Mapei Mapeproof Swell: A Technical Overview
Mapei Mapeproof Swell is a one-component, hydro-expansive hydrophilic sealant paste supplied in 320 ml cartridges. It bonds to clean, slightly damp concrete and expands ≥100 % on contact with water. When properly confined, it forms a tough, elastic seal that resists hydrostatic pressure, making it ideal for pipe sleeves, cold joints, formwork spacers, and service outlets.
Core Features & Specifications
- Hydro-expansive seal: minimum 100 % swelling actively fills voids for leak-tight joints.
- High elasticity: > 700 % elongation flexes with concrete movement without cracking.
- Mechanical strength: Shore A 32, tensile 2.5 N/mm², tear strength 10 N/mm — stays secure under pressure.
- Application-ready paste: thixotropic, smooth extrusion bead (6–13 mm) for precise installation.
- Moisture-tolerant: bonds to clean, slightly damp substrates — no delays waiting for full drying.
- Controlled curing: skin forms 180–200 min, cures ~ 2 mm/9 h at 23 °C & 50 % RH.
- Long shelf life: 12 months at +15 °C to +25 °C in unopened cartridges.
The Mapei Mapeproof Swell Advantage
- Professional leak control that stands up to hydrostatic pressure.
- Minimises call-backs by stopping water tracking and seepage first time.
- Fast, neat application — saves time on-site and reduces labour costs.
- Durable, non-corrosive and insoluble for long-term protection.
Proactive Troubleshooting
Scenario: Applied Without Confinement
Potential Outcome: Bead expands outward, debonds or extrudes, causing leaks.
Adheseal Best Practice: Always apply in a rebate, chase or groove and confine with mortar or concrete to ensure hydrostatic performance.
Scenario: Dirty or Weak Substrate
Potential Outcome: Adhesion fails and water bypasses the bead.
Adheseal Best Practice: Mechanically clean, degrease with ethanol if required, and apply only to sound, slightly damp surfaces.
Applications in Practice: Trade Scenarios
For Waterproofers: Pipe Penetration Sealing
Water leaks along pipe sleeves causing site delays and callbacks.
Cut a rebate around the pipe, extrude a 6–13 mm bead of Mapei Mapeproof Swell, then backfill to fully confine. Hydro-expansion ensures a pressure-rated seal.
Degrease metal pipes, tool bead evenly, and ensure complete confinement to avoid extrusion.
For Remedial Contractors: Cold Joint Repair
Live leaks through construction joints where direct sealant placement is not possible.
Stop flow with a fast-setting plug, chase joint to ≥ 6 cm depth, extrude Mapei Mapeproof Swell, and confine with repair mortar both sides.
Compact mortar well to eliminate voids and maintain a continuous barrier against water ingress.
For Pool Builders: Outlet & Fixture Detailing
Sealing lights, drains and fittings in constantly wet, high-pressure environments.
Apply bead inside recess, install fixture or mortar to confine. Expansion maintains a tight seal even under pressure.
Do not overfill; use bead size that fits the recess so expansion is fully contained.
Frequently asked questions
Can I apply Mapeproof Swell to damp concrete?
Yes, Mapeproof Swell bonds to slightly damp, clean, and solid surfaces. Ensure no standing water is present on the surface before application to guarantee proper adhesion and expansion performance.
What bead size is recommended for Mapeproof Swell?
Use a bead diameter between 6 mm and 13 mm for optimal expansion and sealing. Cut the cartridge nozzle at the first line to achieve this size.
Why does Mapeproof Swell need to be confined?
Confinement is essential for Mapeproof Swell to function correctly. Its expansion upon water contact requires external pressure to form a dense, watertight seal, preventing it from simply expanding outwards without creating effective resistance against water.
What water pressure can Mapeproof Swell resist?
When properly confined and cured, Mapeproof Swell resists up to 1 atmosphere of water pressure. This provides a reliable watertight seal in conditions with significant hydrostatic load.
