SikaScreed®-20 EBB

Structural bonding products for use bonding of mortars or concrete according to EN 1504-4, declaration of performance 41536303 and provided with CE marking.

Epoxy resin and special fillers

24 months from date of production

Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.

~1.4 kg/litre (+23°C)

> 1.5 N/mm² or a failure in the substrate. Adhesion will generally be dependent on surface preparation.

~ 1,0 mm max.

+10°C min. / +30°C max.

Beware of condensation.
The substrate and uncured product must be at least 3 °C above dew point to reduce the risk of condensation.

+10°C min. / +30°C max.

Substrate must be dry or matt damp (no standing water).

The pot-life begins when the resin and hardener are mixed. It is shorter at high temperatures and longer at low temperatures. The greater the quantity mixed, the shorter the pot-life. To obtain longer workability at high temperatures, the mixed SikaScreed®-20 EBB may be divided into smaller quantities. Another method is to cool down parts A+B before mixing them (not below +5°C).

Maximum waiting time for wet-in-wet application on SikaScreed®-20 EBB

If the maximum waiting time is exceeded then product should be removed before any further SikaScreed®-20 EBB applications and the substrate prepared appropriately.

For substrate roughness up to 1,0 mm and normal absorbency ~ 0,6 - 1,0 kg/m².
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.For higher substrate roughness and/or stronger absorbency the consumption must be calculated using  preliminary site trials.

Part A : part B = 2 : 1 by weight or volume

Prior to mixing all parts, mix part A (resin) using a low speed single paddle electric stirrer (300 - 400 rpm) until a uniform colour has been achieved. Add part B (hardener) to part A and mix part A + B continuously for 3,0 minutes until a uniformly coloured mix has been achieved. To ensure thorough mixing pour materials into a clean container and mix again for at least 1,0 minute to achieve a smooth consistent mix. Over mixing must be avoided to minimise air entrainment. During the final mixing stage, scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete mixing. Mix full units only. Mixing time for A+B = 4,0 minutes.

Prior to application, confirm substrate moisture content, relative air humidity and dew point.

Levelling

Avoid excess thicknesses of the SikaScreed®-20 EBB in local areas by prefilling as required, any surface voids with the SikaScreed HardTop mortar system.

Bonding bridge

Pour mixed SikaScreed®-20 EBB onto prepared substrate and apply evenly to the required thickness using a suitable stiff bristle brush or broom and work material well into the substrate. Alternatively for dry substrates, apply by roller or spray application. Ensure all areas of the substrate are fully covered. Apply SikaScreed® floor screeding systems on top of SikaScreed®-20 EBB ‘wet’ on ‘wet’.

When applying SikaScreed® floor screeding systems on top of SikaScreed®-20 EBB bonding bridge. As a guide it is recommended to keep application area to a maximum of 4 m² in addition to recommended waiting / overcoating times.

Clean all tools and application equipment with Sika® Colma Cleaner immediately after use. Hardened / cured material can only be removed mechanically .