KuniSeal C-31DS is specifically designed to act as a moisture barrier in concrete construction joints, pipe penetrations, full bores and concrete repair. Its unique characteristics give it long lasting durability and superior waterproofing results, even when subjected to high hydrostatic pressure and in marine environments. It is also quick and easy to install. KuniSeal C-31DS is a composite product consisting of high swelling bentonite, mineral oil and modified polymer.



Kuniseal C-31DS sealing properties are unaffected by a small shower. Please remove standing water and cover forms or trenches with plastic tarps. Running water washes away the adhesive film.

Kuniseal C-31DS is not affected by freezing, light rain or sunshine, when protected from standing or moving water. Care must be taken not to step on or drop materials on Kuniseal that has been placed in a trench form.

Yes, Kuniseal C-31DS will swell in hot water. Water temperature has no influence on Kuniseal C-31DS’s efficiency.

No, swelling speed does not decrease after repeated wetting and drying. However the appearance of Kuniseal changes after drying.

Kuniseal has a shelf life of 3 years when stored in its original containers, in a dry and dark indoor storage area.

Yes, Kuniseal C-31DS is Alkaline (pH10) and is most efficient in the pH range of 4-12. The swell rate is reduced in high acid situations.

Yes, Kunisel C-31DS is a putty-like material. The nail will be sealed when covered and surrounded with waterstop. We recommend nailing for vertical installations.

Yes, in most cases Kuniseal C-31DS can be installed if there is room for hands and arms. Kuniseal is easy to cut and butt join on most surfaces.

The film is a water soluble plastic. It acts as an adhesive between the waterstop and the concrete. Please do NOT peel off the film except for butt joints and crack repair. 

Please provide at least 30mm of concrete coverage on all sides of Kuniseal C-31DS for maximum water stopping.

Yes, Kuniseal C-31Ds can be used at any temperature that concrete can be poured.

Attempt to reform the Kuniseal C-31DS into a triangular cross section. If not possible, remove and replace the crushed section with new Kuniseal C-31DS.

Kuniseal C31-DS Bentonite changed volume when wet, we can call it “Swelling”. When Kuniseal swells, it creates very little pressure that might crack a joint.

No. Kuniseal C-31DS works with the concrete or mortar covering to seal water out of the joint. The covering protects the bentonite from moving too far away from the joint.

No, Kuniseal C-31DS is a self-healing waterstop. Rubber or Butyl based materials become less effective over time and do not self-heal.