Sika® FerroGard®-903+

• BRE: The use of surface applied FerroGard 903+ corrosion inhibitor to delay the onset of chloride induced corrosion in hardened concrete, BRE Client Report No. 224-346, 2005.
• Mott MacDonald: Evaluation of Sika FerroGard 901 and 903+ Corrosion Inhibitors, Ref. 26’063/001 Rev A, April 1996.
• SAMARIS (Sustainable and Advanced Materials for Road Infrastructure): Final Report, Deliverables D17a, D17b, D21 & D25a, Copenhagen, 2006.
• Mulheron, M., Nwaubani, S.O.: Corrosion Inhibitors for High Performance Reinforced Concrete Structures, University of Surrey, 1999.
• C-Probe Systems Ltd.: Performance of Corrosion Inhibitors in Practice, 2000.

Aqueous solution of amino alcohols and salts of amino alcohols.

24 months from date of production if stored properly in undamaged and unopened, original sealed packaging.

Store in a cool environment. In case of frost (i.e. < -5°C), reversible crystallisation may occur. If this happens, let the product warm up at room temperature (+15 to +25 °C), then stir well to redissolve / redisperse the crystals.

~1.04 kg/L (at +20°C)

~10

~24 mPa·s

Sika® FerroGard®-903+ is part of the Sika® Concrete Repair and Protection Systems:  

Site surveys and experimental tests have shown that Sika® FerroGard®-903+ can penetrate through concrete at a rate of a few millimetres per day and to a depth of approximately 25 to 40 mm in 1 month. This penetration rate can be faster or slower dependent on the porosity of the concrete. Sika® FerroGard®-903+ penetrates through both liquid and vapour phase diffusion mechanisms.
NOTE:
If, after application of Sika® FerroGard®-903+, the concrete surface is coated with protective coatings (cement based, acrylic or impregnation) or hydrophobic impregnation, the rate of diffusion of the inhibitor is reduced but not stopped as the mechanism of diffusion continues in the vapour phase.
As concrete quality and permeability differ, it is recommended to perform some preliminary depth profile testing by the Sika® 'Qualitative Analysis' to assess the specific penetration rate.

+5°C minimum / +40°C maximum

+5°C minimum / +40°C maximum

Waiting time between coats:
This is dependent on the porosity of the concrete and the weather conditions, but is normally 1 to 6 hours. Allow the surface to dry out between coats to a matt damp appearance.
Overcoating:
If the application is carried out as described above, no further treatment is required before overcoating with Sikagard® hydrophobic impregnations, Sikagard® breathable coatings, or Sikafloor® products (refer to appropriate Product Data Sheet for application details).
If non-Sika® coatings are to be applied, please contact the manufacturers' technical department for confirmation of compatibility with Sika® FerroGard®-903+, or undertake compatibility and adhesion site trials.
When Sika® FerroGard®-903+ is used within a patch repair or before a cementitious overlay. Standard preparation (pre-wetting) shall be applied.
When using a smoothing coat / pore filler over surfaces treated with Sika® FerroGard®-903+, products such as Sikagard®-720 EpoCem® or Sika® MonoTop®-3020, etc., can be used. Cementitious levelling mortars shall only be used if there is a well prepared open textured surface, that is completely cleaned of residue to achieve the required adhesion value.
If other Sika® products are to be used, site trials are recommended to confirm preparation and suitability.
If non-Sika® products are to be used, please contact the manufacturers' technical department for confirmation of compatibility with Sika® FerroGard®-903+ or undertake compatibility and adhesion site trials.

Generally ~0.500 kg/m² (~480ml/m²).
For very dense concrete with low permeability, the rate of application of Sika® FerroGard®-903+ can be reduced, but must not be lower than ~0.300 kg/m² (~290ml/m²).
To assess project requirements, consumption and depth of penetration shall be checked on site using the Sika® 'Qualitative Analysis' Test.

The concrete shall be free from dust, loose material, surface contamination, existing renders, laitance, coatings, oil and other materials which reduce or prevent penetration.
If the substrate is to be overcoated, the surface profile shall be sufficient to provide the required adhesion.

Delaminated, weak, damaged and deteriorated concrete shall be repaired using Sika® MonoTop® mortars.
For fair-faced concrete, or concrete to be further overcoated by coatings or hydrophobic impregnation, waterblast the concrete surface with pressure (up to 18 MPa / 180 bars).
For concrete surfaces to be further overcoated by cementitious material, roughen the surface using suitable abrasive blast cleaning techniques or high pressure waterblasting (up to 60 MPa / 600 bars).
For optimum penetration, the substrate shall be allowed to dry out prior to the application of Sika® FerroGard®-903+.

Sika® FerroGard®-903+ is supplied ready for use and must not be diluted. Do not shake the material prior to use.

Sika® FerroGard®-903+ shall be applied to saturation by brush, roller, low pressure or airless spray equipment.

Number of Coats:
This is dependent on the porosity and moisture content of the substrate, and the weather conditions.
Vertical Surfaces:
Normally, 2 to 3 coats are necessary to achieve the required consumption. In case of dense concrete, additional coats may be required.
Horizontal Surfaces:
Saturate surface with 1 to 2 coats, taking care to avoid ponding.
Waiting Time Between Coats:
This is dependent on the porosity of the concrete and the weather conditions, but is normally 1 to 6 hours. Allow the surface to dry out between coats to a matt damp appearance.
After the application of the last coat, as soon as the surface becomes matt, clean the surface using low pressure water (water hose).
The day after application, the treated surfaces shall be cleaned by pressure washing (~10 MPa / 100 bars).

Sika® FerroGard®-903+ does not require any special curing but must be protected from rain for at least 4 hours.

Use water to clean application equipment.