Stretches over 500% before it breaks
517% elongation at break in AS 1145.3 testing. It also passed 50 cycles of 4 mm movement, and still stretched 558% after 56 days under water.
ACTFLEX 906 WPU Water-Based Polyurethane
One membrane for bathrooms, balconies and podiums. Class III on both standards, water based, tile from 24 hours.
ACTFLEX 906 WPU is a single-pack, water-based polyurethane membrane for wet areas under tiles and screeds. It is tested Class III to both AS/NZS 4858 and AS 4654.1, so the same pail covers your internal and protected external jobs. Roll it on, recoat in 6 to 8 hours, tile the next day.
Where to use it
- Bathrooms, showers and laundries under tiles or screed (AS 3740)
- Protected balconies, podiums and rooftops under tiles, screed or pedestal pavers (AS 4654.2)
- Parapets and façades under cladding or render
- Walls and floors on primed concrete, masonry, render, screed and wet-area fibre cement
Why waterproofers buy it
- Class III on both standards, NATA tested, over 500% elongation
- Tile straight onto it. ACTFLEX BIOSET is the tested adhesive for the full system
- Water based, 35 g/L VOC. No solvents to manage in closed rooms
- Non-slump. Builds evenly on walls without running
- Fast programme: recoat 6 to 8 hours, tile or screed from 24 hours, flood test from 72 hours
- Single pack. Open, stir, roll. Tools wash up in water
- 10 year Forspec product warranty
Coverage
20 kg pail: 8 to 10 m² at 1.2 mm DFT, two coats.
5 kg pail: 2 to 2.5 m².
Not for
Permanent sun exposure, pools, ponds, planter boxes, negative pressure, or as a walk-on wearing surface.
All times at 25°C and 50% RH.
Class III under both AS/NZS 4858 and AS 4654.1, with NATA-accredited reports
Direct-stick tiling with ACTFLEX BIOSET as a system tested to AS ISO 13007.5
Water-based, low-VOC at 35 g/L, single component and ready to use
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Technical overview
- ACTFLEX 906 WPU is a single-component, water-based polyurethane-modified Class III waterproofing membrane for internal wet areas and protected external applications beneath tiles, screeds, cladding and pedestal-paver systems.
- It is independently tested Class III under both AS/NZS 4858:2004 (XTecGen Report 251-5) and AS 4654.1:2012 as a material assessment (XTecGen Report 251-3), with 517% control elongation and cyclic movement, immersion and heat-ageing passes on both reports.
- Testing was carried out by XTec Gen Pty Ltd with NATA-accredited results.
- Tiles bond direct to the cured membrane with ACTFLEX BIOSET as a system tested to AS ISO 13007.5.
- Water-based and low-VOC at 35 g/L.
- Internal wet areas are designed and installed to AS 3740:2021; external use is limited to protected, non-exposed applications within an approved fully bonded system to AS 4654.2.
Key applications
- Internal wet areas - bathrooms, showers, laundries - beneath approved tiled or screeded finishes, per AS 3740
- Protected, non-exposed external above-ground areas within an approved fully bonded waterproofing system, per AS 4654.2
- Protected podium slabs beneath approved finishes and pedestal-supported paver systems
- Protected facade and parapet applications beneath approved cladding, render or another compatible protective finish
- Protected rooftop applications beneath an approved finish or protective system
- Horizontal and vertical application on prepared and primed concrete, masonry, cured renders and screeds, and wet-area-grade fibre cement sheeting
Surface suitability
- Concrete (structurally sound, normally at least 28 days old, mechanically prepared to a clean open texture, moisture reading below 4.5%)
- Masonry and blockwork (prepared, clean, dry and free of bond-inhibiting contaminants)
- Cementitious renders and screeds (fully cured)
- Wet-area-grade fibre cement wall sheeting (installed per the sheet manufacturer and the applicable Australian Standard)
- Approved compressed fibre cement flooring
- Dense, smooth or non-porous substrates (compatibility confirmation and ACTFLEX 500 NP PRIMER required)
Not for permanent exposure to direct sunlight - cover with the approved finish or protective system after full cure, or topcoat with ACTFLEX 101 UV where UV exposure remains, including UV-exposed pedestal systems. Not for planter boxes, swimming pools, ponds, tanks or other continuously immersed applications, or where continuous or repeated chlorine exposure is expected. Not a vapour barrier - do not use where the membrane will be exposed to negative hydrostatic pressure. Not an exposed trafficable wearing surface; light foot traffic after full cure for inspection and installation access only. Do not apply over bituminous material, silicone contamination or incompatible sealants and coatings. Do not apply over particleboard, platform or yellow-tongue flooring, chipboard, asbestos-containing materials, timber or unverified proprietary sheet products. Do not bridge active cracks or movement joints with continuous membrane. Do not apply where the quantitative concrete moisture reading is 4.5% or higher without the two-coat ACTFLEX EP250 moisture-control system. Apply only between 10-26C ambient and substrate. Do not dilute. Not approved for potable-water contact.
