SILCOR® 580 is GCP's two-part, low-odour, heavy-duty trafficable polyurethane waterproofing membrane for horizontal substrates set to falls. It is a high-solids, chemically cured Class III membrane designed for demanding exposed and protected waterproofing systems.
For heavy foot and light vehicle traffic, GCP specifies a SILCOR 580 wear coat with broadcast aggregate followed by SILCOR Top Coat 80. The current 580 system guidance calls for a minimum 3.0mm membrane DFT for heavy-foot/light-vehicle areas where a project-specific GCP specification has not stated otherwise.
SILCOR Top Coat 80 is therefore a genuine system component for this 580 build-up rather than a generic top coat for every SILCOR membrane.
At 23°C under GCP's stated test conditions, SILCOR 580 has a working time of about 25 minutes, a minimum recoat time of 15 hours and is ready for flood testing, topping or backfilling after approximately 15 hours. Cure time changes with temperature and site conditions, so use the current GCP table for the job.
For prepared substrates below 5% moisture, current GCP guidance permits SILCOR Primer BS or EPOCOTE F100W Clear, depending on substrate. For prepared concrete and masonry between 5.0% and 6.9% moisture, use EPOCOTE F100W Clear or allow the substrate to dry below 5%.
Choose 580 when traffic demand or fast chemical cure makes the lighter one-part membranes unsuitable. For non-exposed concealed waterproofing, compare SILCOR 560 HB. For horizontal waterproofing without heavy-duty vehicle traffic, compare SILCOR 575 LB.
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Where is SILCOR 580 used?
It is a heavy-duty trafficable membrane for roofs, decks, podiums, car parks, ramps, plant rooms and similar areas.
When can foot traffic return?
After about 8 hours under suitable conditions.
When can vehicles use the surface?
Allow about 5 days cure before vehicle traffic.
What substrate moisture limit is recommended?
Below 5%, unless the specified GCP damp-concrete primer system is used.
| Property | Value |
|---|---|
| Base Chemistry | High solids, 2-part reaction curing polyurethane |
| Mix Ratio By Weight | 100 : 100 w/w |
| Specific Gravity (Mixed Membrane) | 1.23 g/ml |
| Brookfield Viscosity (Mixed Membrane) | 6,500 mPa.s |
| Solid Content | 97 %w/w |
| VOC Content | <35 g/L |
| Working Time (23°C / 60% RH) | 25 minutes |
| Pot Life | 30 minutes |
| Tack Free Time | 4 hours |
| Set Time | 3 hours |
| Min Recoat Time (23°C / 60% RH) | 15 hours |
| Max Recoat Time (23°C / 60% RH) | 36 hours |
| Min Through Cure Time (23°C / 60% RH) | 15 hours |
| Rain Resistant Min Cure Time (23°C / 60% RH) | 15 hours |
| Ready For Flood Testing / Topping / Backfilling (23°C / 60% RH) | 15 hours |
| Shore A Hardness | 80 °A |
| Tensile Strength | >7.0 MPa (AS 4858) / >8.0 MPa (AS 4654.1) |
| Elongation | >500 % (AS 4858) / >700 % (AS 4654.1) |
| Classification | Class III High Extensibility – AS 4858-2004 / AS 4654.1-2012 |
| Movement Capability | Pass – No fatigue cracking exhibited |
| Bond Strength | >7.7 N (AS 4654.1) |
| Water Vapour Transmission | 7.99 g/m²/24h |
| Water Resistance | Pass |
| Chemical Resistance | Pass |
| Resistance To Detergent Immersion | Pass |
| Heat Aging | Pass |
| Service Temperature | -40°C to +100°C |
| Substrate Temperature Range | +5°C to +35°C |
| Ambient Temperature Range | +5°C to +35°C |
| Relative Humidity Range | 35% to 85% |
| Dew Point | Minimum 3°C below substrate temperature |
| Minimum DFT (Non-Traffic / Foot Traffic) | 1.5 mm |
| Minimum DFT (Heavy Foot Traffic / Light Vehicle Traffic) | 3.0 mm |
| Mixing Ratio | 100 : 100 w/w |
| Viscosity | Polyol = 6,000; Iso = 5,000; Mixed Membrane = 6,500 |
| Specific Gravity | Polyol = 1.40; Iso = 1.05; Mixed Membrane = 1.23 |
| Recoat Time | 15 |
| Full Cure | 15 |
Here are some common examples on where SILCOR® 580 used by our customers.
