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Protect exposed concrete against water and chloride ingress without sealing in water vapour. Sikagard®-705 L is a ready-to-use, deeply penetrating silane treatment that makes absorbent concrete water repellent while maintaining its ability to breathe.
Key benefits
- Penetrating protection: reduces capillary water uptake rather than leaving a surface membrane.
- Chloride resistance: helps limit the ingress of chloride-bearing water in exposed structures.
- Vapour permeable: allows water vapour to pass through treated concrete.
- High-active formulation: contains 99% active ingredient and offers EN 1504-2 Class II penetration under specified test conditions.
Typical applications
Suitable for specified building, civil and marine concrete exposed to rainfall, splash water and aggressive chloride environments. Apply undiluted to clean, absorbent surfaces by low-pressure spray, brush or roller, using the coverage and coat count specified for the project.
Important to know
This is a penetrating water-repellent treatment, not a crack-bridging waterproofing membrane. Confirm substrate condition, application rates and any overcoating requirements against the current technical data sheet.
Hydrophobic treatment for suitable concrete and cementitious substrates.
Reduces capillary water uptake and associated chloride ingress.
Maintains water-vapour permeability.
Prepare a clean, absorbent substrate and check its moisture against the specified limits. Use ready to use; do not dilute. Apply by low-pressure spray, roller or brush, working from the bottom up on vertical surfaces and avoiding runs or ponding. Subsequent coats may be applied wet-on-wet or after drying, in accordance with the planned 2–3 coat system. Allow the appropriate waiting interval before any compatible protective coating.
Not a film-forming or crack-bridging waterproofing membrane. Do not dilute. Avoid application on excessively damp surfaces, outside the published temperature limits or when the substrate is too close to dew point. Confirm penetration and compatibility with any overcoat; an overcoating window of approximately 5 hours to 1 week is stated for approved systems.
- Sound, absorbent concrete
- Suitable porous cementitious substrates
- Approved civil or structural concrete surfaces subject to a protection specification
Sikagard®-705 L Physical Properties
| Property | Value |
|---|---|
| Chemical base | Alkoxy silanes (99% active ingredient) |
| Appearance | Colourless, water-like liquid |
| Density | Approximately 0.900 kg/L at 25°C |
| Viscosity | Approximately 9 mm²/s at 25°C |
| Penetration depth | >10 mm; EN 1504-2 Class II |
| Indicative consumption | Approximately 150 g/m² per coat |
| Coats | 2–3 depending on system and substrate |
| Ambient application temperature | +5°C to +35°C |
| Substrate application temperature | +5°C to +40°C |
| Substrate moisture | Less than approximately 5–6% by Tramex |
| Overcoating interval | 5 h to 1 week, subject to chosen coating system |
| Shelf Life | 24 months in sealed original packaging |
| Packaging | 18 kg pail |