Product Data Sheet
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Sika® FerroGard®-903 Plus FD

Active corrosion inhibitor for reinforced concrete

Sika® FerroGard®-903 Plus FD is a surface applied active corrosion inhibitor, based on organic compounds, designed for use as an impregnation of steel reinforced concrete. It penetrates the concrete and forms a protective monomolecular layer on the surface of the reinforcing steel. Sika® FerroGard®-903 Plus FD both delays the start of corrosion and reduces the corrosion rate. Corrosion protection with Sika® FerroGard®-903 Plus FD increases the service and maintenance life cycles by up to 15 years when used as a part of a complete Sika Concrete Repair and Protection System.

  • Suitable for method 11.3 (applying inhibitor to the concrete) defined by EN 1504-9 for Principle 11 (anodic control).
  • Transparent - does not change the appearance of the concrete structure.
  • Does not alter the water vapour diffusion properties of concrete.
  • Long term protection and durability.
  • Can be applied to the surface of existing repairs and to surrounding areas.
  • Effective against carbonation.
  • Protects both cathodic (principle 9) and anodic (principle 11) zones of reinforcing steel.
  • Can be applied where other repair/prevention options are not viable.
  • Economic extension of the service life of reinforced concrete structures.
  • Easy, economical application, renewable.
  • Complies with GHS/CLP regulation.
  • Can be used as part of other Sikagard® or Sika MonoTop® concrete repair and protection systems.
  • Penetration depth can be tested on site using the Sika “Qualitative Analysis Test” - refer to your local Technical Service Department for details.
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Product Data Sheet
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Usage

  • For the corrosion protection of steel reinforced concrete structures above and below the ground.
  • As a corrosion control treatment for undamaged reinforced concrete where reinforcing steel is corroding, or is at risk from corrosion due to the effects of carbonated or chloride contaminated concrete.
  • Sika® FerroGard®-903 Plus FD is especially suitable for extending the service life of aesthetically valuable fair-faced concrete surfaces such as historic structures.

Advantages

  • Suitable for method 11.3 (applying inhibitor to the concrete) defined by EN 1504-9 for Principle 11 (anodic control).
  • Transparent - does not change the appearance of the concrete structure.
  • Does not alter the water vapour diffusion properties of concrete.
  • Long term protection and durability.
  • Can be applied to the surface of existing repairs and to surrounding areas.
  • Effective against carbonation.
  • Protects both cathodic (principle 9) and anodic (principle 11) zones of reinforcing steel.
  • Can be applied where other repair/prevention options are not viable.
  • Economic extension of the service life of reinforced concrete structures.
  • Easy, economical application, renewable.
  • Complies with GHS/CLP regulation.
  • Can be used as part of other Sikagard® or Sika MonoTop® concrete repair and protection systems.
  • Penetration depth can be tested on site using the Sika “Qualitative Analysis Test” - refer to your local Technical Service Department for details.

Packaging

  • 23 kg pail
  • 230 kg drum

Colour

Red liquid, the reddish hue typically lasts 28 days depending on exposure conditions, e.g. uv, air humidity and rain.

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • BRE, The use of surface applied Sika® 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
Product Information

Composition

Aqueous solution of amino alcohols & salts of amino alcohols

Shelf Life

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

Storage Conditions

Store in a cool environment. In case of - frost (< -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 re-dissolve the crystals.

Density

~1.05 (at +20 °C)

Viscosity

~20 mPa·s

(Brookfield RVT, spindle 2, 100 rpm, 23 °C)

pH-Value

~10
System information

System Structure

Sika® FerroGard®-903 Plus FD is part of the Sika® Concrete Repair & Protection Systems: 

Repair system

Sika MonoTop®, Sika® Icoment® or SikaTop®

Reinforcement corrosion control

Sika® FerroGard®-903 Plus FD

Concrete protection

Sikagard® Coatings and or Sikagard® Hydrophobic Impregnations
Technical Information

Penetration Depth

Site surveys and experimental tests have shown that Sika® FerroGard®-903 Plus FD 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 to 2 months. This penetration rate can be faster or slower dependent on the porosity of the concrete. Sika® FerroGard®-903 Plus FD penetrates through both liquid and vapour phase diffusion mechanisms.
Note: If, after application of Sika® FerroGard®-903 Plus FD, 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 is then only via 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.

Application

Application Information

Ambient Air Temperature

+5 °C min. / +40 °C max.

Substrate Temperature

+5 °C min. / +40 °C max.
Consumption

Consumption

Generally ~0.50 kg/m² (~480 ml/m²).
For very dense concrete with low permeability, the rate of application of Sika® FerroGard®-903 Plus FD can be reduced but must not be lower than 0.300 kg/m² (290 ml/m²).
To assess project requirements, consumption and depth of penetration shall be checked on site using the Sika “Qualitative Analysis” – refer to the relevant method statement.
Application steps

APPLICATION

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

Sika® FerroGard®-903 Plus FD shall be applied, to saturation, by brush, roller, low-pressure or airless spray equipment.
After the application of the last coat, and as soon as the surface become matt, carry out low-pressure water cleaning (water hose).
The treated surfaces should be cleaned the day after application by pressure washing (~ 10 MPa – 100 bar) to remove any traces of soluble salts that may have deposited on the surface.

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. For dense concrete, additional coats may be required.
Horizontal Surfaces: Saturate surface with 1-2 coats, whilst taking care to avoid ponding.
Waiting time between coats: This is dependent on the porosity of the concrete and the weather conditions, but normally 1-6 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 over-coating with Sikagard® hydrophobic impregnations, Sikagard® breathable coatings or Sikafloor® products (refer to appropriate Product Data Sheets for application details).
If non-Sika coatings are to be applied, please contact the manufacturer's technical department for confirmation of compatibility with Sika® FerroGard®-903 Plus FD or undertake compatibility and adhesion site trials.
When Sika® FerroGard®-903 Plus FD is used within a patch repair or before a cementitious overlay, Sika repair or overlay system can be used. Standard preparation (pre-wetting) shall be applied.
When using a smoothing coat/pore filler over surface4s treated with Sika® FerroGard®-903 Plus FD, products such as SikaTop®-121, Sikagard®-720 EpoCem®, Sika MonoTop®-107, SikaTop®-Seal 107, Sika MonoTop®-723 N, etc. can be used. Cementitious levelling mortars should only be used if there is a well prepared open textured surface that is completely cleaned of residue.
If other Sika cement-based products are to be used, site trials are recommended to confirm preparation and suitability.
If non-Sika cement-based products are to be used, please contact the manufacturer's technical department for confirmation of compatibility with Sika® FerroGard®-903 Plus FD or undertake compatibility and adhesion site trials.

CLEANING OF TOOLS

Use water to clean application equipment.

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