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Mapei Lamposilex: A Product Overview
Mapei Lamposilex is an ultra-fast setting hydraulic binder engineered to stop water leaks dead in their tracks—even under hydrostatic pressure. Designed for the remedial specialist and professional builder, this chloride-free powder mixes with water to form a plastic-thixotropic plug that sets in approximately 90 seconds. Whether you are sealing a gushing hole in a basement wall or waterproofing a potable water tank, Lamposilex delivers immediate structural integrity.
Because it cures rapidly with high early strength, you can plug the leak and move on to the next stage of waterproofing without downtime. It eliminates the risk of water damage spreading while you wait for standard mortars to cure. With AS/NZS 4020 certification, it is the smart, compliant choice for drinking water infrastructure. Simply mix, mold, and hold—zero doubt, instant seal.
17 MPa
Compressive strength in just 30 minutes
Key Features of Mapei Lamposilex
- Ultra-fast setting (approx. 1.5 mins): Flash-sets to block active water flow immediately, preventing flooding and damage.
- High early strength (17 MPa in 30 mins): achieves structural hardness almost instantly, allowing for rapid over-coating.
- No vertical slump: Thixotropic consistency holds its shape in overhead or vertical applications without formwork.
- Chloride-free formulation: Safe for use around steel reinforcement with no risk of inducing corrosion.
- Water and moisture repellent: Once cured, it becomes a permanent waterproof barrier.
The Mapei Lamposilex Advantage
- Stops Leaks Under Pressure: Designed to plug holes where water is actively gushing, saving you from costly pump-outs and delays.
- Zero Downtime: With a 30-minute cure strength that rivals standard concrete's 24-hour strength, you save labor time and finish fast.
- Versatile Application: Effective for everything from sealing rigid joints in tunnels to fixing household cisterns.
- Compliance Ready: Meets Australian Standards for potable water, protecting your liability on tank and reservoir projects.
Adheseal tips for using Mapei Lamposilex
Scenario: Mixing too large a batch
Potential Outcome: The product sets in the bucket within 60-90 seconds, wasting material and money.
Adheseal Best Practice: Mix only what you can use in 60 seconds (hand-sized amounts). Success means zero waste and a perfect plug every time.
Scenario: Hot weather application
Potential Outcome: High temperatures accelerate the set time to seconds, making it impossible to place.
Adheseal Best Practice: In warm conditions, keep the powder out of sunlight and use very cold water for mixing to buy yourself working time.
Applications in Practice: Trade Scenarios
For Waterproofers & Remedial Contractors: Active Leak Plugging
The Professional's Challenge
Water is actively entering a basement or lift shaft through a crack or hole. Traditional mortars wash away before they can set, leading to flooding and panic.
The Adheseal Solution
Prepare the hole with a dovetail cut (wider inside). Mix Lamposilex (2.5:1 by volume) by hand (gloves on). Mold it into a cork shape, wait for it to feel warm/start setting, then force it hard into the hole. Hold pressure for 2-3 minutes. It locks in instantly.
Best Practice Note
If you have multiple leaks, always start from the top and work your way down. This keeps your work area clearer and ensures a systematic seal.
For Tank Installers: Potable Water Sealing
The Professional's Challenge
Sealing joints or defects in concrete water tanks where the material must be non-toxic and compliant with AS/NZS 4020 standards.
The Adheseal Solution
Lamposilex is certified for contact with drinking water. Use it to seal rigid joints or fillets between walls and floors. It cures chemically clean and high-strength, preventing contamination issues.
Best Practice Note
Keep the surface damp for 15-20 minutes after application to ensure proper hydration and maximum strength development.
Frequently Asked Questions
Is Mapei Lamposilex suitable for potable water tanks?
Yes, Lamposilex is AS/NZS 4020:2018 certified for use in potable water systems. It is safe for sealing cracks and joints in drinking water tanks, reservoirs, and cisterns without leaching harmful substances.
How fast does Lamposilex hydraulic binder set?
It sets extremely fast, typically within 90 seconds (1.5 minutes) at 20°C. Because of this rapid cure, you must only mix small amounts (hand-sized) that can be applied immediately to ensure the material doesn't harden in the bucket.
Can I use Lamposilex to stop running water under pressure?
