What is ACTFLEX PU300 used for?

PU300 is a hydrophobic polyurethane crack injection with an adjustable reaction profile - the 2-component design (resin + accelerator) lets you tune the cure speed to match the specific crack and water conditions on site.

How does the adjustable cure work?

Mix 10:1 base resin to accelerator for controllable cure timing. Foaming time 150-600 seconds depending on accelerator dose. Faster cure for high-flow leaks, slower cure for deep penetration in dry cracks.

Viscosity 450-600 mPa·s. Bond strength to concrete exceeds 2.28 MPa. Elongation greater than 100% (thick) or 250% (thin film). Density 1.12-1.2 g/cm³. Apply at greater than 10°C ambient.

When should I use PU300 vs PU200?

Use PU300 when you need adjustable cure timing for difficult conditions (heavily wet cracks, deep structural cracks). Use PU200 for standard hydrophobic injection where the fixed cure profile works.

What does the cured foam look like?

Light brown closed-cell hydrophobic foam. Immediately waterproofs cracks on water contact. 12-month shelf life when stored sealed. Safe for indoor work with appropriate ventilation.

Forspec ACTFLEX PU300 22kg kit comprising PU300 single-line semi-hard polyurethane foam and PU300 Accelerator for fast-reacting crack injection and leak sealing applications.

Be the first to review

ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane

Name: ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane
Brand: Forspec Protective Coatings
SKU: AACF517
Price: 638.00 AUD
Availability: InStock

$638.00

or 4 interest-free payments with

Two-pack hydrophobic PU injection resin with the accelerator in the box. Dose it to set the reaction time.

ACTFLEX PU300 is a two-component hydrophobic polyurethane injection resin: 20 kg base resin plus 2 kg accelerator, mixed 10 to 1 by weight. The accelerator dose sets the reaction time, so you tune it to the temperature and the water flow. On contact with water the mix expands to a closed-cell foam that seals cracks, construction joints and voids.

Where to use it

Active leaks in concrete ceilings, walls, floors and construction joints
Basements, tunnels, underground structures and retaining walls
Non-structural void filling in concrete
Dams, reservoirs, wastewater structures and pipelines
Wet or dry cracks. Pre-wet dry cracks through the packers

Why waterproofers buy it

Reaction time from 150 to 200 seconds at 2 to 1, up to 340 to 360 seconds at the standard 10 to 1
Works in flowing water and high moisture
Free-foam expansion above 15 times
Hydrophobic closed-cell foam. No shrinkage, no need for permanent water contact
Bond to concrete greater than 2.28 MPa
Pot life 20 to 30 minutes once mixed
22 kg set. 10 year Forspec product warranty

Coverage

No fixed rate. Consumption depends on crack width, depth and voids. Estimate from crack volume and confirm by trial injection.

Not for

Structural crack repair (use the FORSPEC structural injection range), dry cracks unless pre-wetted, below 10°C, UV exposure, movement joints, or drinking-water structures without written Forspec confirmation. Keep containers, gear and lines dry.

All times at 25°C and 50% RH. Forspec R&D typical values.

Accelerator dosage tunes the reaction time to ambient temperature and water flow

Works in flowing water and high moisture, and in dry substrates when pre-wetted

Free-foam expansion above 15 times fills voids, cavities and construction joints

Quantity: 1

7-Day Money BackGuarantee

Fast DispatchNext Business Day

Expert Advice(02) 8021 3517

Secure CheckoutSSL Encrypted

Get it — —

Pickup available at The Waterproofing Shop

Usually ready in 24 hours

ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517

Product Details

Technical Information:

Hydrophobic, moisture-reactive polyurethane resin Expands up to 20 times its original volume Adjustable with the ACTFLEX PU Accelerator for controlled curing speed Closed-cell, semi-flexible foam resistant to water and chemical degradation Low-viscosity for deep penetration into fine cracks and voids Minimal moisture needed for activation, allowing use in drier conditions High chemical resistance and long-term waterproofing performance Basements, car parks, retaining walls, curtain walls, tunnels, and foundation cracks Applied using a high-pressure injection pump for deep penetration and uniform sealing
Key Benefits:

