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Sika SikaSwell S-2 is a hydrophilic waterstop for civil construction and waterproofing. Swells on contact with water to seal concrete construction joints, with permanent resistance through wet and dry cycles.
What is SikaSwell S-2 used for?
SikaSwell S-2 seals concrete construction joints and penetrations. It also bonds SikaSwell A and P Profiles to prepared concrete, and both uses rely on the same mechanism: contact with water makes the sealant swell and close the gap against water ingress.
How much does SikaSwell S-2 swell?
In tap water, volume change is less than 25% after 1 day and less than 100% after 7 days. Swelling in salty water is reduced and delayed compared with tap water.
Can SikaSwell S-2 be used for movement joints?
No. SikaSwell S-2 is excluded from movement-joint applications. Its documented uses are construction joints, concrete penetrations, and fixing SikaSwell A and P Profiles.
What water pressure can SikaSwell S-2 seal against?
SikaSwell S-2 is recommended for water pressures up to 2 bar. Above 2 bar, use it only as a supplementary joint sealing solution.
How long should SikaSwell S-2 cure before concrete is placed?
Allow at least 24 hours before placing concrete when bonding a SikaSwell profile. For pours above 50 cm, allow at least 3 days. Keep the sealant dry until the concrete is placed.
- Existing concrete: Sound, clean, and dry or matt damp. Remove loose particles, release agents, laitance, paint, rust, and other poorly adhering material.
- Freshly cast concrete: Smooth the placement area with a batten; excessively rough surfaces can be susceptible to leaking.
- Primer: Not required on concrete per the Product Data Sheet.
- Placement: Centre the sealant in the structure with the specified concrete cover on both sides.
Sika SikaSwell S-2 Physical Properties
| Property | Value |
|---|---|
| Composition | 1-part polyurethane, moisture curing |
| Colour | Oxide red |
| Packaging | 300 ml cartridges, 12 cartridges per box; 600 ml unipacs, 20 unipacs per box |
| Shelf Life | 9 months from date of production |
| Storage Temperature | +5 °C to +25 °C |
| Density | 1.24 kg/L at +23 °C |
| Shore A Hardness | 30–50, non-swollen after 7 days at +23 °C and 50% r.h. |
| Change Of Volume | <25% after 1 day in tap water, <100% after 7 days in tap water |
| Sag Flow | <2 mm at +23 °C and 50% r.h. |
| Substrate Moisture | Dry or matt damp |
| Curing Rate | ~2.0 mm after 1 day, ~10.0 mm after 10 days at +23 °C and 50% r.h. |
| Skinning Time | 60 minutes at +23 °C and 50% r.h. |
| Profile Placement Window | Maximum 30 minutes |
| Ambient Application Temperature | +5 °C to +35 °C |
| Substrate Application Temperature | +5 °C to +35 °C |
| Recommended Water Pressure | Up to 2 bar |
| Minimum Cover Reinforced Concrete | 8 cm on both sides |
| Minimum Cover Unreinforced Concrete | 15 cm on both sides |
| 12 mm Bead Yield | 4.1 m per 300 ml cartridge, 8.2 m per 600 ml unipac |
| 15 mm Bead Yield | 3.1 m per 300 ml cartridge, 6.2 m per 600 ml unipac |
| 20 mm Bead Yield | 1.8 m per 300 ml cartridge, 3.6 m per 600 ml unipac |