Water leaks don't wait for dry conditions. When water is actively pouring in, you need an immediate, definitive stop. Lamposilex delivers that critical relief, sealing leaks even under pressure, preventing further damage and structural issues instantly.
Lamposilex is an ultra-fast setting hydraulic binder specifically engineered by MAPEI Research Laboratories to confront active water ingress. Unlike conventional mortars that demand dry conditions and extended curing, this specialised formulation sets directly into active leaks, even when under pressure.
Its chloride-free composition ensures substrate compatibility, while its plastic-thixotropic consistency allows vertical application without formwork. It owns the job of emergency sealing in critical environments like basements, subways, tanks, and structural joints.
With a pot life of approximately 1.5 minutes at +20°C, Lamposilex demands precise, rapid application. This ultra-fast setting ensures immediate leak control, even under active water pressure, requiring installers to mix only what can be applied instantly.
After only half an hour, it achieves 17 N/mm² compressive strength. This rapid strength development secures the repair against ongoing water force and allows subsequent work to proceed without extended delays. Its formulation is also certified to AS/NZS 4020:2018 for potable water contact, ensuring suitability for critical infrastructure like drinking water tanks and reservoirs.
Lamposilex requires quick action due to its rapid setting. Mix 1kg of powder with 280g of water, stirring manually with a trowel to achieve a smooth, lump-free paste. For stopping active leaks, mould the mix into a 'cork' shape, wait a few seconds for it to begin curing, then force it into the crack or hole. Maintain pressure for 2-3 minutes until fully set.
When sealing rigid joints, work the mix into the cavity immediately after preparation using a trowel or float. Keep the surface damp for the initial 15-20 minutes to aid optimal cure. For warm conditions, use very cold water for mixing and keep the material out of direct sunlight. In low temperatures, use water around +20°C and store the product in heated rooms to prevent delayed setting. Tools can be cleaned with water before the product hardens.
Yes, Lamposilex is AS/NZS 4020:2018 certified for potable water contact. It can be used for sealing cracks and joints in drinking water infrastructure without leaching harmful substances.
It sets rapidly, typically within 90 seconds at 20°C. This fast cure allows for immediate arrest of active water ingress, but requires mixing small batches for quick application.
Yes, stopping running water is its primary function. Mould the mixed material into a "cork" shape, wait for slight stiffening, then firmly force it into the leak and hold pressure for 2-3 minutes until fully set.
The minimum application temperature is +5°C. For cooler conditions, using water at approximately +20°C and storing materials in a heated area can help ensure proper setting.
| Application | Key benefit | Primary trades |
|---|---|---|
| Stopping active water leaks under pressure | Ultra-fast 90-second set controls water ingress immediately and prevents further damage. | Waterproofers, Remedial Contractors |
| Sealing rigid wall-slab junctions | Forms a dense, waterproof plug that minimises shrinkage and creates a lasting seal. | Builders, Waterproofers |
| Waterproof sealing of cracks and holes | Hand-mouldable, thixotropic paste allows for effective application on vertical surfaces and secure mechanical keying. | Builders, Remedial Contractors |
| Potable water infrastructure repairs | AS/NZS 4020:2018 certification ensures suitability for contact with drinking water systems. | Plumbers, Asset Maintenance |
Dovetail cavities (~20 mm × 20 mm), remove loose material and dust, wet to SSD.
Cut with the wider section inside to create mechanical key and resist pressure blow-out.
Thoroughly pre-wet; remove free water with compressed air or sponge to achieve SSD.
Mix 100:28 by weight (2.5:1 by volume) to a smooth, lump-free paste.
Add powder to water while stirring with trowel until uniform. Prepare small batches only.
Keep material out of sun; use very cold water to maintain working time.
Hand-mould a plug and force into the cavity; hold 2–3 minutes until set, then trim excess.
Apply from the top down when multiple leak points exist; maintain firm pressure during initial set.
Pack the mix tight with a trowel/float; keep surface damp for the first 15–20 minutes.
Wear safety glasses, suitable gloves, and protective clothing. Avoid skin and eye contact. Minimise dust exposure during handling.
Ensure adequate ventilation during mixing and placement, especially in confined spaces such as basements or tanks.
Store dry and indoors, avoiding direct sunlight. Shelf life is 12 months in original, unopened packaging. Dispose of contents and containers in accordance with local regulations.
Proper substrate preparation is critical for Mapei Lamposilex to achieve its hydraulic lock and prevent callbacks.
Surface prep: Chase out cracks or holes to a minimum width and depth of 20mm. Cut a dovetail shape (wider at the back) to create a mechanical key. Remove all loose debris and unsound material. If water is not actively running, saturate the area thoroughly with water before application.
Primer: Not required. Lamposilex functions via mechanical locking and hydraulic setting properties against a damp substrate.
| Property | Value |
|---|---|
| Base Chemistry | Hydraulic binder (high-strength cements with special admixtures) |
| Colour | Grey |
| Density | 1100 kg/m³ |
| Consistency | Fine powder, Plastic-thixotropic paste when mixed |
| pH Value | 12.8 |
| Compressive Strength | 46 MPa |
| Flexural Strength | 9 MPa |
| Pot Life | Approx. 1 minute |
| Initial Cure | Approx. 1.5 minutes |
| Application Temperature | +5°C |
| Mix Ratio | 2.5 parts Lamposilex : 1 part water (by weight) |
| Coverage Rate | 1.8 kg fills 1 dm³ cavity |
| Clean Up | Mechanical removal |
| Standards | AS/NZS 4020:2018 |
| Packaging | 1 box with 4 x 5 kg bags |
| Shelf Life | 12 months |
Here are some common examples on where Mapei Lamposilex (Waterplug) used by our customers.
