Product Data Sheet
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Sika® FerroGard®-903

Penetrating, corrosion inhibiting, impregnation coating for hardened concrete

Sika® FerroGard®-903 is a corrosion inhibiting impregnation coating for hardened concrete surfaces. It is designed to penetrate the surface and then to diffuse in vapor or liquid form to the steel reinforcing bars embedded in the concrete. Sika® FerroGard®-903 forms a protective layer on the steel surface which inhibits corrosion caused by the presence of chlorides as well as by carbonation of concrete.       How it works Sika® FerroGard®-903 is a combination of amino alcohols, and organic and inorganic inhibitors that protects both the anodic and cathodic parts of the corrosion cell. This dual action effect dramatically delays the initiation of corrosion and greatly reduces the overall corrosion activity. Sika Sika® FerroGard®-903 protects the embedded steel by depositing a physical barrier in the form of a protective layer on the surface of the steel reinforcement. This barrier inhibits corrosion of the steel.

Sika® FerroGard®-903 offers owners, specifiers, port authorities, DOTs, and engineers, a new technology in corrosion inhibition that can easily be applied to the surface of existing concrete to extend the service life of any reinforced concrete structure.
  • Protects against the harmful effects of corrosion by penetrating the surface of even the most dense concrete and diffusing to the steel to inhibit corrosion.
  • Enhances the durability of reinforced concrete.
  • Does not require concrete removal.
  • Environmentally sound.
  • Does not contain calcium nitrite.
  • Easily applied by either spray or roller to all existing reinforced concrete.
  • Can be applied to reinforced concrete that already exhibits corrosion.
  • Adds additional benefits when used prior to protective coatings in concrete restoration systems.
  • Water based for easy handling and application.
  • Not a vapor barrier; allows vapor diffusion.
  • FerroGard has been proven effective in both laboratory (ASTM G109/Cracked Beams) and field analysis.
  • ANSI/NSF Standard 61 potable water approved
Product Data Sheet
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Usage

Sika® FerroGard®-903 is recommended for all steel-reinforced, prestressed, precast, post tensioned or marine concrete. Use of Sika® FerroGard®-903:
  • Steel-reinforced concrete, bridges and highways exposed to corrosive environments (deicing salts, weathering)
  • Building facades and balconies
  • Steel-reinforced concrete in or near a marine environment
  • Parking garages
  • Piers, piles, and concrete dock structures
  • As part of Sika’s system approach for buildings and civil engineering structures
 

Advantages

Sika® FerroGard®-903 offers owners, specifiers, port authorities, DOTs, and engineers, a new technology in corrosion inhibition that can easily be applied to the surface of existing concrete to extend the service life of any reinforced concrete structure.
  • Protects against the harmful effects of corrosion by penetrating the surface of even the most dense concrete and diffusing to the steel to inhibit corrosion.
  • Enhances the durability of reinforced concrete.
  • Does not require concrete removal.
  • Environmentally sound.
  • Does not contain calcium nitrite.
  • Easily applied by either spray or roller to all existing reinforced concrete.
  • Can be applied to reinforced concrete that already exhibits corrosion.
  • Adds additional benefits when used prior to protective coatings in concrete restoration systems.
  • Water based for easy handling and application.
  • Not a vapor barrier; allows vapor diffusion.
  • FerroGard has been proven effective in both laboratory (ASTM G109/Cracked Beams) and field analysis.
  • ANSI/NSF Standard 61 potable water approved

Packaging

5 gallon pails with spout, 55 gallon drums.

Color

Pale Yellow

Product Details

Product Information

Shelf Life

18 months minimum in original, unopened container

Storage Conditions

Store at 40–95 °F (4–35 °C). Protect from freezing. If frozen, discard.

Density

1.13 (9.4 lbs./gal.)

pH-Value

11 (±1)

Viscosity

15 cps
Technical Information

Penetration Depth

Key CriteriaPerformance LevelTest Method/Institute
Corrosion Inhibition Sika® FerroGard®-903 corrosion inhibitors delay the onset of corrosion and reduce the rate of corrosion by 65% versus control specimen after 1 year.1
Penetration Rate in hardened concreteSika® FerroGard®-903 penetrates independently of orientation (horizontal, vertical, overhead) at a rate of 1/10 to 4/5 inches (2.5 to 20 mm)per day, depending on the density of the concrete.2
Depth of PenetrationSika® FerroGard®-903 penetrates up to 3 inches (76 mm) in 28 days.2
Protective layer on steelSika® FerroGard®-903 forms a protective layer on the reinforcing steel of high integrity measured at as much as 100 Å in thickness3
Displacement of chlorides from steel surfaceSika® FerroGard®-903 forms a continuous film on the reinforcing steel and displaces chloride ions from the steel surface.3
Corrosion Rate Field MonitoringReduction of corrosion rates in excess of 65%.4

Test Method/Institute:

1 Cracked Concrete Beam Test (adapted from ASTM G109)

2 Secondary Neutron Mass Spectroscopy (SNMS) / Institute for Radiochemistry, Karlsruhe (Germany), Prof.
Dr. J. Goschnick.

3 X-ray Photon Spectroscopy (XPS) and Secondary Ion Mass Spectroscopy (SIMS) / Brundle and Associates, San Jose, CA and University Heidelberg (Germany), Prof. M. Grunze.

4 Performance of Corrosion Inhibitors in Practice, Graeme Jones, C-Probe Technologies Ltd., 2000

Application

Consumption

Coverage

For normal concrete, application is 200 ft.2/gal. each coat. A minimum of two coats is always recommended. For dense concrete, application may exceed 300 ft.2/gal. Therefore, more than two coats may be required to achieve the total application rate: 100 ft.2/gal.
Application steps

APPLICATION

Sika® FerroGard®-903 is applied by roller, brush or spray on concrete surfaces. When spraying, use a conventional airless spray system or hand-pressure equipment. A minimum of two coats is always recommended. Dense substrates may require more coats. Waiting time between coats of Sika® FerroGard®-903 is at least 1 hour. Allow a minimum of one day to allow Sika FerroGard 903 to dry and penetrate.
When Sika® FerroGard®-903 is used prior to the application of a repair mortar, concrete overlay, protective coating, Sikafloor system or any other application, care must be taken to remove any residue remaining on the surface from the application of Sika® FerroGard®-903. Clean the substrate in such a manner (i.e. push the water in one direction away and off from the surface to be overcoated) to completely remove any residue. Horizontal surfaces require pressure washing (2,000 psi minimum) to remove the residue. Vertical surfaces may be rinsed with water or pressure washed. The use of Sika Armatec 110 EpoCem as a bonding agent prior to the application of repair mortars or concrete overlays is suggested. Drying times depend on environmental conditions, absorbency of the substrate and maximum recommended moisture content for the subsequently applied system.

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