What is Leakmaster LV-Z used for?

It is a one-component polyurethane water-swellable paste used to bond Hydrotite strips to rough concrete, seal pipe penetrations, and seal non-movement construction joints in cast in-situ concrete.

How is Leakmaster LV-Z applied?

Apply with a standard 320 mL cartridge gun in a continuous bead onto clean, dry concrete, shotcrete, metal or other surfaces. It cures by moisture and bonds firmly without solvents.

How much water pressure can it hold?

Once cured, Leakmaster LV-Z swells up to roughly twice its volume in contact with water and can support up to 20 m head of water pressure as a seal.

Is Leakmaster LV-Z approved for potable water?

Yes. It is certified to AS 4020:2018 for use in contact with drinking water, in line with the wider Fosroc waterstop system.

Can I use Leakmaster LV-Z on rough or shotcrete surfaces?

Yes. It is specifically designed to seal rough concrete, shotcrete and pipe penetrations where strip waterstops cannot follow the contour of the substrate.

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Parchem Leakmaster LV-Z 320mL

Name: Parchem Leakmaster LV-Z 320mL
Brand: Fosroc
SKU: PPAF31
Price: 62.00 AUD
Availability: InStock

$62.00

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Leak repair sealant for concrete and masonry. Flexible, fast curing, sticks to damp surfaces.

Parchem LEAKMASTER LV-Z is a low-VOC polyurethane leak sealant in 320ml cartridges. It sticks to damp concrete and masonry, cures flexible and handles minor substrate movement.

What it's for

Sealing leaks in concrete foundations, basement walls and masonry
Filling gaps and cracks before applying membrane or repair coatings
Works on damp surfaces. No priming required

Why waterproofers buy it

Sticks to damp concrete without primer
Low VOC formula. Safe for indoor use
Flexible when cured. Accommodates minor movement
Gun-applied. Fast and easy on site

Specs

320ml cartridge. Low-VOC polyurethane. Tack-free 15 minutes, full cure 7 days at 23°C and 50% RH.

Not for

Continuous water flow (active leaks), permanently submerged areas, or joints moving more than 10% annually.

Guns onto rough and uneven surfaces where solid waterstops will not sit

Swells to approx. 2 times its volume and supports 20m heads of water

Complies with AS/NZS 4020-2018 for contact with potable water

Quantity: 1

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Parchem Leakmaster LV-Z 320mL

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517

Product Details

Leakmaster LV-Z is a one component polyurethane water-swelling sealant with excellent and unique physical properties. It can be applied joints in civil engineering construction and water services, for seals where conventional solid sealants cannot be applied easily. After hardening, it has excellent physical properties together with rubber-like elasticity and water sealing properties.

How to Use

Cut the nozzle diagonally to the bead diameter required and gun a continuous bead without a break onto a clean dry surface.Confirm the surface is clean and dry and remove all debris, loose material, grease, oil and any organic materials
Break the moisture proofing aluminium foil on top of the cartridge and remove the metal back seamer from the bottom
Cut the nozzle diagonally at the position that gives the bead diameter required
Place the cartridge in a suitable cartridge gun
Apply Leakmaster continuously without a break to the place to be sealed
Where it is bedding Hydrotite on rough concrete, build the bead up to fill the imperfections in the concrete
Press the Hydrotite down into the Leakmaster until it oozes out and there are no visible gaps
Place a bead across every Hydrotite butt join
Protect the applied Leakmaster from any ponding of water whilst curing to prevent premature expansion
Allow a minimum of 12 hours before applying hand placed concrete, and 24 hours for large pours
Cover the applied Leakmaster with enough thickness of concrete coverage to avoid concrete cracking
Place the concrete once the Leakmaster has cured sufficiently to avoid displacement during the pour

Technical Specifications

Classification: Gun applied, water-swellable waterstop paste
Chemical Base: One component moisture-cure polyurethane water-swelling sealant
Appearance: Putty-like*
Colour: Grey*
Specific Gravity: 1.30*
Extrudability: Approx. 20 sec. at 23C*
Slump: Max. 3 mm at 23C*
Tack-Free Time: Approx. 8 hours at 23C, 60% RH*
VOC Content: 80g / litre*
Hardness After Hardening: 35 Spring-A-Type, JIS K 6253*
Tensile Strength After Hardening: 2.94 MPa, JIS K 6251*
Elongation After Hardening: 1250%, JIS K 6251*
Tear Strength After Hardening: 9.8 N/mm, JIS K 6252*
Swelling: Up to approx. 2 times in volume*
Hydrostatic Head: Supports 20m heads of water*
Adhesion, 50% Modulus: Steel 0.44 MPa, Aluminium 0.64 MPa, Mortar 0.64 MPa*
Adhesion, Max Tensile Strength: Steel 0.69 MPa, Aluminium 1.20 MPa, Mortar 1.09 MPa*
Adhesion, Elongation at Break: Steel 330%, Aluminium 580%, Mortar 570%*
Wait Before Concrete: Minimum 12 hours for hand placed concrete, 24 hours for large pours
Pack Size: 320 ml cartridge, FC000785-UNIT
Coverage: Approx. 3 metres per cartridge at a 10 mm diameter bead*
Storage: Cool, dry place below 32C
Shelf Life: 24 months after the production date shown on cartridge
Usable Period After Opening: Use within 24 hours after breaking the moisture-proofing foil
Standards Compliance: AS/NZS 4020-2018, AWQC Report 323761
Hazard Classification: Not classified as hazardous, not classified as Dangerous Goods
* Manufacturer published values to the stated test methods; the only accredited report held is the AWQC AS/NZS 4020 potable water report

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Parchem Leakmaster LV-Z 320mL

$62.00

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Technical overview

Leakmaster is a one component, moisture-cure polyurethane water-swelling sealant manufactured by C.I. Takiron Corp. and supplied in Australia by Parchem. It is gunned from a standard cartridge gun into non-moving or low movement joints in civil engineering, construction and water services where a conventional solid waterstop cannot be applied easily, and it is the specified bedding compound for fixing Hydrotite profiles to rough concrete. It swells up to approximately 2 times in volume on contact with water and supports 20m heads of water, keeping rubber-like elasticity after curing. Leakmaster holds an accredited AWQC report (323761) confirming compliance with AS/NZS 4020-2018 for contact with drinking water.