Shipping and returns
Dispatched same or next business day from Roselands NSW, with fast delivery Australia wide. 7-day returns on unused stock in original packaging (20% restocking fee).
Why waterproofers use ACTFLEX 906
Every figure here comes from the technical data sheet.
Class III, inside and out
Tested Class III to AS/NZS 4858 for wet areas and AS 4654.1 for protected external areas like balconies. Outside, keep it covered with an approved finish.
Same 1.2 mm on walls and floors
Two coats of about 0.6 mm each, the second rolled at right angles to the first. The non-slump body builds evenly on vertical faces too.
Tile straight onto it
Tested as one system with ACTFLEX BIOSET: 1.128 MPa bond, and 1.293 MPa after heat ageing. The pass mark is 0.5 MPa.
Tile from 24 hours
Recoat in 6 to 8 hours. Tile or screed 24 hours after the last coat. Flood test from 72 hours. Times at 25°C and 50% RH, so allow longer when it is cool or humid.
Why waterproofers use ACTFLEX 906
01
Class III under both AS/NZS 4858 and AS 4654.1, with NATA-accredited reports
02
Direct-stick tiling with ACTFLEX BIOSET as a system tested to AS ISO 13007.5
03
Water-based, low-VOC at 35 g/L, single component and ready to use
How to apply ACTFLEX 906
Step by step from the technical data sheet. Always read the full TDS before you start.
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1
Confirm every substrate is approved, structurally sound, correctly installed and suitable for the specified system - application constitutes acceptance of the substrate
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2
Clean the substrate to a dry, open texture free from laitance, dust, loose material, oil, grease, wax, mould, curing compounds, release agents, coatings, adhesives, rust and efflorescence
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3
Mechanically prepare concrete by grinding or shot-blasting to a clean, open texture and remove all dust by industrial vacuum
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4
Reinstate damaged concrete, voids, blowholes and spalls with FORBUILD 100 or FORCRETE 100, finished flush and cured before priming
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5
Remove high points, sharp projections and protrusions that could damage the membrane
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6
Confirm falls - minimum 1:80 and maximum 1:50 to the floor waste internally, minimum 1:100 in protected external areas
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7
Test clean bare concrete with a calibrated quantitative moisture meter and record every reading; the substrate must read below 4.5% or take the two-coat ACTFLEX EP250 moisture-control system
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8
Prime with ACTFLEX 200 on internal porous substrates, ACTFLEX 500 NP PRIMER on approved dense or non-porous substrates, or ACTFLEX EP250 where epoxy priming or moisture control is specified
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9
Allow the primer to reach the condition its TDS requires, inspect for full coverage, and lightly abrade or clean where necessary
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10
Treat static cracks under 2 mm with the approved crack repair method and centre ACTFLEX SA TAPE over the crack, ends overlapped a minimum of 50 mm
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11
Repair static cracks 2 mm and over with ACTFLEX MS PRO and the approved bond-breaker detail
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12
Detail junctions, fillets and penetrations - ACTFLEX SA TAPE within the first wet coat, or a continuous ACTFLEX MS PRO fillet at nominal 12 mm internally and 15 mm x 15 mm in protected external work
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13
Seal pipes, penetrations, puddle flanges and drainage outlets with the primer, sealant, reinforcement and membrane detail together
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14
Mix at low speed until uniform and free from settled material, scraping the sides and base of the pail, without whipping air in and without diluting
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15
Apply by brush or roller in a minimum of two uniform coats, approx. 0.9 mm wet film each, to a minimum 1.2 mm total dry film thickness, each coat at right angles to the last
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16
Check wet film with a gauge on every coat and never exceed 1.5 mm WFT in a single pass
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17
Recoat after 6-8 hours at 25C, 50% RH once the preceding coat is completely dry, and within a maximum of 48 hours
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18
Protect the membrane from water, contamination, sharp objects, construction traffic and premature loading throughout curing
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19
Allow nominally 72 hours full cure after the final coat, then flood test to a minimum depth of 50 mm at the highest point for 24 hours
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Tile direct to the membrane with ACTFLEX BIOSET, or install a screed, from 24 hours after the final coat
Specifications
Every figure from the technical data sheet, in one table.