✔ Hydrophobic formula ensures long-term water resistance

✔ Controllable reaction speed with accelerator liquid

✔ Strong adhesion to concrete and masonry surfaces

✔ Expands effectively to fill cracks and voids completely

✔ Resistant to harsh environmental conditions and chemicals

How to Use

Mix resin and accelerator at 10:1 by weight and inject with single-component, high-pressure polyurethane equipment through 10 mm packers at maximum 200 mm intervalsProbe and assess any void of unknown volume before injecting, and confirm the resin quantity by trial injection on the first section
Drill 10 mm holes at maximum 200 mm intervals along the crack, offset from the crack line and angled at 45 degrees
Drill deep enough to intersect the crack at a depth of 60-100 mm, alternating sides of the crack where access allows
Blow or vacuum all dust from the drilled holes
Insert 10 mm mechanical packers with non-return valves, leaving approximately 20 mm of the packer proud of the surface
Tighten each packer firmly with the T-handle wrench to seal against injection pressure
Where the crack is dry or water content is low, inject clean water through the packers to activate the reaction
Select the accelerator dosage from the reaction data to suit ambient temperature, water flow rate and the required set speed
Confirm all mixing containers, equipment and lines are dry, then flush the pump and lines with urethane thinner before charging
Mix the base resin and accelerator at 10:1 by weight, or at the selected dosage, with a low-speed mixer to a uniform consistency without entraining air
Mix only the quantity that can be injected within the pot life of 20-30 minutes at 25C and 50% RH
Charge the pump, filling approximately two-thirds of the reservoir before sealing the lid
Begin injection at low pressure and increase gradually
Vertical cracks: inject from the bottom packer upward. Horizontal cracks: inject from the ends toward the centre
Continue at each packer until resin extrudes from the crack approximately 100 mm either side of the packer, then move to the next packer
Do not over-inject
Leave the non-return packers in place to hold the resin under pressure while it cures
Trim and dress the cured foam once it is firm and no longer expanding
Allow 24 hours at 25C and 50% RH for full reaction and a stable seal
Remove the packers and patch the drill holes flush with a FORSPEC repair mortar, FORBUILD 100 or FORCRETE 100 per its TDS
Flush the pump and lines with urethane thinner immediately after use, and with cleaning alcohol if mixed material has stood longer than 20-30 minutes
Record batch numbers, injection dates, packer locations and spacing, injection pressures, mix ratios and accelerator dosages in the project quality records

Technical Specifications

Product Type: Two-component hydrophobic polyurethane injection resin for water-stopping and non-structural void filling
Composition: Two-component hydrophobic polyurethane resin, base resin plus accelerator
Mix Ratio, Resin to Accelerator: 10:1 by weight, standard
Colour and Form: Light brown, low-viscosity liquid, mixed
Density at 25C: 1.12-1.20 g/cm3*
Viscosity at 25C, Mixed: 450-600 mPa.s*
Foaming Magnification: Above 15 times, free foam*
Foaming Time at 25C, 50% RH: Approx. 150-600 seconds, accelerator-dependent*
Pot Life, Mixed at 25C, 50% RH: 20-30 minutes*
Bond Strength to Concrete: Greater than 2.28 MPa*
Elongation, Thick Sections: Greater than 100%*
Elongation, Thin Sections: Greater than 250%*
Reaction Time at 25C, 2:1 Resin to Accelerator: 150-200 seconds*
Reaction Time at 25C, 5:1 Resin to Accelerator: 320-340 seconds*
Reaction Time at 25C, 10:1 Standard: 340-360 seconds*
Reaction Time at 25C, 15:1 Resin to Accelerator: 330-370 seconds*
Full Reaction and Stable Seal: 24 hours at 25C, 50% RH*
Application Temperature: Greater than 10C, substrate and material
Packer Spacing: 10 mm holes at maximum 200 mm intervals, angled 45 degrees to intersect the crack at 60-100 mm depth
Packaging: 22 kg set, 20 kg resin plus 2 kg accelerator
Shelf Life: 12 months, unopened, 5-30C, protected from moisture
Hazard Classification: Hazardous Chemical, Non-Dangerous Goods under the WHS Regulations and the ADG Code
* Typical Forspec R&D characteristic values, not subject to third-party certification

Product Files

ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane

$638.00

Frequently bought together

This item

ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane $638.00
Add

125mm Arrow Cup Grinding Disc $100.00
Add

600mm True Blue Digital Level - Empire $175.00
Add

ACTFLEX 101 UV Stable Trafficable Membrane $250.00

System Build-Up Guide

Correct application makes all the difference.

