For below-ground tanking, covered external decks, and internal wet areas, SILCOR 560 HB LVOC is a one-part, grey polyurethane membrane that cures to form a seamless, elastomeric barrier. It is tested to AS4654.1 for external waterproofing and compliant to AS4858:2004 for internal wet areas when applied in accordance with AS3740:2010.
The liquid-applied polyurethane chemistry cures via ambient humidity to form a fully bonded, monolithic membrane. Because it bonds directly to the prepared substrate, it prevents water from tracking underneath the barrier in the event of a localized puncture. The elastomeric structure achieves Class III cyclic crack bridging, allowing it to span non-structural concrete shrinkage cracks and tolerate normal structural movement without cracking. Formulated free of bitumen and tar, the membrane will not bleed or stain adjacent finishes.
This membrane is suitable for application on cured, stable, and primed concrete, blockwork, brick, cementitious screed, render, water-resistant timber, plywood, particle board, compressed fibre cement sheet (CFC), cement composite sheet (CCS), glass reinforced concrete (GRC), rendered aerated autoclaved concrete (AAC), and metals. Common structural jobs include:
All substrates must be clean, dry, and free of laitance, curing compounds, and contaminants. Priming requirements vary by substrate condition and type:
A complete waterproofing system requires specific detailing components prior to membrane application:
No, SILCOR 560 HB LVOC is not UV stable. It must be protected from direct or indirect UV exposure within 14 days of application, typically by surfacing or a suitable top coat like SILCOR Top Coat 75.
SILCOR 560 HB LVOC is a certified Class III membrane compliant with AS4858:2004 for wet areas. It also meets AS3740:2010 for internal wet areas and AS4654.1 for external waterproofing under the NCC.
Yes, it is formulated for external below-ground applications such as lift pit walls, retaining walls, and basement walls. Its fully bonded, seamless application prevents water tracking.
Where not specified by project documentation, a minimum dry film thickness (DFT) of 1.5mm in two coats is required for continuous membrane application. Always test wet film thickness during application.
Higher temperatures and humidity accelerate cure, while lower conditions significantly extend it. Humidity below 25% RH can prevent the product from curing correctly, making application windows critical.
| Application | Key benefit | Primary trades |
|---|---|---|
| External below ground (tanking) for basement walls, lift pits, retaining walls | Fully bonded and seamless application prevents water tracking behind the membrane, resistant to non-aggressive root systems. | Waterproofers, Civil contractors |
| External above ground (non-exposed/covered) for balconies, podiums, planter boxes | AS 4654-2012 compliant, flexible elastomeric membrane handles structural movement and bridges non-structural concrete shrinkage cracks. | Waterproofers, Builders |
| Internal wet areas like bathroom floors, shower trays, laundries | AS 3740-2010 compliant, one-part system simplifies application, very low VOC for improved site environment. | Tilers, Waterproofers |
| Non-potable water storage tanks | Seamless and bio-resistant membrane ensures long-term integrity without bitumen bleed or staining. | Tank manufacturers, Civil contractors |
| Detailing and joint sealing in high movement areas | Used with SILCOR LM PU Sealant, accommodates movement and maintains membrane integrity without full reinforcing. | Waterproofers, Concrete repairers |
Danger
Wear protective gloves (nitrile rubber), protective clothing, safety glasses with side shield protection, face protection, and hearing protection. If exposure limits are exceeded, use approved respiratory protective equipment.
Ensure adequate ventilation, especially at floor level, as fumes are heavier than air. Use only outdoors or in a well-ventilated area.
Store in original, unopened packaging between 15°C and 25°C, under cover, protected from heat, ignition, moisture, frost, and direct sunlight. Keep containers tightly sealed and cool in a dry, well-ventilated place. Dispose of contents and container according to local regulations; do not allow product to reach sewage systems.
Proper substrate preparation and priming are critical for the long-term performance and adhesion of the waterproofing membrane. Follow these guidelines to ensure a robust bond.
Surface prep: Ensure concrete is well compacted and moist-cured as per AS 3600. It must be a minimum of 14-28 days old. Concrete compressive strength must be at least 25 MPa, with a surface pull-off strength of 1.0 MPa (non-trafficable) or 1.5 MPa (trafficable). Finishes should be steel trowel, light power float, or off-form, avoiding porous, tamped, or broom finishes. Remove all laitance, curing compounds, and contaminants.
Primer: Required. Use SILCOR Primer BS, SILCOR Primer BW Clear, or SILCOR Primer BW Grey depending on moisture content (<5% or <10%). Apply at a minimum rate of 0.3kg/m².
Surface prep: Sheets must be installed to manufacturer’s requirements, clean, dry, and free of all surface sealers, coatings, and acrylic primers. For CCS, careful preparation is vital due to its laminar structure and low internal strength.
Primer: Required. For CFC, use SILCOR Primer BS, SILCOR Primer BW Clear, or SILCOR Primer BW Grey. For CCS, use only SILCOR Primer BS at a minimum 0.3kg/m², often requiring two or more applications for penetration and consolidation.
Surface prep: Remove all dirt, dust, oil, grease, corrosion, and oxides. Roughen the surface by abrasion or garnet blasting to SA 2.5 (near white metal). Solvent wipe with MULTITEK Xylene or MEK before priming.
Primer: Required. Prime within 30 minutes of preparation to minimise oxidation. For difficult-to-prime metals like stainless steel, a silane coupling agent (e.g., Dow Corning DC1200 OS) may be required.
Surface prep: The AAC surface must be rendered to seal and provide a strong, smooth finish. Allow the render to dry to a moisture content below the maximum allowable for the chosen primer.
Primer: Required. Select the appropriate SILCOR primer based on moisture content, as for concrete.
| Property | Value |
|---|---|
| Membrane Chemistry | High solids polyurethane |
| Appearance | Grey viscous liquid |
| Specific Gravity | 1.48 ±0.03 g/ml |
| Viscosity Brookfield LV Spindle 4/6 rpm | 60,000 ±10,000 mPa.s |
| Solids Content | 91 ±3 %w/w |
| Tack Free Time | 4 hours |
| Gel Time | 6 hours |
| Min Recoat Time | 12 hours |
| Max Recoat Time | 48 hours |
| Min Cure Time – Ready for Flood Testing, Topping, Backfilling | 48 hours |
| Shore A Hardness | 55 ±5 °A |
| Tensile Strength | > 2.0 MPa |
| Elongation | > 550 % |
| Tear Strength | > 13.0 N/mm |
| Adhesion to Primed Concrete | > 1.5 MPa |
| Cyclic Crack Bridging | Pass – Class III |
| Root Resistance | Resistant to nonaggressive root systems |
| Bio Resistance | Resistant to microbial degradation |
| Initial Boiling Point and Boiling Range | >138 °C |
| Flashpoint | >72 °C |
| Density at 20 C | 1.5 g/cm³ |
| Solubility in Water | Not miscible or difficult to mix |
Here are some common examples on where Silcor 560 HB Low VOC Membrane used by our customers.
