Civil Engineering and Construction / Boring - Waterproof Materials (Seal Materials)

Summary of uses

Bentonite-based waterproof material that stops water infiltration

KUNISEAL is a waterproof material that takes advantage of the properties of bentonite. (For more details, refer to "What is bentonite?".) Bentonite is inorganic clay, and continues to produce an excellent waterproof effect semipermanently without degrading.
In placing additional concrete in building or civil engineering works, fine cracks develop due to the cure shrinkage of concrete. Especially, in an underground area, water infiltration from these cracks cannot be avoided. It is KUNISEAL that shuts out such water.
Conventionally, PVC or rubber water stops and waterproof materials have been often used, but KUNISEAL, unique plasticized bentonite, has significantly improved workability, waterproof performance, and durability. KUNISEAL does not require technical skills, and is easy to install, greatly contributing to shorter construction periods and cost reductions.

Since KUNISEAL C-31 was launched, new products have continuously been added to the lineup of the KUNISEAL Series. They have continued advancing as products that expand the market.
Technologies accumulated through the development of KUNISEAL were gathered to develop KUNISHEET, a waterproof sheet. KUNISHEET is a hybrid waterproof sheet made by combining bentonite and special modified asphalt.
It has been attracting attention from various fields as a product that may be able to resolve the difficulty of using waterproof sheets in joints or through holes.

KUNISHEET Waterproofing an underground outer wall

Waterproof mechanism of KUNISEAL

If in contact with infiltrating water, KUNISEAL, whose main component is bentonite, swells and fills fine, uneven cracks in concrete joints. This weather-stripping effect allows it to produce a waterproof effect. The process of swelling following contact with water and drying can be repeated any number of times, which enables the product to retain its waterproof performance semipermanently.

Installation procedure

Basic installation procedure for KUNISEAL C-31

Dip KUNISEAL in water to dissolve the film

Push KUNISEAL firmly against concrete

Fill a joint with KUNISEAL in such a way as to make a butt joint

It can be installed easily and reliably, and provides high waterproof performance wherever waterproofing is required.

It can be installed in uneven surfaces or vertical surfaces without requiring special treatment.

It can be used anywhere you can reach whether it is between reinforcing bars or a small area.

Product lineup

Product name Use Feature
KUNISEAL C-31 Concrete joints Clay type.
Very easy to install and shortens work construction periods. Flexible and free to deform and has the ability to repair itself.
KUNISEAL AB-2505 Concrete joints, Pipe circumference Tape type made of bentonite and asphalt.
The swelling speed can be controlled.
Has the ability to repair itself.
Has molding stability.
KUNISEAL AB-2025Y Secondary products of concrete
KUNISEAL EXTERNAL BT Installation external to concrete joints Can be nailed and shortens work construction periods.
The biodegradable film can be easily installed.
KUNISEPA For separators The self-fusing product can be cut first and then installed later.
KUNISEALPATE XL Gun type for repair use Fluid waterproof material for repairing areas of indefinite shape
KUNISHEET Waterproof sheet for outer walls Has the ability to repair itself and suitable for prior installation in underground waterproofing works.
KUNISLEEVE TP Spiral pipes, etc. Waterproof material of the new type made of bentonite and butyl rubber
KUNISTOPPER PH Waterproof material for scaffolds Waterproof material for scaffolds that just needs to be put in place