NEW AGE CEMENT BASED CRYSTALLINE WATERPROOFING SYSTEM
FOR NEW & OLD STRUCTURES

The most unique characteristic is that the system is not based on Sodium Silicate and therefore is not a rigid system. The Chowgule Koster NB / NB Elastic system uses a carboxylated SBR latex as one of its components. Due to this it has flexibility and elasticity and can bridge dynamic cracks up to 2 mm. Further, once applied it self cures and does not require to be water cured. Sodium Silicate based systems require to be water cured for 4 – 6 days. This is the duration for the crystalline process to be completed.
Another unique feature is that it is alkaline and has a pH value of 11.5 which makes it most compatible with concrete whose pH is around 12. It passes the water portability tests for drinking water and therefore can be installed without a cement screed protection in drinking water tanks.

Basements, water bodies, water tanks, terraces, toilets, balconies are amongst some of the areas that can be effectively treated with this system.

How does crystallization in waterproofing work?
On application, the product penetrates into the pre – dampened and water saturated substrate, using the water as a medium and then through the process of osmosis forms silicate crystals deep in the pores, capillaries and voids in the substrate. Once installed, this is not a surface coating but an impregnation system that has become an integral part of the substrate.

FEATURES
Cement based crystalline waterproofing system which is not sodium silicate
Self-curing
Has elasticity ranging from 15 % to 85 %
It has a pH value of 11.5 same as that of concrete making it very
compatible with concrete.
Can be used on positive and negative side of structures.
Pot life over one hour (at 30 C)
Can be used on new (green) and old concrete.
It is not a vapour barrier.
It has excellent self-healing properties.
It has excellent adhesion properties to concrete.
It penetrates beneath the surface and anchors itself.
It crystallises within the substrate
It is non toxic and environmentally safe (water based)
It is safe when used with potable water
It can be used on below and above grade concrete.
It can be used on block, brick concrete, gunite, shotcrete etc.
It can be painted (no lime based paints)
It can be used between slabs and in constructions joints.
Only one coat required when spray applied.

APPLICATION
The application method is simple but the step wise procedure must be followed. Surface preparation is carried out by thoroughly cleaning the surface to be waterproofed with water either manually or by using high pressure water jets.
All construction joints and cracks of 1 mm. width or more are opened up in a V groove, cleaned and filled with high strength Polymer Reinforced Mortar.
All horizontal to vertical joints and vertical to vertical joints (for water tanks and water bodies) in the structure are treated by building up with fillets / vatas using the same Polymer Reinforced Mortar.
The surface is then once again cleaned and then doused continuously and thoroughly with water prior to the application of the system.
The Koster NB Grey powder – 25 kg bag – is mixed with 1.5 ltrs of Koster SB Bonding Emulsion and 6.5 ltrs of water and mixed thoroughly until a smooth consistency is achieved. This is then vigorously applied to the pre dampened surface by special brushes.
The Koster NB Grey is applied in 2 to 3 coats depending on the area of application. Once this application is complete all joints and areas filled with Polymer Reinforced Mortar is then over treated with the Koster NB Elastic system. This is also a 2 component product – 25 kgs. Powder is mixed with 8 ltrs of polymer.
After air curing for 24 – 48 hours the installed system can be tested by water ponding.