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Mapei LampoSilFlex 5kg ultra-flexible grout bag for tile joints up to 15mm
Mapei LampoSilFlex 5kg ultra-flexible grout bag for tile joints up to 15mm

Mapei Lamposilex (Waterplug)

Ultra-rapid hydraulic waterplug that sets in about two minutes to stop active leaks under pressure in suitable concrete and masonry.

Vendor: Mapei
SKU: LAMPOSIL/5
Availability: Out Of Stock
$49.53
$49.53
Prices do not include GST

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Description  

Lamposilex is an ultra-rapid hydraulic waterplug for stopping active water ingress in compatible concrete and masonry. It is designed for the repair moment when ordinary cement mortar would wash out before hardening: once mixed, it develops a firm plug in about two minutes under typical conditions.

Stop the leak before continuing the repair

A basement wall, water tank or below-ground concrete structure may have a concentrated leak through a hole or crack. Lamposilex allows the repairer to prepare the opening, mix a small amount and press the compound firmly against the ingress so the remaining waterproofing work can proceed. MAPEI also identifies uses in watertight rigid joints and suitable hydraulic structures.

Why speed matters

The extremely short setting time is the reason to choose Lamposilex, but it also means the surface and access must be prepared before mixing. It is a targeted leak-stopping compound, not a substitute for a complete waterproofing design or a flexible joint seal.

Before you start

Use only small workable mixes and observe site safety for pressurised leakage. MAPEI identifies potable-water suitability under AS/NZS 4020:2018; still confirm the intended complete system and current project requirements.

Common Questions  

Can Lamposilex stop water under pressure?
Yes. It is designed for instant stopping of active water leaks, including pressurised leaks.

How fast does it set?
About 1.5 to 2 minutes at 20°C.

Is Lamposilex suitable for potable water?
Yes. It is certified to AS/NZS 4020:2018.

Can it be applied below 5°C?
No. The technical guidance excludes application below 5°C.

Uses & Benefits  
Ultra-fast hydraulic binder for stopping active water leaks, including water under pressure. Sets in about 1.5 to 2 minutes at 20°C. Suitable for basements, tunnels, tanks and rigid wall-to-floor joints. Certified to AS/NZS 4020:2018 for potable-water contact. Waterproof and water-repellent after cure.
How To Apply  
Open leaking cracks or holes to form a mechanically keyed cavity and remove loose material. Pre-wet the prepared area, leaving the surface damp without standing water. Mix only a small quantity at a time because the material sets in about 1.5 to 2 minutes at 20°C. Shape the mix into a plug, force it into the leak and hold it under pressure until set. For rigid joints, work the fresh material into the prepared cavity immediately after mixing.
Limitations and Safety Info  
Do not add lime, cement or gypsum. Do not leave the product exposed to direct sunlight before use. Do not apply below 5°C. In hot conditions keep the product cool and use cold mixing water. In cold conditions store the product in a warm area and use water at about 20°C.
Suitable Substrates  
  • Concrete.
  • Cementitious masonry.
  • Rigid wall-to-floor joints.
  • Concrete tanks and below-grade structures.

Mapei Lamposilex (Waterplug) Physical Properties

Mapei Lamposilex (Waterplug) Physical Properties
Property Value
Base Chemistry Hydraulic binder (high-strength cements with special admixtures)
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
Full Cure Approx. 1.5 minutes
Application Temperature +5°C
Mixing Ratio 2.5 parts Lamposilex : 1 part water (by weight)
Coverage Rate 1.8 kg fills 1 dm³ cavity
Clean Up Mechanical removal
Shelf Life 12 months
Solid Content 100
pH 12.8
Bulk Density 1100

Mapei Lamposilex (Waterplug) - Use Cases

Here are some common examples on where Mapei Lamposilex (Waterplug) used by our customers.

Waterproofing

Stop Active Water Leaks

When active water leaks occur in basements, subways, tanks, or below-grade structures, requiring immediate sealing.

Its ultra-fast 1.5 minute setting time and rapid high strength development immediately stops pressure leaks, preventing further water damage.

  • 1.5 minute pot life
  • 17 N/mm² compressive strength (0.5 hour)
  • Vertical surfaces application
  • Active water leaks under pressure

Plumbing

Repair Potable Water Structures

For leak repairs in drinking water infrastructure, including tanks and pipelines, requiring immediate sealing and safety certification.

Certified safe for potable water contact, its rapid setting and strength development provides immediate, compliant repairs to vital infrastructure.

  • AS/NZS 4020:2018 certified
  • 1.5 minute pot life
  • Potable water systems
  • No chlorides in formulation

Civil Construction

Seal Rigid Wall-Slab Joints

Waterproofing rigid junctions between walls and floor slabs in concrete structures where movement is not expected.

Forms a dense, waterproof and water-repellent plug with high long-term strength, creating a lasting, low-shrinkage seal for fixed joints.

  • Waterproof and water-repellent
  • 46 N/mm² compressive strength (28 days)
  • Rigid joints sealing
  • No chlorides in formulation

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