KYK Megaİzo 2K S303 – Two-Component, Elastic Bitumen Emulsion-Based Waterproofing System

KYK Megaİzo 2K S303 is a two-component, solvent-free waterproofing material based on polymer-modified bitumen emulsion. After curing, it forms a seamless and elastic waterproof membrane layer on the applied surface.

Thanks to its high adhesion performance and capillary crack-bridging ability, it can be safely applied on both horizontal and vertical concrete surfaces.

Application Areas

Megaİzo 2K S303 provides effective solutions for the following structural elements:

• Foundation and sub-foundation applications
• Basements, cellars and underground parking areas
• Retaining walls and below-ground concrete structures
• Wet areas such as bathrooms, kitchens and balconies
• Interior and exterior concrete surfaces

It is a reliable waterproofing solution for underground applications and areas exposed to the risk of seepage water.

Product Advantages

• High capillary crack-bridging capacity
• Suitable for underground waterproofing applications
• Does not sag or flow on vertical surfaces
• Strong adhesion to concrete surfaces
• Forms a seamless and elastic membrane layer
• Easy to prepare and apply
• Solvent-free and environmentally friendly

Suitable Application Surfaces

Wall Applications

• Cement-based plaster
• Concrete (with MegaFilm İzo A301 primer)
• Existing bituminous surfaces

Floor Applications

• Cement-based screed
• Concrete (with MegaFilm İzo A301 primer)
• Existing bituminous surfaces

Surface Preparation (Summary)

The surface must be dry, clean, sound and free from substances that may reduce adhesion.

• Repairs deeper than 1 cm: MegaTamir İ T101 / K T102
• Structural repairs: T103 / T104
• Edge and corner fillets: T103 / T104
• Weak areas: Megaİzo Band S901
• Gaps around drains: MegaTamir Grout T105 / T107
• Tie rod and core drill holes: Must be cut back at least 2 cm inward and repaired with T103 / T104

On cement-based surfaces, MegaFilm İzo A301 primer should be applied as a single coat and allowed to dry for a minimum of 5 hours.

Proper surface preparation is critical for achieving the full performance of the product.

Application Method

Mixing ratio:

• 18 kg liquid component + 6 kg powder component (the entire set must be mixed)

The powder component should be slowly added into the liquid component and mixed with a low-speed mixer until a homogeneous consistency is achieved.

• Apply at least 2 coats with a target dry film thickness of minimum 3 mm.
• Each coat should be applied perpendicular to the previous coat.
• Application temperature: Between +5°C and +35°C
• Under conditions of +5°C to +15°C temperature and relative humidity above 60%, applying at least 3 coats is recommended.
• Where necessary, reinforcement can be provided between coats using Megaİzo Mesh S902.

Application Times

Important Warnings

• The application thickness should be increased in areas exposed to pressurized water.
• Soil filling or screed application should not be performed before complete drying is achieved (minimum 3 days).
• After curing is completed, the surface should be protected with thermal insulation boards, drainage boards or geotextile materials.
• It should not be applied against negative water pressure.
• Application should be avoided during rain, frost risk, strong wind or direct sunlight exposure.
• Do not add any foreign materials into the product and do not use mixtures that have exceeded their pot life.

Technical Specifications

Packaging, Shelf Life and Storage

Packaging:

24 kg bucket
(18 kg liquid component + 6 kg powder component)

Shelf life:
12 months (in original and unopened packaging)

Storage conditions:
Store between +5°C and +25°C in dry areas with less than 60% relative humidity and away from direct sunlight. Keep packaging tightly closed when not in use.

Frequently Asked Questions

1) Where is KYK Megaİzo 2K S303 used?

It is used for underground foundation and retaining wall waterproofing applications, as well as protection against seepage water in wet areas.

2) How many coats should be applied?

At least 2 coats should be applied to achieve a minimum dry film thickness of 3 mm. Under cold and humid conditions, 3 coats are recommended.

3) Is primer application required?

Yes. On cement-based surfaces, MegaFilm İzo A301 primer should be applied as a single coat and allowed to dry for at least 5 hours.

4) When is mesh reinforcement required?

Megaİzo Mesh S902 is recommended between coats on surfaces exposed to high stress, such as floors and vertical surfaces.

5) When can soil backfilling begin?

Soil backfilling can begin after a minimum of 3 days. For full performance, waiting 7 days is recommended.

6) Is it resistant to negative water pressure?

No. It should not be used in areas exposed to negative water pressure.