Merks Sealmax CB 504 Full Elastic: High-Performance Waterproofing for Critical Applications
Merks Sealmax CB 504 Full Elastic is a two-component, highly flexible waterproofing membrane formulated with special cementitious binders, polymer-modified additives, and liquid acrylic polymers. Designed to provide superior adhesion and long-lasting waterproof protection, it can be applied safely on a wide variety of construction surfaces.
Its fully elastic structure allows the membrane to accommodate substrate movement while maintaining waterproof integrity. The product is also approved for applications involving contact with potable water.
Key Features
- Two-component waterproofing system
- Cement and acrylic polymer-based formulation
- Full elastic performance
- Excellent adhesion to mineral substrates
- Suitable for horizontal and vertical surfaces
- Compatible with potable water applications
- Can be applied by brush, roller, or thin trowel
- Paintable after curing
- Crack-bridging capability
- Long-term waterproof protection
Areas of Application
Merks Sealmax CB 504 Full Elastic is recommended for:
- Bathrooms, showers, toilets, and wet rooms
- Roofs, terraces, and balconies beneath protective coverings
- Swimming pools and decorative pools
- Potable water tanks
- Planters and flower beds
- Concrete structures exposed to water pressure
- Interior and exterior waterproofing applications
Advantages
Superior Flexibility
The fully elastic structure absorbs minor substrate movements and reduces the risk of waterproofing failure caused by cracking.
Excellent Adhesion
Provides strong bonding to concrete, cement-based renders, masonry, and similar mineral surfaces.
Potable Water Approved
Suitable for applications involving contact with drinking water.
Easy Application
Can be applied using standard waterproofing tools such as brushes, rollers, and trowels.
Ready-Mix Components
Powder and liquid components are supplied in pre-measured ratios, eliminating the need for additional water.
Surface Preparation
Before application, surfaces must be:
- Structurally sound and fully cured
- Clean and free from dust, oil, grease, rust, and loose particles
- Repaired where necessary using Merks Repair Plus repair mortars
Large cracks, tie-rod holes, and damaged areas should be repaired prior to waterproofing. The substrate should be lightly dampened before application and protected from direct sunlight. Corners, joints, and pipe penetrations should be reinforced using Merks Bandix corner tape together with Merks Sealmax CB 504 Full Elastic.
Mixing Instructions
- Shake Component B thoroughly and pour it into a clean container.
- Slowly add Component A while mixing with a low-speed drill mixer.
- Continue mixing until a homogeneous, lump-free consistency is obtained.
- Allow the mixture to rest for 3–5 minutes.
- Mix again for approximately 30 seconds before application.
The prepared material should be used within 30–40 minutes at 20°C.
Application Procedure
First Coat
Apply the first coat onto the dampened surface using a stiff brush in a single direction. Allow it to dry sufficiently before applying the next coat.
Second Coat
Apply the second coat perpendicular to the first coat to ensure complete coverage and uniform waterproofing performance.
Additional Coats
For structures exposed to high water pressure, three to four coats may be applied depending on project requirements.
Consumption
- Approx. 1.5 kg/m² per coat
- Recommended minimum application: 2 coats
- Standard waterproofing system: 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 |
| Flexibility | High |
| Pot Life | Approx. 30 minutes |
| Adhesion Strength | ≥ 1.25 N/mm² (28 days) |
| Positive Water Pressure Resistance | 5 bar |
| Water Vapor Permeability | Class I (Sd) |
| Capillary Water Absorption | Class W |
| Tile Installation Time | After 3 days |
| Application Temperature | +5°C to +35°C |
| Powder Density | Approx. 1.35 kg/L |
| Liquid Density | Approx. 1.05 kg/L |
| Mixed Density | Approx. 1.55 kg/L |
| Service Temperature | -20°C to +80°C |
| Mechanical Resistance | 3 days |
| Waterproofing Performance | 7 days |
| Shelf Life | 12 months |
Packaging and Storage
Merks Sealmax CB 504 Full Elastic is supplied as a:
- 27 kg set
- 20 kg reinforced kraft paper bag (powder component)
- 7 kg plastic container (liquid component)
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 be between +5°C and +35°C.
- The second coat should always be applied at a 90-degree angle to the first coat.
- Waterproofed surfaces must be protected with an appropriate covering layer.
- Protect the liquid component from freezing. Frozen and thawed material must not be used.
- Clean tools immediately after use with water.
Why Choose Merks Sealmax CB 504 Full Elastic?
Merks Sealmax CB 504 Full Elastic combines superior flexibility, excellent adhesion, and durable waterproofing performance in a professional two-component system. Its suitability for potable water tanks, swimming pools, terraces, balconies, and wet areas makes it an ideal solution for projects requiring long-term protection against water infiltration.
Frequently Asked Questions (FAQ)
1. Where can Merks Sealmax CB 504 Full Elastic be used?
It is suitable for wet rooms, terraces, balconies, swimming pools, potable water tanks, planters, and a wide variety of waterproofing applications.
2. How many coats should be applied?
A minimum of two coats is recommended. Additional coats may be required for areas exposed to higher water pressure.
3. Is it suitable for contact with drinking water?
Yes. The product is approved for potable water applications.
4. Can ceramic tiles be installed over the waterproofing layer?
Yes. Ceramic tiles can be installed after the recommended curing period has been completed.