Uses

• Laying and fixing lightweight aerated concrete blocks.
• Fixing similar lightweight masonry blocks and units.
• Producing thin, uniform horizontal and vertical block joints.
• Suitable for internal and external lightweight-block construction.
• Suitable for applications requiring high adhesion and reduced mortar-joint thickness.

Advantages

• High-quality polymer-modified cementitious adhesive mortar.
• Excellent application properties and workability.
• High bond strength.
• Resistant to shrinkage.
• Slump-free consistency with no sagging.
• Suitable for hot-climate conditions.
• Helps maintain the thermal-insulation performance of lightweight-block walls.
• Requires only the addition of clean water.
• Available in white and grey.
• Complies with EN 12004, class C2.

Standards Compliance

• Complies with EN 12004, class C2.
• Tensile adhesion strength tested according to EN 1348.

Substrate Preparation

Clean lightweight blocks using a suitable brush to remove dust, loose particles and surface contamination.

Neutralize excessive block suction by applying clean potable water. Allow standing or excess water to disperse before applying FIX LB. The block surface should be damp without pooled water.

Mixing

1. Place approximately 5 litres of clean water in a suitable mixing container for each 20 kg bag.
2. Slowly add FIX LB powder to the water while mixing continuously.
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 mortar begins to harden.

Application

1. Apply the mixed adhesive mortar to the prepared block surface using a suitable trowel.
2. Comb the mortar in straight ribs using a suitably sized notched trowel.
3. Position the block within the adhesive’s open time.
4. Press the block firmly into the mortar.
5. Form uniform horizontal and vertical joints with the minimum practical gap.
6. Check the block alignment and level before proceeding.
7. Remove excess mortar before it hardens.

Curing

Under normal ambient conditions, special curing is generally not required.

During rapid-drying conditions, such as direct sun, high temperatures or strong dry winds, apply a light mist of clean water three to four times daily for at least three days.

Yield and Coverage

One 20 kg bag mixed with approximately 5 litres of clean water produces approximately 14 litres of adhesive mortar.

The stated yield is approximate. Actual consumption depends on block dimensions, surface level, joint thickness, 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

FIX LB 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 developed and manufactured under a quality-oriented product-development process and an independently certified quality management system.

WHITE SAND provides technical assistance regarding block preparation, adhesive selection, mixing, lightweight-block installation and curing requirements.