SikaScreed®-20 EBB

• Environmental Product Declaration (EPD) in accordance with EN 15804. EPD independently verified by Institut für Bauen und Umwelt e.V. (IBU)

Epoxy resin and special fillers

24 months from date of production

The 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 the packaging.

Refer to the current Safety Data Sheet for information on safe handling and storage.

Beware of condensation. The substrate and uncured applied product must be at least +3 °C above the dew point to reduce the risk of condensation or blooming on the surface of the applied product. Low temperatures and high humidity conditions increase the probability of blooming.

The substrate must be dry or matt damp, with no standing water.

Note: Pot life begins when the resin and hardener are mixed.

Note: Pot life is shorter at high temperatures and longer at low temperatures.

Note: The greater the quantity of product mixed, the shorter the pot life.

Note: Apply the following methods for obtaining a longer pot life at high temperatures:

1. Divide the mixed product into smaller quantities.
2. Cool down parts A and B before mixing. Do not cool below +5 °C.

Maximum waiting time for wet-on-wet application on the Product:

If the maximum waiting time is exceeded, remove the Product before applying any further Product and prepare the substrate appropriately.

Note: Times are approximate and will be affected by changing ambient and substrate conditions.

For substrate roughness up to 1.0 mm and normal absorbency: 0.6–1.0 kg/m²

Note: Consumption data is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply the Product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.

Concrete and cementitious substrates must be older than 28 days, depending on any minimum strength requirements.

Cementitious substrates must be structurally sound and of sufficient compressive strength (minimum 25 N/mm²) with a minimum tensile strength of 1.5 N/mm².

The substrate must be sound, clean, free from all contaminants such as dirt, oil, grease, loose friable material, cement laitance, coatings and other surface treatments.

For the application of SikaScreed®-20 EBB, prepare concrete and cementitious substrates to a minimum substrate roughness of 0.5 mm according to EN 1766 or ≥ CSP 3 (International Concrete Repair Institute) or equivalent.

1. Remove weak cementitious substrates and contaminants such as dirt, grease and oil.
2. IMPORTANT The final texture of the substrate must be open-textured and gripping. Prepare cementitious substrates mechanically using abrasive blast cleaning, planing or scarifying equipment to remove cement laitance.
3. Pre-fill any surface voids with the SikaScreed® HardTop system in order to avoid excess thicknesses of the bonding agent in local areas.
4. Before applying the Product, remove all dust, loose and friable material from the application surface with an industrial vacuuming equipment.
5. For critical adhesion applications, perform preliminary site trials incorporating adhesion pull-off tests to confirm that substrate and Product tensile adhesion strengths are acceptable for the application.

1. IMPORTANT Mix full units only. Mix part A (resin) separately using a low-speed single-paddle electric stirrer (300–400 rpm) to mix liquid and all coloured pigment until the mixture achieves a uniform colour.
2. Add part B (hardener) to part A and mix both parts continuously for 3 minutes until the mixture achieves a uniform colour.

3. IMPORTANT Avoid over-mixing to minimise air entrainment. Pour the materials into a clean container and mix again for at least 1 minute to achieve a consistent mix and to ensure thorough mixing.

   Note: Total mixing time is 4 minutes.
4. Scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete mixing.

IMPORTANT

Incorrect assessment of structural design load when using the Product for structural applications

For structural bonding, the Product is formulated to have low creep under permanent loading. However, due to the creep behaviour of all polymer materials under load, the long term structural design load must account for creep.

1. Generally, the long term structural design load must be lower than 20–25 % of the failure load.
2. Consult a structural engineer for load calculations for structural applications.

IMPORTANT

Excessive drying of the Product

The subsequent SikaScreed® system needs to be applied wet-on-wet.

1. Observe pot life and waiting times.
2. Do not mix more Product than can be used for each area.
3. Remove any dried Product mechanically and replace it before applying the subsequent SikaScreed® system.

Preconditions

Any surface voids have been pre-filled with a SikaScreed® HardTop system.

Existing joints in the substrate must always be brought through the screed and appropriately formed and sealed as required.

1. Pour the mixed Product on to the prepared substrate, keeping the application area to 4 m² maximum.

   Note: The subsequent SikaScreed® system must be applied wet-on-wet. Observe overcoating times.
2. Apply the Product evenly to the required thickness using a stiff bristle brush or broom. For dry substrates, alternatively apply by roller or spray application.

3. Ensure all areas of the substrate are fully covered. Work the material well into the substrate.

   Note: This especially applies to damp concrete or cementitious substrates.
4. Protect from damp, condensation and water such as rain before applying subsequent products.

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