View full technical data sheet

Key applications

Bonding Hydrotite profiles to rough concrete surfaces
Water sealing joints of cast in-situ concrete
Water sealing around H section steel joists
Sealing against rough surfaces
Water sealing in shotcrete
Sealing joints in pre-cast box culverts
Pipe penetrations
Sealing around traditional heat welded PVC and Hydrotite waterstop joins before a concrete pour

Surface suitability

Concrete (clean and dry, all debris, loose material, grease, oil and organic materials removed)
Rough concrete surfaces where conventional solid waterstops cannot be applied easily
Shotcrete
Pre-cast box culverts
Steel H section joists
Pipe penetrations
Metal and glass (adheres before swelling)

Leakmaster should not be used for expansion joints or for joints subject to significant repetitive movements. Do not use in open face joints: it is not a sealant for general building applications. Do not leave in water for longer than 6 hours, and protect it from any ponding of water whilst curing to prevent premature expansion. Allow a minimum of 12 hours before applying hand placed concrete, and 24 hours for large pours where there is no guarantee that concrete will not be poured directly onto the seal. Cover the applied bead with enough thickness of concrete coverage to avoid concrete cracking. Avoid eye and skin contact and use only in well ventilated areas. Store in a cool, dry place below 32C and use the cartridge up within 24 hours after breaking the moisture-proofing foil.

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Technical Specifications

Classification	Gun applied, water-swellable waterstop paste
Chemical Base	One component moisture-cure polyurethane water-swelling sealant
Appearance	Putty-like*
Colour	Grey*
Specific Gravity	1.30*
Extrudability	Approx. 20 sec. at 23C*
Slump	Max. 3 mm at 23C*
Tack-Free Time	Approx. 8 hours at 23C, 60% RH*
VOC Content	80g / litre*
Hardness After Hardening	35 Spring-A-Type, JIS K 6253*
Tensile Strength After Hardening	2.94 MPa, JIS K 6251*
Elongation After Hardening	1250%, JIS K 6251*
Tear Strength After Hardening	9.8 N/mm, JIS K 6252*
Swelling	Up to approx. 2 times in volume*
Hydrostatic Head	Supports 20m heads of water*
Adhesion, 50% Modulus	Steel 0.44 MPa, Aluminium 0.64 MPa, Mortar 0.64 MPa*
Adhesion, Max Tensile Strength	Steel 0.69 MPa, Aluminium 1.20 MPa, Mortar 1.09 MPa*
Adhesion, Elongation at Break	Steel 330%, Aluminium 580%, Mortar 570%*
Wait Before Concrete	Minimum 12 hours for hand placed concrete, 24 hours for large pours
Pack Size	320 ml cartridge, FC000785-UNIT
Coverage	Approx. 3 metres per cartridge at a 10 mm diameter bead*
Storage	Cool, dry place below 32C
Shelf Life	24 months after the production date shown on cartridge
Usable Period After Opening	Use within 24 hours after breaking the moisture-proofing foil
Standards Compliance	AS/NZS 4020-2018, AWQC Report 323761
Hazard Classification	Not classified as hazardous, not classified as Dangerous Goods
* Manufacturer published values to the stated test methods; the only accredited report held is the AWQC AS/NZS 4020 potable water report

Frequently asked questions

View all FAQs

What is Leakmaster LV-Z used for?

Application
It is a one-component polyurethane water-swellable paste used to bond Hydrotite strips to rough concrete, seal pipe penetrations, and seal non-movement construction joints in cast in-situ concrete.
How is Leakmaster LV-Z applied?

Application
Apply with a standard 320 mL cartridge gun in a continuous bead onto clean, dry concrete, shotcrete, metal or other surfaces. It cures by moisture and bonds firmly without solvents.
How much water pressure can it hold?

Performance
Once cured, Leakmaster LV-Z swells up to roughly twice its volume in contact with water and can support up to 20 m head of water pressure as a seal.
Is Leakmaster LV-Z approved for potable water?

Compatibility
Yes. It is certified to AS 4020:2018 for use in contact with drinking water, in line with the wider Fosroc waterstop system.
Can I use Leakmaster LV-Z on rough or shotcrete surfaces?

Application
Yes. It is specifically designed to seal rough concrete, shotcrete and pipe penetrations where strip waterstops cannot follow the contour of the substrate.

Why trade professionals choose Fosroc

Fosroc is a construction chemicals brand supplied to the Australian trade, best known on site for below-grade and joint sealing work. The range we carry is focused on that job: Supercast Hydrofoil, Hydrotite Waterstop and Leakmaster LV-Z, for basements, retaining walls, lift pits and construction joints. Order online for delivery Australia wide, or call our team if you need help matching a product to an engineer's detail.

Shop all Fosroc