Merks Sealmax CB 504 Super Elastic: High-Adhesion Flexible Waterproofing Solution
Merks Sealmax CB 504 Super Elastic is a two-component waterproofing membrane based on cement and liquid polymers. Designed to provide superior elasticity and excellent adhesion, it offers reliable waterproofing performance for both interior and exterior applications. Its approved suitability for contact with potable water makes it an ideal choice for sensitive waterproofing projects such as water reservoirs and pools.
With its flexible structure and durable formulation, Merks Sealmax CB 504 Super Elastic helps protect structures against water penetration, moisture-related damage, and environmental effects.
Key Features
- Two-component cement and acrylic-based system
- Super-elastic waterproofing membrane
- High adhesion to concrete and cement-based substrates
- Suitable for horizontal and vertical applications
- Compatible with potable water contact
- Easy application by brush, roller, or trowel
- Paintable after curing
- Excellent resistance to positive water pressure
- Suitable for ceramic tile installations
- Long-lasting waterproof protection
Applications
Merks Sealmax CB 504 Super Elastic can be used in a wide range of waterproofing projects, including:
- Potable water tanks and reservoirs
- Bathrooms, toilets, and wet areas
- Foundations and basement walls
- Retaining walls
- Roofs, terraces, and balconies
- Swimming pools and decorative pools
- Planters and landscaping elements
- Protective coatings for bridges
- Concrete and cementitious structures requiring flexible waterproofing
Advantages
Superior Flexibility
Its highly elastic structure accommodates substrate movement and helps bridge minor cracks without compromising waterproofing performance.
Excellent Adhesion
Provides strong bonding to concrete, plaster, masonry, and cement-based surfaces.
Potable Water Approved
Suitable for applications involving direct contact with drinking water.
Easy Mixing and Application
The pre-measured powder and liquid components ensure consistent performance without the need for additional water.
Tile-Ready Waterproofing Layer
After the recommended curing period, ceramic tiles can be installed directly over the waterproofing membrane.
Surface Preparation
Before application:
- Remove dust, dirt, grease, oil, rust, and loose particles.
- Clean heavily contaminated surfaces using water jet cleaning when necessary.
- Repair cracks, tie-rod holes, and damaged areas using Merks Repair Plus repair mortars.
- Lightly dampen absorbent surfaces before application.
- Protect the substrate from direct sunlight during installation.
- Reinforce corners, joints, and pipe penetrations using Merks Bandix corner tape.
The substrate must be clean, sound, and sufficiently strong before waterproofing begins.
Mixing Instructions
- Shake Component B thoroughly before use.
- Pour Component B into a clean mixing container.
- Slowly add Component A while mixing with a low-speed mixer.
- Mix until a smooth, lump-free consistency is achieved.
- Allow the mixture to rest for 3–5 minutes.
- Remix for approximately 30 seconds before application.
The prepared mixture should be applied within 30–40 minutes at 20°C.
Application Procedure
First Coat
Lightly dampen the substrate and apply the first coat using a brush in a single direction. Allow it to dry before applying the next coat.
Second Coat
Apply the second coat perpendicular to the first coat to achieve complete and uniform waterproof coverage.
Additional Protection
In areas exposed to high water pressure, additional coats may be applied to improve waterproofing performance.
Consumption
| Application Type | Consumption |
|---|
| Per Coat | Approx. 1.5 kg/m² |
| Standard Two-Coat Application | 3–3.5 kg/m² |
| High Water Pressure Areas | 4–5 kg/m² (3–4 coats) |
Curing Times
| Property | Time |
| Mechanical Strength | 3 Days |
| Waterproof Performance | 7 Days |
| Final Strength | 14 Days |
Technical Specifications
| Property | Value |
| Material Composition | Mineral fillers, polymer-modified additives, special cement |
| Component A | Grey powder |
| Component B | Milky white acrylic copolymer dispersion |
| Mixing Ratio | 20 kg powder / 10 L liquid |
| Powder Density | Approx. 1.35 kg/L |
| Liquid Density | Approx. 1.07 kg/L |
| Mixed Density | Approx. 1.60 kg/L |
| Flexibility | High |
| Pot Life | Approx. 30 minutes |
| Adhesion Strength | ≥ 1.45 N/mm² (28 days) |
| Positive Water Pressure Resistance | 7 bar |
| Water Vapor Permeability | Class I (Sd) |
| Service Temperature | -20°C to +80°C |
| Tile or Render Application | After 3 days |
| Shelf Life | 12 months |
Packaging and Storage
Merks Sealmax CB 504 Super Elastic is supplied as:
- 30 kg set
- 20 kg reinforced kraft paper bag (Component A)
- 10 kg plastic container (Component B)
Store unopened packaging in dry, frost-free conditions. Shelf life is 12 months from the production date.
Important Notes
- Apply only to surfaces exposed to positive water pressure.
- Ambient and substrate temperatures must remain between +5°C and +35°C.
- The second coat should always be applied at a 90-degree angle to the first coat.
- Waterproofed surfaces exposed to mechanical loads should be protected with an appropriate finishing layer.
- Protect the liquid component from freezing. Frozen or thawed material must not be used.
- Clean all tools immediately after use with water.
Why Choose Merks Sealmax CB 504 Super Elastic?
Merks Sealmax CB 504 Super Elastic offers an ideal combination of flexibility, adhesion, and waterproofing durability. Its suitability for potable water tanks, swimming pools, foundations, terraces, and wet areas makes it a versatile waterproofing solution for residential, commercial, and infrastructure projects.
Frequently Asked Questions (FAQ)
1. Where can Merks Sealmax CB 504 Super Elastic be used?
It is suitable for potable water tanks, swimming pools, terraces, roofs, balconies, wet rooms, foundations, retaining walls, and a wide range of concrete structures.
2. Is it suitable for contact with drinking water?
Yes. The product is approved for use in potable water storage applications.
3. How many coats should be applied?
A minimum of two coats is recommended. Additional coats may be required in areas exposed to high water pressure.
4. Can ceramic tiles be installed over the membrane?
Yes. Ceramic tiles can be applied after the recommended curing period.
5. What makes the Super Elastic version different?
Its enhanced elasticity and higher positive water pressure resistance provide additional protection in demanding waterproofing applications where structural movement may occur.