Absolutely, stopping running water is its primary function. To do this effectively, mold the mixed putty into a "cork" shape, wait a few seconds until it begins to warm up and stiffen, then force it firmly into the leak and hold constant pressure for 2-3 minutes until set.
How should I prepare the crack before applying the binder?
You must chase out the crack or hole to a minimum width and depth of 20mm (2 cm). Ideally, cut a "dovetail" shape (wider at the back than the surface) to physically lock the plug in place against the water pressure.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Instantly stopping active water leaks (including under pressure) | Ultra-fast set (~1.5 min) and high early strength control ingress rapidly | Waterproofers, Remedial Contractors |
| Sealing rigid wall–slab junctions | Dense, waterproof plug; damp-cure practice minimises shrink and improves seal | Builders, Waterproofers |
| Waterproof sealing of cracks and holes | Thixotropic, hand-mouldable paste for verticals; reliable mechanical key via dovetail | Builders, Remedial Contractors |
| Potable water infrastructure interfaces | Suitable for contact with potable water (AS/NZS 4020:2018) | Plumbers, Asset Maintenance |
Applying Mapei Lamposilex: Enhanced Protocols & Best Practices
-
Surface Preparation
Dovetail cavities (~20 mm × 20 mm), remove loose material and dust, wet to SSD.
Dovetail Opening
Cut with the wider section inside to create mechanical key and resist pressure blow-out.
Moisture Conditioning
Thoroughly pre-wet; remove free water with compressed air or sponge to achieve SSD.
Timing: Prepare just ahead of mixing to exploit the ~1 minute pot life.Pro Tip: Start with the highest leak point when multiple leaks are present to avoid re-pressurising lower repairs. -
Mixing
Mix 100:28 by weight (2.5:1 by volume) to a smooth, lump-free paste.
Manual Mix
Add powder to water while stirring with trowel until uniform. Prepare small batches only.
Warm Weather Control
Keep material out of sun; use very cold water to maintain working time.
Timing: Pot life ~1 minute at +20 °C; place immediately after mixing.Pro Tip: In cool conditions, store materials warm and use ~+20 °C water to avoid delayed set. -
Placement & Finishing
Hand-mould a plug and force into the cavity; hold 2–3 minutes until set, then trim excess.
Active Leaks
Apply from the top down when multiple leak points exist; maintain firm pressure during initial set.
Rigid Joints
Pack the mix tight with a trowel/float; keep surface damp for the first 15–20 minutes.
Timing: Initial set ~1.5 min at +20 °C; early high strength allows rapid return to works.Pro Tip: After hardening, dress the repair mechanically to match profile before membranes/finishes.
Limitations & Safety
Product Limitations
Do not add lime, cement or gypsum to Lamposilex.
Minimum application temperature +5 °C; pot life ~1 minute at +20 °C — prepare small batches only.
In warm weather, keep material out of direct sun and use very cold water. In low temperatures, use ~+20 °C water and store materials in a heated room.
Safety & Handling Requirements
Personal Protective Equipment
Wear safety glasses and suitable gloves; avoid skin and eye contact. Use protective clothing to minimise dust exposure during cutting and cleaning.
Ventilation Requirements
Ensure adequate ventilation during mixing and placement, particularly in confined spaces such as basements and tanks.
Fire & Handling Precautions
Non-flammable mineral powder. Handle bags to avoid damage; store dry and indoors. Keep out of reach of children.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do; continue rinsing and seek medical advice if irritation persists.
Skin:
Wash with soap and water. Remove contaminated clothing. Seek medical attention if irritation occurs.
Inhaled:
Move to fresh air and rest in a comfortable position. Seek medical attention if symptoms persist.
Swallowed:
Rinse mouth. Do not induce vomiting. Seek medical advice immediately.
Seek medical attention immediately in all cases of serious exposure.
Mapei Lamposilex Application Guide
Concrete & Masonry (Active Leaks)
Surface Preparation
Enlarge cracks or holes to a minimum of 2 cm width and depth. Create a dovetail cut (wider inside) to lock the material in. Remove all loose debris and incoherence material. If water is not actively running, saturate the area thoroughly with water before application.
Primer Requirements
No primer required
Lamposilex relies on mechanical locking and hydraulic setting. Pre-wetting the substrate is the only required preparation step.
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