A special polymer-modified binder for use in rapid-set cement screeds allowing early flooring installation, based on DIN 18 560. Low-chromate to Regulation 1907/2006/EC, Annex XVII.

Features and benefits:

Ready for tiling after only approximately three days.
For fast-track or tightly scheduled screed laying.
Suitable for floor heating systems.
Good workability.
Pumpable.
Tested to CT-C60-F7 DIN EN 13813.
Floor heating system: Suitable (maximum flow temperature: +55°C).

Mixing ratio:

1:4: 25 kg Sopro Rapidur® B5 : 100 kg 0–8 mm screed sand to DIN EN 12 620 (15 shovelfuls) : 7.5–8.5 L water (depending on sand moisture and mortar consistency). w/c ratio 0.30–0.34.
1:5: 25 kg Sopro Rapidur® B5 : 125 kg 0–8 mm screed sand to DIN EN 12 620 (20 shovelfuls) : 9.0–10.0 L water (depending on sand moisture and mortar consistency). w/c ratio 0.36–0.40.

Particle distribution (grading curve) for aggregate (screed sand) shall fall within A8/B8 range under DIN 1045 Part 2, Annex L, Diagram L.1, and shall exhibit an adequate, though not overly high proportion of fine sand; percentage passing a 0.25 mm sieve: approx. 7–10 %.

Coverage:

Mixing ratio 1:4: Approximately 4.0 kg/m² per cm thickness.
Mixing ratio 1:5: Approximately 3.5 kg/m² per cm thickness.

Strength class:

- Mixing ratio 1:4:

CT-C20-F4 after one day.
CT-C35-F5 after three days.
CT-C45-F5 after five days.
CT-C60-F7 after 28 days.

- Mixing ratio 1:5:

CT-C16-F3 after one day.
CT-C25-F4 after three days.
CT-C30-F4 after five days.
CT-C45-F7 after 28 days.

EPD_Sopro Rapidur® B5 Rapid Drying Screed Binder | SMET | 25.09.27