Property
Value
Membrane Classification
Class III (AS/NZS 4858:2004, XTecGen Report 251-5; AS 4654.1:2012 material assessment, XTecGen Report 251-3)
Solids Content
73% +/- 2% by mass
Control Tensile Strength
4.26 MPa (AS/NZS 4858, Report 251-5); 3.54 MPa (AS 4654.1, Report 251-3)
Viscosity
12,000-15,000 cSt
Product Form
Single-component, grey, non-slump paste
Chemical Base
Water-based polyurethane-modified polymer
Cure Mechanism
Water evaporation
Packaging
5 kg and 20 kg pails, supplied by mass
Relative Density
1.35-1.50
pH
8.2-9.8
Control Elongation at Break
517% (AS/NZS 4858, Report 251-5); 518% (AS 4654.1, Report 251-3)
Cyclic Movement
Pass, no failure, 50 cycles at 4 mm - both standards
Water-Immersion Elongation (56 days)
558% pass (Report 251-5); 561% pass (Report 251-3)
Detergent-Immersion Elongation (56 days)
510% pass (Report 251-5); 341% pass (Report 251-3)
Heat-Ageing Elongation
300% pass (Report 251-5); 739% pass (Report 251-3)
Bond/Peel Force
30.37 N average on EP250-primed concrete, predominantly substrate failure (ASTM C794, Report 251-3)
Water Vapour Transmission
7.76 g/m2/24 h (ASTM E96 desiccant)
Water Absorption
4.35% (AS 3558.1, modified specimen)
VOC Content
35 g/L (ASTM D3960 / ASTM D2369)
System with ACTFLEX BIOSET
Pass initial and heat-aged tensile adhesion, water impermeability at 1.5 bar (AS ISO 13007.5, XTecGen Report 569-2)
Tack-Free Time
6 hours @ 25C, 50% RH
Recoat Time
6-8 hours @ 25C, 50% RH well ventilated, preceding coat completely dry - maximum 48 hours
Tiling
From 24 hours after the final coat
Screeding
From 24 hours after the final coat
Flood Testing
From 72 hours after the final coat
Full Cure
Nominally 72 hours after the final coat @ 25C, 50% RH
Total Dry Film Thickness
Minimum 1.2 mm, minimum two coats, approx. 0.6 mm DFT per coat
Maximum Wet Film Per Pass
1.5 mm
Application Temperature
10-26C ambient and substrate
Consumption
2.0-2.5 kg/m2 at the minimum 1.2 mm total DFT
Shelf Life
12 months unopened, stored as specified
Hazard Classification
Hazardous chemical, non-dangerous goods for transport
Watch the install
See how it goes on, step by step. Always read the full TDS before you start.
Customer reviews
Common questions
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Where is ACTFLEX 906 WPU used?
906 WPU is used in internal wet areas (bathrooms, laundries, ensuites), external balconies, podiums, and rooftops under tiles or screed. Class III certified for both internal and external use.
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What's the coverage and DFT?
Coverage is 8-10 m² per 15L pail at 1.2mm DFT in a two-coat application. Achieves over 500% elongation, fully waterproof 72 hours after the final coat.
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How is 906 WPU applied?
Single-component, ready-to-use - no mixing required. Apply two coats at 90 degrees to each other over a primed substrate using brush or roller. Recoat after 6 hours at 25°C/50% RH; full cure in 3 days.
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Standards compliance?
906 WPU is certified to AS3740:2021, AS/NZS 4858, and AS4654.1:2012 - Class III (non-vapour-barrier). Compliant for both internal wet area and external above-ground applications.
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Is it low VOC and indoor-safe?
Yes. 906 WPU is a water-based polyurethane with low VOC content, making it suitable for occupied buildings and indoor wet-area applications. 12-month shelf life when stored sealed.
Ready to order?
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Dispatched same or next business day from Roselands NSW. Questions? Call the team on (02) 8021 3517.