Sikafloor® BC 920

GB/T 22374-2018

High Performance Polyurethane

Store out of direct sunlight, clear of the ground on pallets pro-tected from rainfall.

Mixture: 1.5~1.6 kg/L

All Density values at +20°C.

≤ 60g/L

~70 (1 Day)

Higher concentration of mineral acids may cause matting of the surface and color changes.

Part A : Part B: Part C: Part D = 3.5 : 5.65 : 4 : 0.5 (by weight)

+10°C min. / +25°C max.

+10°C min. / +30°C max.

80% r.h. max.

Beware of condensation!
The substrate and uncured floor must be at least 3°C above dew point to reduce the risk of condensation or blooming on the floor finish.

+10°C min. / +30°C max.

≤ 8% pbw moisture content.
Test method: Sika®-Tramex meter or CM - measurement.
No rising moisture according to ASTM (Polyethylene-sheet).

Before applying Sikafloor® BC 920 on Sikafloor® P 920 allow:

Note:At low temperature the curing need longer time.

Note:These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and
wastage etc.

Sikafloor® BC 920 must be mechanically mixed using an electric power stirrer (300 - 400 rpm) or other suitable equipment.

Before mixing we should confirm the Temperature Requirements again:
▪ Substrate temperatures: 10°C – 30°C
▪ Material temperatures: 10°C – 25°C
Very low or very hot temperatures will make application more difficult and careful consideration should be given to storage of materials. In the cold weather conditions, precondition materials by keeping it in a heated room. In hot weather conditions, some form of airconditioned storage is required. Preconditioned materials at 18-25°C will reduce the possibilities of flash/slow setting and other defects

Mixing:

Sikafloor® BC 920 is supplied in four components; Part A, B, C & D with Part D being color component. The typical mixing steps are as follows:
1.Mix Part A with high speed electric drill for 1 to 2 minutes until material becomes fully homogeneous. Ensure no material is settled at the bottom of the pail.
2. Empty Part B in a separate clean mixing bucket. Whilst mixing with high speed electric drill Add mixed Part A and Part D.
3. Mix for 1 minute making sure to reach the bottom and sides of the can. Continue mixing for 1 minute to produce a fully blended, uniform material without color streaks.
4. Gradually Add Part C whilst mixing continues; Mix until the filler is uniformly dispersed, and the mix is uniform, typically 1½ - 2 minutes.
5. It is important to maintain constant mixing times throughout to ensure consistent color and to avoid introducing excessive air into the system.

Scratch Primer:
Sikafloor® BC 920 shall be applied to a cured scratch coat of Sikafloor P 920 of 0.8mm nominal thickness at a consumption rate of 1.2 – 1.5 kg/m² .
The scratch coat is applied to the prepared substrate using a steel trowel, pin rake trowel or squeegee. The scratch coat shall be allowed to dry completely to achieve a tack free surface before overcoating with Sikafloor® BC 920.
Before progressing further, ensure that substrate is fully sealed with scratch coat primer and if required apply another coat of scratch primer to ensure complete sealing of substrate.

Sealed substrate is very important to ensure the performance of Sikalfoor XTC as a system Please take note of the overcoating times for scratch coat before applying the Bodycoat.

Bodycoat:
Spread the mixed material over the dry scratch coat at a consumption of 1.5 to 3.0 kg/m² using pin rake trowel or steel trowel. The pins of the pin rake adjusted to appropriate depth. Use steel trowel for edge work. Use a spiked roller to produce smooth even finish. The whole floor should spike rollered twice. On the first pass the spike roller should be pushed right through the material to substrate to assist the flow, remove pin rake marks and to flatten the floor. Subsequent passes with the roller held lightly just upon the surface to bring the resin up to the surface and improve aesthetics.

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

To maintain the appearance of the floor after application, Sikafloor® BC 920 must have all spillages removed immediately and must be regularly cleaned using rotary brush, mechanical scrubbers, scrubber dryer, high pressure washer, wash and vacuum techniques etc. using suitable detergents and waxes.