Uses

• Bonding the back of polystyrene insulation boards to masonry walls.
• Bonding insulation boards within external insulation finishing systems.
• Filling and bonding joints between polystyrene board edges.
• Providing durable adhesion between foam insulation and prepared masonry substrates.
• Suitable for compatible sound masonry and well-adhered painted surfaces.
• Suitable for thin-bed application using a notched trowel.

Advantages

• Polymer-modified cementitious adhesive.
• Provides persistent adhesion to foam insulation boards.
• Adhesion to foam exceeds the cohesive strength of the foam itself.
• Highly resistant to slump.
• Excellent water resistance.
• Rapid curing and bond-strength development.
• Easy-to-apply, smooth consistency.
• Requires only the addition of clean water.
• No additional polymer additives are required.
• Helps the insulation system accommodate minor building movement.
• Resistant to the effects of water efflorescence and rising damp.
• Environmentally friendly.
• Classified as C2TES1 according to EN 12004.

Standards Compliance

• Complies with EN 12004, class C2TES1.

Substrate Preparation

The foam surface and masonry substrate must be clean, completely dry and free from dirt, foam dust, grease, oil and other surface contaminants.

The masonry surface must be sound and non-friable. Painted surfaces must be firmly bonded to the substrate and compatible with EFS 50.

Remove weak coatings, loose material and contaminants that may reduce adhesion before application.

Mixing

1. Place approximately 5 litres of clean water in a suitable mixing container for each 20 kg bag.
2. Slowly add EFS 50 powder to the water while mixing.
3. Use a slow-speed electric drill fitted with a suitable mixing paddle.
4. Mix for at least two minutes until a smooth, homogeneous and slump-free consistency is obtained.
5. Allow the mixture to stand for 5–10 minutes.
6. Remix briefly before application.
7. Do not add water after the adhesive begins to harden.
8. Do not add supplementary polymer additives.

Application

1. Apply the mixed adhesive to the insulation board using a suitably sized notched trowel.
2. Hold the notched trowel at a consistent angle to produce correctly sized adhesive ribbons.
3. Press the trowel firmly while forming the ribbons.
4. Avoid allowing excess adhesive to accumulate between the adhesive ribs.
5. Keep the trowel notches clean throughout application.
6. Position and press the insulation board against the prepared substrate within the adhesive’s open time.
7. Ensure adequate and uniform contact between the board and substrate.

Yield and Coverage

One 20 kg bag mixed with approximately 5 litres of clean water produces approximately 15 litres of adhesive mortar.

The stated yield is approximate. Actual consumption depends on substrate condition, surface level, trowel size, application method and material wastage.

Cleaning

Clean tools immediately after completing the application using clean water. Hardened material must be removed mechanically.

Storage and Shelf Life

EFS 50 has a minimum shelf life of 12 months when stored in its unopened and undamaged original packaging in a dry, shaded place, away from direct sunlight, at an ambient temperature below 35°C.

Packaging

• 20 kg paper bags.

Health and Safety

• Wear suitable protective gloves and safety goggles during mixing and application.
• Avoid unnecessary contact with the skin and eyes.
• In case of skin contact, wash immediately with soap and clean water.
• In case of eye contact, rinse immediately with plenty of clean, cold water.
• Seek medical advice if irritation continues.
• The product is non-flammable and is not classified as hazardous under current legislation.
• Do not dispose of the material in water or soil. Follow applicable local disposal regulations.

Quality and Technical Support

WHITE SAND products are manufactured under an independently certified quality management system in accordance with ISO 9001:2015 requirements.

WHITE SAND provides technical assistance regarding substrate preparation, insulation-board bonding, application requirements and external insulation finishing systems.