CLASSIFLEX™ MORTAR ADD MIX is a Styrene-Acrylic copolymer emulsion with exceptionally good flexibility, developed for use with Portland cement.


For use with cement mortars and concrete mixes to give excellent water resistance, enhanced adhesion and good flexibility, enhances strength, resilience and load bearing properties. Also improves workability and flow of cement bound mixes.

Prevents and /or Stops Damp on Interior/Exterior Walls, Shower Floors and Walls, Retaining Walls, Concrete Decks / Reservoirs, Concrete / Mortar Dams, Concrete Walkways, Garden Walls, etc. Ideal for water tanking, a method of preventing water ingress or seeping by creating a completely impermeable waterproof barrier on an internal wall. Tanking is in reference to below ground structures like basements or as a precautionary measure on damp walls above ground.

Level of Usage: 20% based on weight of cement; 20 – 30% may be required for improved adhesion on thin screeds. CLASSIFLEX™ can be used with Portland, High Alumina and fast setting cements. To counteract darkening of modified cement, white cement may be added.


It is non-toxic and non-corrosive. It is very easy to apply. You prepare mortar with ordinary methods, but you just use Less Water and Add CLASSIFLEX™.

  • Suitable for Interior and Exterior applications

  • Makes high strength shock resistant mortar

  • Water Resistant

  • Excellent Cement Compatibility

  • Low Temperature Performance

  • Flexibility and Tensile strength

  • Alkali Resistant

  • Weather Resistant

  • Reduce shrinkage in Tile Grouts

  • Improves Resistance in Tile Grouts to urine, dilute chemicals sugar solutions and lactic acid

  • It can be used for horizontal patching (e.g. floors), vertical overhead patching

  • Used in New applications and Repair Work

  • Suitable to be painted over

It does not affect the setting period of ordinary Portland cement.


  • Reservoirs

  • Ponds

  • Tanks

  • Retaining Walls

  • Shower Floors and Walls

  • Screeded Roofs and Concrete Balconies

  • Concrete Masonry

  • Veranda Floors before Tiling

  • Tile Adhesives and Grouts


  • DENSITY - Emulsion polymer 1.04 - Dry polymer 1.07;

  • VISCOSITY - 200 - 800 cPs (Brookfield LVT #3 @ 30rpm) - 800 - 1500 cPs (Brookfield RVT #4 @ 20rpm);

  • SPECIFIC GRAVITY - 1.49 - 1.51;

  • PH - 7 - 8%;

  • FLASH POINT - Not applicable;

  • COLOUR RANGE - Milky White;

  • PACKING SIZE - 5 Litres and 20 Litres and

  • 225kg steel returnable open head drums, 1060kg mini-bulks and 5.5mt bulk loads - Subject to Quotaion, availability and Yield Time.


  • All surfaces should be structurally sound, clean and free of all dirt, oil, grease, paint, concrete sealers or curing compounds. Rough or uneven concrete surfaces should be made smooth with CLASSIC DAMP SLURRY™ to provide a wood float (or better) finish. Dry, dusty concrete slabs or masonry should be dampened and excess water swept off. Installation may be made on a damp surface;

  • Add to mortar mix, use less water to maintain consistency;

  • Bagging and Render could be added with Block Brush;

  • All applications like Plaster, Building Mortar, Decking/Screed, Tile Grout to be applied as usual;

  • Concrete to be poured as usual.


Store under cover, away from damp, rain, frost and direct sunlight.


  • The usage and storage ambient temperature must be between 5ºC and 35ºC and humidity between 10% and 85%;

  • Avoid applying under adverse weather conditions as this could result in poor product performance;

  • Tools and implements used for mixing and applying CLASSIFLEX™ modified cement mixes must be cleaned after use;

  • All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.


  • Always keep out of reach of children and animals;

  • Do not take in orally - harmful if swallowed. Seek medical attention and do not induce vomiting;

  • If accidental contact with eyes, rinse immediately with plenty of water and seek medical advice;

  • Ventilate the area to be painted, opening all doors and windows and using fans during application and drying;

  • Protect floors with cloth Drop Cloths, not plastic, which is far more slippery;

  • Make sure your ladder is in good shape. Set the legs on an even surface and lock the cross braces. Do not stand on the top of the ladder or on the utility shelf. If you are having difficulty reaching a spot, get down from the ladder and move it rather than leaning out;

  • Clean up carefully and thoroughly when you are done for the day.


Different surfaces and environmental conditions require specific painting systems to produce the best possible results - It is, therefore, recommended that you contact a representative from Classic Paints for advice on all your painting requirements, whenever possible.

The information, and, in particular, the recommendations relating to the application and end-use of Classic Paints products, are given in good faith based on Classic Paints’ current knowledge and experience of the products when properly stored, handled and applied under normal conditions. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the Product Data Sheet for the product concerned, copies of which will be supplied on request.


23/05/2022 - This supersedes all previous publications - This technical data furnished is obtained from controlled laboratory tests under ideal application conditions. No guarantee of any performance characteristic is given or implied and we do not hold ourselves responsible for any consequential damage of whatsoever nature that may arise from use of our products. In the event of a proven product fault our liability will be limited to the replacement of the product only. It is the user’s responsibility to confirm the currency of product data sheets.

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