View All Details

Pool System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX FLEXPLUS
4 ACTFLEX HYDROPLUG
5 ACTFLEX AT MESH
6 ACTFLEX 988 CWP (2 Coats)
7 Tile Adhesive
8 Pool Finish

Retaining Wall System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX MS PRO
4 ACTFLEX AT MESH
5 ACTFLEX 988 CWP (2 Coats)
6 Protection Board (Optional)
7 Drainage System
8 Backfill

Tank System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX FLEXPLUS
4 ACTFLEX AT MESH
5 ACTFLEX 988 WMP (2 Coats)
6 Protective Coating (Optional)
7 Water

Technical overview

ACTFLEX PU300 is a two-component, hydrophobic polyurethane injection resin consisting of a base resin and an accelerator, mixed at 10:1 by weight as a 22 kg set of 20 kg resin plus 2 kg accelerator. The separate accelerator component gives precise control of the reaction time, allowing adjustment to site conditions such as ambient temperature, water flow rate and substrate characteristics. On contact with water the mixed resin expands to a rapidly curing, closed-cell hydrophobic foam that seals cracks, construction joints and voids. It is a water-stopping resin, not a structural repair. No Australian Standard specifically governs polyurethane injection resins for water-stopping, so every performance value published here is a Forspec R&D characteristic value on standard production material and is not subject to third-party certification. It is not certified for contact with drinking water under AS/NZS 4020.

Key applications

Sealing active leaks in concrete - ceilings, walls, floors and construction joints
Basements, tunnels, underground structures and retaining walls
Filling voids, cracks and cavities in concrete (non-structural void filling)
Stopping active water leaks in dams, reservoirs, wastewater structures and pipelines
Void filling and stabilisation behind structures, and in soils and rock formations, subject to geotechnical assessment and trial injection
Wet and dry conditions - dry cracks are pre-wetted through the packers before injection

Surface suitability

Concrete ceilings, walls, floors and construction joints
Concrete voids, cracks and cavities (non-structural void filling)
Concrete in flowing-water and high-moisture conditions
Dry concrete cracks pre-wetted through the packers before injection
Soils and rock formations, subject to geotechnical assessment and trial injection
Substrate and material temperature greater than 10C

Pot life is 20-30 minutes once mixed at 25C and 50% RH - mix only the quantity that can be injected within this time. Requires water to foam - dry cracks must be pre-wetted through the packers before injection. Water-stopping and void-filling product only, not a structural repair - use the FORSPEC structural injection range for load-transferring crack repair. Do not apply below 10C substrate or material temperature; cold conditions slow the reaction and reduce expansion. Not certified for contact with drinking water (AS/NZS 4020) - do not use in potable water structures unless confirmed in writing by Forspec. Moisture-sensitive components - the resin reacts with atmospheric humidity; keep containers sealed, and keep equipment and lines dry. Not UV stable - for buried and internal concealed applications, not for exposed finishes. Live movement joints require a purpose-designed movement joint system; injected foam alone must not be relied on across joints subject to ongoing movement. Injection into voids of unknown volume can consume large resin quantities - probe and assess before injecting. Soil and rock stabilisation applications are subject to geotechnical assessment and trial injection. Classified as hazardous - handle with chemical-resistant gloves, safety eyewear, protective clothing and, in areas with limited ventilation, suitable respiratory protection.

