Sikafloor® BC 375 NAS

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 18 months. For maximum shelf life under these conditions, see “Best before” label.

Store in original drums, under dry conditions and a temperature ranging from 15 - 25°C. Do not expose to direct sunlight and keep the temperature within the abovementioned range.

100 : 22

Approx. 2,0 – 2,5 kg/m²

The consumption may not be below or over the above value to ensure the conductivity. If necessary, the substrate must be pre-levelled.

Sikafloor® BC 375 NAS must be applied to substrates primed with the conductive primer Sikafloor ® P 687´W AS. 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 conductive layer has been exceeded. If necessary, the conductive layer 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 damp proof has to be installed and must be intact.

Sikafloor® BC 375 NAS is supplied in working packs, which are pre-packaged in the exact ratio. The part A is the same as Sikafloor® BC 375 N. The part B contains the conductive fibres. Therefore, you have to use Sikafloor® BC 375 N part A and Sikafloor® BC 375 NAS part B. Pay attention to use Sikafloor® BC 375 NAS part B. Before mixing, precondition both A and B components to a temperature of approximately 15 to 25°C. Mix first the part B separately in order to ensure the homogeneity of the conductive fibers. Pour the entire contents of part B into the container of part A. It is important to ensure that the component B completely runs out with the conductive fibers. If necessary, part B must be scratched out with the last conductive fibers.

DO NOT MIX BY HAND. Mix with a mechanical drill and paddle at a very low speed (ca. 300 rpm) for at least 3 minutes. Scrape the sides and the bottom of the container several times to ensure complete mixing. Keep the mixer blades submerged in the coating to avoid introducing air bubbles. DO NOT WORK OUT OF THE ORIGINAL CONTAINER. 

After proper mixing to a homogeneous consistency pour the mixed parts A and B into a fresh container and mix for another minute. After mixing, Sikafloor® BC 375 NAS is applied to the substrate coated with the conductive primer Sikafloor® P 687 W AS, using a notched trowel or scraper. The tooth size should be selected according to the required layer thickness (take care not to go below min. recommend coverage rate or to exceed max. recommend coverage rate, this has a direct influence on the anti-static values). To remove air bubbles, spike roll 5-10min. after application. The curing time of the material is influenced by the ambient, 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, the substrate and the 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). Within this period, contact with water can cause a surface bloom and/or surface tackiness, both of which must be removed. Carbamate of Sikafloor® P 687 W AS has an effect on the conductivity of the coating and has to be removed.

After mixing, Sikafloor® BC 375 NAS is applied to the substrate coated with a primer, using a notched trowel or scraper. The tooth size should be selected according to the required layer thickness (take care not to go below min. recommend coverage rate or to exceed max. recommend coverage rate). To remove air bubbles, spike roll 5-10min. after application.

The curing time of the material is influenced by the ambient, 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, the substrate and the 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). Within this period, contact with water can cause a surface bloom and/or surface tackiness, both of which must be removed.

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