Sikafloor® BC 921

CE marking and declaration of performance based on EN 13813:2002 Screed material and floor screeds — Screed material — Properties and requirements — Synthetic resin screed material

Under the specified storage conditions the material has a shelf life of 12 months. For maximum shelf life under these conditions, see „Best before“ label.

Store in original drums under dry conditions and a temperature between 15-25°C. Do not expose to direct sunlight and prevent the temperature from falling below the abovementioned range.

100 : 55

not restricted, but no condensation of water on the surface

As self-smoothing body coat with smooth finish: 2,4 kg/m²

As self-smoothing body coat with antislip finish before broadcasting: 1,5 kg/m²

As topcoat with antislip finish: approx. 0,6 – 0,8 kg/m²

Sikafloor® BC 921 must be applied to primed or scratch primed substrate. The substrate must be load bearing, free of loose and brittle particles as well as substances, which impair adhesion such as oil, grease, rubber skid marks, paint or other contaminants. Pre-treatment is only necessary when the re-coating interval of the primer has been exceeded. If necessary, the primer must be renewed. After surface preparation the tensile strength of the substrate should exceed 1.5 N/mm² (check with an approved pull-off tester i.e. "Herion" at a load rate of 100 N/s). the residual moisture content of the substrate must not exceed 4% (check with e.g. CM device). The temperature of the substrate must be at least 3K above the current dew point temperature. A dampproof course must have been properly installed and intact. In addition to this, the respective guidelines for the application of reactive resins on substrates have to be followed.

Sikafloor® BC 921 is supplied in working packs which are pre-packaged in the exact ratio. Before mixing, precondition both A and B components to a temperature of approximately 15 to 25°C. Pre-mix part A. Pour the entire contents of part B into the container of part A. DO NOT MIX BY HAND. Mix with a double paddle mixer at high speed (ca. 600 rpm) for 90 seconds. Use always the same mixing time and mixing speed. Keep the mixer blades submerged in the coating to avoid introducing air bubbles. DO NOT WORK OUT OF THE ORIGINAL CONTAINER. 

After mixing pour the whole content of the bucket immediately on the surface. Sikafloor® BC 921 is applied to the prepared substrate, using a notched trowel or scraper. The teeth size should be selected according to the thickness of layer required. Do not exceed the max. recommend coverage rate. To remove air bubbles, spike roll directly after application.

The curing time of the material is influenced by the ambi-ent, material and substrate temperatures. At low temperatures, the chemical reactions are slowed down; this lengthens the pot life, open time and curing times. High temperatures speed up the chemical reactions thus the time frames mentioned above are shortened accordingly. To fully cure, the material, substrate and application temperature should not fall below the minimum. After application, the material should be protected from direct contact with water for approx. 24h (at 20°C). Apart from these limitations, the respective guidelines for this use of reactive resins in the concrete trade must be observed.

Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened material can only be removed mechanically.