Technical Specifications

Product Type	Two-component hydrophobic polyurethane injection resin for water-stopping and non-structural void filling
Composition	Two-component hydrophobic polyurethane resin, base resin plus accelerator
Mix Ratio, Resin to Accelerator	10:1 by weight, standard
Colour and Form	Light brown, low-viscosity liquid, mixed
Density at 25C	1.12-1.20 g/cm3*
Viscosity at 25C, Mixed	450-600 mPa.s*
Foaming Magnification	Above 15 times, free foam*
Foaming Time at 25C, 50% RH	Approx. 150-600 seconds, accelerator-dependent*
Pot Life, Mixed at 25C, 50% RH	20-30 minutes*
Bond Strength to Concrete	Greater than 2.28 MPa*
Elongation, Thick Sections	Greater than 100%*
Elongation, Thin Sections	Greater than 250%*
Reaction Time at 25C, 2	1 Resin to Accelerator: 150-200 seconds*
Reaction Time at 25C, 5	1 Resin to Accelerator: 320-340 seconds*
Reaction Time at 25C, 10	1 Standard: 340-360 seconds*
Reaction Time at 25C, 15	1 Resin to Accelerator: 330-370 seconds*
Full Reaction and Stable Seal	24 hours at 25C, 50% RH*
Application Temperature	Greater than 10C, substrate and material
Packer Spacing	10 mm holes at maximum 200 mm intervals, angled 45 degrees to intersect the crack at 60-100 mm depth
Packaging	22 kg set, 20 kg resin plus 2 kg accelerator
Shelf Life	12 months, unopened, 5-30C, protected from moisture
Hazard Classification	Hazardous Chemical, Non-Dangerous Goods under the WHS Regulations and the ADG Code
* Typical Forspec R&D characteristic values, not subject to third-party certification

Real Projects. Real Results.

View All Projects

Before After
Pool Renovation
Gold Coast, QLD
Before After
Below Ground Retaining Wall
Sydney, NSW
Before After
Concrete Water Tank
Perth, WA
Before After
Commercial Podium
Melbourne, VIC
Before After
Swimming Pool Construction
Brisbane, QLD

Watch the install

Step-by-step from prep to top coat. Filmed on the tools, not in a studio.

The Waterproofing Shop?

We supply premium waterproofing products backed by expert advice, fast service and real-world experience.

100% Australian
Owned & Operated

30+ Years in the
Waterproofing Industry

Thousands of Products
in Stock

Fast Shipping
Australia Wide

Expert Technical
Support

Frequently asked questions

View all FAQs

What is ACTFLEX PU300 used for?

Compatibility
PU300 is a hydrophobic polyurethane crack injection with an adjustable reaction profile - the 2-component design (resin + accelerator) lets you tune the cure speed to match the specific crack and water conditions on site.
How does the adjustable cure work?

Performance
Mix 10:1 base resin to accelerator for controllable cure timing. Foaming time 150-600 seconds depending on accelerator dose. Faster cure for high-flow leaks, slower cure for deep penetration in dry cracks.
Specifications?

Installation
Viscosity 450-600 mPa·s. Bond strength to concrete exceeds 2.28 MPa. Elongation greater than 100% (thick) or 250% (thin film). Density 1.12-1.2 g/cm³. Apply at greater than 10°C ambient.
When should I use PU300 vs PU200?

Compatibility
Use PU300 when you need adjustable cure timing for difficult conditions (heavily wet cracks, deep structural cracks). Use PU200 for standard hydrophobic injection where the fixed cure profile works.
What does the cured foam look like?

Performance
Light brown closed-cell hydrophobic foam. Immediately waterproofs cracks on water contact. 12-month shelf life when stored sealed. Safe for indoor work with appropriate ventilation.

ACTFLEX PU300 22kg Kit Hydrophobic Polyurethane

Technical Information:

Frequently bought together

Pool System Build-Up

Retaining Wall System Build-Up

Tank System Build-Up

Technical overview

Key applications

Surface suitability

Technical Specifications

Pool Renovation

Below Ground Retaining Wall

Concrete Water Tank

Commercial Podium

Swimming Pool Construction

The Waterproofing Shop?

Frequently asked questions

You may also need