4067070300104

Sikafloor®-21 PurCem®

Sikafloor®-21 PurCem® LP is a three-part, water dispersed, medium to high strength coloured, polyurethane modified, cement and aggregate screed with self smoothing properties. Advantage: It has an aesthetic, smooth textured aggregate surface providing medium slip resistance and is typically installed at 3 to 6 millimeters thickness. It has a similar coefficient of thermal expansion to concrete, allowing movement with the substrate through normal thermal cycling. It  will perform and retain its physical characteristics through a wide temperature range from -5 °C up to +65 °C. It has high mechanical resistance and it will behave plastically if subjected to impact, and it will deform but will not crack or debond. Furthermore, it has good chemical resistance, able to withstand a wide range of organic and inorganic acids, alkalis, amines, salts and solvents.

Sikafloor®-21 PurCem® LP has a shelf life of 6 to 12 months from the date of production. It is advised to store it in a cool and dry place away from direct sunlight frost and humidity.

Prior to application, the concrete substrate must be sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum pull off strength of 1.5 N/mm2. The substrate must be clean, dry and free of all contaminants such as oil, grease, coatings and surface treatments, etc. Sikafloor®-21 PurCem® can be applied onto recent concrete over 7 to 10 days old or onto old damp concrete (SSD) without having to prime first, as long as the substrate fulfils the above requirements. In addition, concrete substrates must be prepared mechanically using abrasive blast cleaning or other equipment to remove cement laitance and achieve an open textured surface. Weak concrete must be removed and surface defects such as blow holes and voids must be fully exposed. All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush and/or vacuum.

Per mixing instruction, pre-mix part A and B separately, make sure all pigment is uniformly distributed with a low speed electric stirrer. Start mixer and add part A and then B and blend for 30 seconds. Then, gradually add part C to the mixed resin parts over a period of 15 seconds. Allow part C to blend for further 2 minutes minimum, to ensure complete mixing and a uniform moist mix is obtained.

Proceed with placement of the material to facilitate the release of entrapped air from the mix and CO2 from the reaction. Do so in every batch mixed in a consistent manner in order to avoid colour differences due to increased temperatures in the reaction. Pour the mixed Sikafloor®-21 PurCem® LP onto the substrate and work with a toothed trowel or pin screed to the desired thickness, achieving a flat surface. A straight edge trowel can also be used to smooth out the marks of the tooth trowel or instead of it. Take care to spread newly placed materials across the transition of previously applied mixes before the surface begins to set.

For safety precautions, it is advised to use proper protective equipment when handling and using the product. It should not be disposed into the drainage system or nearby water sources and soil, properly dispose of this product according to local laws and regulations.