Applications and benefits
| Application | Key benefit | Primary trades |
|---|---|---|
| Sealing pipe penetrations and outlets in concrete | Creates a watertight seal to prevent leakage around services under pressure. | Builders, Plumbers |
| Sealing cold joints and cracks in concrete structures | Expands by ≥ 100% to fill voids and resist hydrostatic pressure, ensuring structural integrity. | Waterproofers, Concrete Contractors |
| Sealing lights and drainage outlets in swimming pools and tanks | Maintains a reliable seal under constant water exposure and hydrostatic conditions. | Pool Builders, Remedial Specialists |
| Sealing spacers in formwork | Prevents water ingress at formwork ties, maintaining concrete integrity. | Concrete Contractors |
Applying Mapei Mapeproof Swell: Enhanced Protocols & Best Practices
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Surface Preparation
Clean and remove all dust, debris, oil, and standing water. For cracked concrete, chase and widen cracks to at least 6 cm depth.
Timing: Prepare surface immediately before application to avoid contamination.Pro Tip: Use compressed air or a clean brush to remove fine dust for maximum adhesion. -
Application & Confinement
Cut nozzle to 6–13 mm opening, pierce cartridge seal, and extrude a continuous bead. Confinement is essential: embed in joint, cover with formwork or Mapegrout T40 before pour.
Timing: Wait until product has fully set before pouring concrete.Pro Tip: Keep cartridge at room temperature (+15 °C to +25 °C) for smooth extrusion.
Product limitations
- Not for: Surface-only applications. Mapeproof Swell requires confinement to function properly and resist water pressure.
- Not for: Application onto dirty, weak, or highly contaminated surfaces, including those exposed to acids or solvents.
- Not for: Use where standing water is present on the substrate before application.
Safety and handling
Personal protective equipment
Wear chemical-resistant gloves, safety glasses, and protective clothing to prevent skin and eye contact.
Ventilation
Use in well-ventilated areas. Avoid inhaling vapours, especially in enclosed spaces.
First aid
- Eyes: Rinse immediately with plenty of water for at least 15 minutes. Seek medical attention.
- Skin: Wash thoroughly with soap and water. Remove any contaminated clothing.
- Inhaled: Move to fresh air. If symptoms persist, seek medical advice.
- Swallowed: Do not induce vomiting. Rinse mouth and seek immediate medical attention.
Storage and disposal
Store cartridges in a dry place between 15 °C and 25 °C. The shelf life is 12 months from the production date in original, unopened packaging. Dispose of contents and container according to local regulations.
Substrate guide
Proper substrate preparation ensures Mapeproof Swell adheres correctly and performs its intended sealing function effectively.
Concrete and mortar joints
Surface prep: Remove dust, laitance, and loose particles. If sealing cracks, break them out to a depth of 6 cm where required. The substrate may be damp but must be free of standing water.
Primer: Not required. Direct adhesion to clean, sound concrete is sufficient for this product.
Mapei Mapeproof Swell Sealant Physical Properties
| Property | Value |
|---|---|
| Material Type | Hydro-expansive, rubber-based hydrophilic sealant paste |
| Chemical Composition | Insoluble in water (hydrophilic) |
| Colour | Light grey |
| Density | 1250–1300 kg/m³ |
| Viscosity | 700,000 mPa·s (Rotor F, 5 RPM) |
| Solids Content | 90 % |
| Tensile Strength | 2.5 N/mm² |
| Shore Hardness | 32 |
| Swelling | ≥ 100 % |
| Skin Time | 180–200 min |
| Cure Rate | 2 mm per 9 h |
| Coverage Rate | ≈ 320 ml per 3 m (for 6-13mm bead) |
| Maximum Gap Fill | 6–13 mm |
| Water Pressure Resistance | 1 atm (when confined) |
| Packaging | 320 ml cartridge, Box of 6 (320 ml each) |
| Shelf Life | 12 months |
| Storage Conditions | Dry place at 15 °C to 25 °C |