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LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop

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Product Description

The LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop is a one component polyurethane water-swelling (hydrophilic waterstop) sealant with excellent and unique physical properties. It is a hydrophilic (water-loving) gun-grade material that expands in the presence of water, creating a watertight seal in concrete joints and structures. It can be applied to places such as joints in concrete, in civil engineering construction and water services for seals where conventional seals cannot be applied easily. After hardening, it has excellent physical properties together with rubberlike elasticity and water sealing properties.

This product is designed to be easy to apply with a standard caulking gun, making it a convenient solution for construction professionals.

The LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop is made from high-quality synthetic rubber, which gives it excellent durability and resistance to degradation from exposure to UV light, chemicals, and other environmental factors.

Overall, the LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop is an effective solution for waterproofing concrete structures, providing a long-lasting and reliable seal against water infiltration.


Main Advantages of the LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop.

Easy Application – As a moisture-cure one component type water-sealing. Standard caulking guns can be used as for conventional sealants.

Physical Properties – After hardening, it has better physical properties than those of conventional putty type sealants.

Water-Swelling – Swelling up to 2 times (approximately) by Volume as a result of its water absorption ability.

Cool Adherence – It adheres to various materials such as concrete, metals, glass, etc.

Areas of Application

Some arears of application for the LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop. 

1. Water sealing of joints in cast-in-situ concrete
2. Water sealing around steel posts/columns, king posts, that are cast into concrete
3. Water sealing around pipes for pipe penetrations through concrete
4. Box culverts & manholes joints
6. Form tie holes and form ties
7. Rough concrete surfaces of joints
8. Hydrostatic head pressure resistance of up to 2 bar (20metres)

Note : The products design and performance, its intended use, installation and final confirmation and approval for use, must be provided by the project’s Design Engineer and Project Manager.

Application Procedures

For the LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop.

1. Surface must be clean, dry and free of dirt, grease, oil & water.
2. Stir adhesive thoroughly before use.
3. Apply the adhesive to both surfaces to be bonded with a dry, clean, brush or scraper to give a uniform coating.
4. Allow the solvents to evaporate until adhesive film is “tacky” or “touch dry”. It will take between 10 to 20 minutes depending upon the surface porosity and the weather conditions.
5. Position the coated surfaces accurately before assembling them, and upon installation, apply an even pressure to the installed material to consolidate the bond.
6. Bond strength can be fully obtained after 24 hours.

3 mm 20 m
6 mm 10 m
8 mm 4-5 m
10 mm 3 m


Important Precautions

1. Minimum cover to LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop installed application from any outside edge. Refer to Figure 1 in the Product Brochure.
2. Do not apply as an external or surface position like a traditional sealant. Product must be fully encased by concrete.
3. Do not leave exposed to water for longer than 12 hours prior to second concrete pour being placed.
4. Allow to cure (harden) prior to pouring next concrete pour.
5. Use open cartridges within 24 hours after opening.
6. Store in a cool dark and dry place.
7. Shelf life of approximately 12 months from production date.

Written Specification

Where shown on the brochure drawings, the hydrophilic gun grade waterstop sealant shall be LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop as supplied by CORKJOINT. The Hydrophilic gun grade waterstop sealant is to be polyurethane based and able the be adhered on to concrete, steel, ceramic and/or plastic surfaces. It must have a minimum expansion capability of two times by volume (200%) and be able to withstand a minimum of 2.0 bar (20 meters) of hydrostatic head pressure resistance and proof of this must be provided by an independent laboratory test report. The product must be installed in accordance to the supplier’s installation guidelines and the Design Engineer’s specification.

Health and Safety Information

In confined spaces or in still air conditions, the use of a ventilation fan or suitable respirator should be used, and the advice and approval of the Site Safety Supervisor is essential. For further information or advice on health and safety precautions, safe handling, storage and correct disposal of products, please refer to the most recent product Safety Data Sheet (SDS), which is available upon request.


The information and the recommendations relating to the application and end use of this product are given in good faith and are based on the information provided by the manufacturer of the product and/or the Company’s current knowledge and experience in connection with the product when properly stored, handled and applied under normal conditions and no liability of final function at the job site is assumed. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability of, or fitness for, particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written and/or oral recommendations, or from any other advice offered by the Company. The Company also has no express or implied knowledge of any particular purpose for which the product is required and any such information given will not be taken into account in the supply of this product. No responsibility or liability by the Company will be accepted for misuse, misreading or derivation from recommended guidelines in respect of this product and the user shall determine the suitability of the product for his intended use and assume all risks and liability in connection therewith. The information contained in our brochure may change at any time without notice. Any use of this product, LEAKMASTER LV-Z Hydrophilic Gun Grade Waterstop, in any application should be approved as suitable for use/application by the Design Engineer and Project Manager.