Sika Sikagard 705 L
Sika Sikagard 705 L
Sikagard®-705 L is a one-component, low viscosity, solvent-free transparent silane penetrating passive corrosion inhibitor / hydrophobic impregnation with 99% active ingredient content. Designed for reinforced concrete and cementitious substrates, it achieves penetration depth exceeding 10 mm (EN 1504-2 Class II), effectively reducing chloride ion ingress and reinforcement corrosion while maintaining vapour permeability. Consumption approx. 150 g/m² per coat, applied in 2–3 coats.
Product Overview
Sikagard®-705 L is a one-component, low viscosity, solvent-free transparent hydrophobic impregnation based on alkoxy silanes with 99% active ingredient content. The product complies with the highest requirements of EN 1504-2 for hydrophobic impregnation (penetration depth Class II, >10 mm) and provides resistance to freeze/thaw cycles and de-icing salt attack. Suitable for concrete structures exposed to severe environments, it penetrates deep into the substrate to form a lasting hydrophobic protective layer, effectively reducing capillary water absorption, chloride ion diffusion and reinforcement corrosion.
Key Features
- 99% active silane content with excellent penetration — depth exceeding 10 mm
- Fast uptake even on dense concrete
- Ready to use — no dilution required, easy application
- Significantly reduces capillary water absorption, protects against rain and splashing
- Effectively reduces absorption of chloride ions, de-icing salts and other harmful agents
- Enhances concrete resistance to freeze/thaw and salt attack (EN 13581 compliant)
- Reduces reinforcement corrosion, effective even in cracked concrete
- Maintains water vapour permeability — no vapour barrier formed
- Transparent, colourless water-like liquid — no change in appearance after treatment
- Solvent-free formula with excellent alkali resistance
- Effective against AAR (Alkali Aggregate Reaction)
- Reduced green growth
Applications
- Car parks, bridge decks and highway concrete surface waterproofing
- Marine structures (jetties, breakwaters, etc.) — chloride ingress protection
- Slopes, barriers, cooling towers, stadiums and other structural protection
- Concrete structures exposed to freeze/thaw cycles and de-icing salt attack
- Natural stone and other absorbent cementitious substrates
- Passive corrosion protection for new and corroding reinforced concrete structures
Why Choose Sikagard 705 L
Sikagard®-705 L, with its 99% active silane base, achieves penetration depths far exceeding standard hydrophobic products, making it the professional choice for protecting concrete structures in severe environments. Certified to multiple international standards (EN 1504-2 Class II, CE marked), it provides both hydrophobic protection and passive corrosion inhibition — effective even in cracked concrete. The solvent-free, ready-to-use formula greatly simplifies the application process.
Packaging
18 kg pail, 180 kg drum
Consumption Guide
| Item | Value |
|---|---|
| Consumption per coat | Approx. 150 g/m² |
| Recommended coats | 2–3 coats (depending on requirements) |
| Total consumption reference | Approx. 300–450 g/m² |
Actual consumption depends on substrate absorbency and required penetration depth. A preliminary test is recommended. For marine structures (e.g. jetties), a minimum penetration depth of 5 mm is recommended.
Technical Specifications
| Property | Value |
|---|---|
| Chemical Base | Alkoxy silanes (99% active ingredient) |
| Appearance | Transparent, colourless water-like liquid |
| Density | Approx. 0.900 kg/L (at +25°C) |
| Viscosity | Approx. 9 mm²/s (at 25°C) |
| Penetration Depth | >10 mm (EN 1504-2 Class II) |
| Ambient Air Temperature | +5°C to +35°C |
| Substrate Temperature | +5°C to +40°C |
| Substrate Moisture Content | <5–6% (Tramex measurement) |
| Dew Point Requirement | Substrate temperature must be at least 3°C above dew point |
| Overcoating Wait Time | Minimum 5 hours, maximum 1 week |
| Freeze Thaw De-Icing Salt Resistance | Compliant (EN 13581) |
| Resistance to Alkalinity | Compliant (EN 13580) |
| VOC Content | Approx. 327 g/L (ASTM D 3960) |
| Shelf Life | 24 months (unopened, original sealed packaging, dry and cool storage) |
Important Notes
- Best results achieved on concrete aged 28 days; precast elements can be treated as early as 24 hours due to high alkali resistance (penetration depth may be reduced)
- Substrate moisture content must be below 5–6%, surface dry with no damp patches
- Cannot be overcoated with limewash or cement paint
- May damage some coatings and bituminous products
- Application on damp concrete may cause surface darkening — test on a sample area first
- Unpainted window frames and similar elements must be covered and protected from contact
- Cracks wider than 750 μm must be repaired first; cracks 300–750 μm can be treated with increased consumption
FAQ
What is the difference between Sikagard 705 L and Sikagard 703 W?
Sikagard®-705 L is a 99% active silane, solvent-free formula with penetration depth exceeding 10 mm, providing both hydrophobic and passive corrosion inhibition functions — suitable for reinforced concrete in severe environments. Sikagard®-703 W is a silane/siloxane emulsion product primarily for general facade waterproofing. The two serve different purposes; 705 L is for structural applications requiring deep protection and corrosion inhibition.
What is the consumption rate for Sikagard 705 L?
Approximately 150 g/m² per coat, typically applied in 2–3 coats for a total consumption of about 300–450 g/m². Actual consumption depends on substrate absorbency and required penetration depth. A small-area trial is recommended.
Can Sikagard 705 L be used on marine structures?
Yes. Sikagard®-705 L provides excellent resistance to seawater chloride ion ingress and is suitable for marine structures such as jetties and breakwaters. For marine structures and AAR mitigation, a minimum penetration depth of 5 mm is recommended.
