The G-350 Series Chelating Coatings are high performance coatings developed for use in areas where corrosion and fire resistance are major considerations. In addition, the G-350 Series Chelating Coatings are flexible, abrasion resistant and, because of their lower dry film weight, well suited for application in weight critical areas. The G-350 Chelating Coating reacts with top layer atoms of aluminum, iron, steel and copper on which it is coated, incorporating them into the actual coating. The coating bonds equally well with the oxides of these metals. It is this bonding reaction which gives the resultant G-350 Chelating Coating its high performance properties. It is extremely resistant to fire and does not blister or peel when subjected to extreme heat. The G-350 Chelating Coating also bonds very well to certain types of plastic composites and forms a superior moisture barrier, thus allowing a longer exterior exposure time for those materials.

The G-350 Chelating Coating is used on-aircraft, ships, barges, bridges, railcars, pipe lines, shipping containers, storage tanks above and below ground, and other metal structures. The unique nature of G-350 provides its users with both superior performance and cost savings over an epoxy, alkyd or polyurethane coating.

G-350 Chelating Coating is available as a one-step, single coat in many colors. It is also available as a primer for use under other types of coatings.

The G-350 Chelating Coating can be used in place of primer and finish coat. Applications include aircraft, ship, and rail car refurbishing and new fabrications. The chelating technology of the G-350 Chelating Coating makes it superior to all other coatings on the market in corrosion resistance and metal surface adhesion.

The G-350 Chelating Coating is also available as a coating for reinforcing metals in all concrete, bridge and roadway construction. One of the main features of the Chelating Coating is that it does not allow undercutting failure when the coating surface is damaged. Undercutting takes place when moisture penetrates to the steel substrate followed by buildup of corrosion products underneath a coating can which causes disbonding and eventual failure of the coating. Osmosis is an important factor in undercutting failure, especially when coatings are subjected to salt exposure, water immersion, frequent condensation, or high-humidity environments. A coating must have strong adhesion to the substrate to be resistant to undercutting. Organic barrier coatings tend to be less resistant to undercutting because the adhesion of organic coatings is primarily physical, whereas the adhesion of the G-350 Chelating Coating is a result of the chemical bond between the metal and the coating. This chemical bond is more durable and more resistant to undercutting making the G-350 a superior coating.

This is of particular advantage in new construction, when large parts are damaged during assembly. This feature also makes the G-350 Chelating Coating especially well suited for coating concrete reinforcing rods. The alkaline environment of the concrete promotes corrosion caused by surface damage, which leads to failure of the concrete structure. The G-350 Chelating Coating prevents this.

When a substance employs the chelating process (literally, "grabs like a claw") onto a metal surface, the material does not simply cover that surface. The atoms in the G- 350 coating actually chemically bond with the atoms in the metal substrate, making the top layer of the metal and Chelating Coating into a new organo-metallic material-one much tougher than conventional coatings.

The performance advantages of a Chelating Coating over a conventional coating are many. The unique process by which the G-350 Chelating Coating bonds to the coated material means that undercutting and corrosion are practically eliminated. Additionally, the stability of the G-350 chemical complex makes the coating far more resistant to attack by weathering, fire, abrasion or chemicals than conventional coatings. Gryphin’s G-350 Chelating coating achieves all of this while providing a low VOC levels and low dry film weight.

G-350 Chelating Coating also carries significant cost advantages. The single coat system of the G-350 Chelating Coating eliminates the "use or loose" situations in coating applications. Two or more part coating systems require their user to either apply all of the mixed coating or dispose of the unused portion. With the G-350 the unused portion can be stored for later eliminating costly waste. The superior adhesion of the single coat G-350 Chelating Coating system also translates into a reduction in labor required for both surface preparation and the coating application itself.

Chelation technology has been used for many years in water softeners (ion exchange) and boiler treatment. More recently, the Gryphin Company has been in the forefront of applying the principles of Chelation to coatings technology.

Chelation is a chemical reaction or process involving the formation of a very stable molecular ring structure that incorporates the metal substrate as part of the ring. As you can see in the figure, each of the three active sites of the G-350 Chelating Resin molecule donates a pair of electrons to the metal atom. The iron or aluminum atom, in turn, can form six bonds. Thus, two Chelating Resin molecules bond with each atom of the metal, forming four stable rings. The coating and the metal substrate become one exceptionally stable layer.

As with any coating application, the better the preparation, the better the results!

Applicable SSPC standards: SP-2 is acceptable, SP-3 is recommended, SP-6 achieves best results

In order to obtain optimum adhesion to a surface, that surface must be free of all foreign matter. Any din, grease, oil, rust or other matter will prevent maximum available adhesion and will somewhat reduce the life of the coating. In particular, all old paint must be removed in order for the chelating reaction to take place. The area to be coated should be sandblasted or wire brushed clean. All dust and rust flakes should be removed with an air hose, using clean, dry compressed air.

The surface should be coated with G-350 Chelating Coating immediately.

G-350 Chelating Coating may be sprayed brushed or rolled. G-350 Chelating Coating should be mixed thoroughly, preferably with a power mixer, before application. G-350 Chelating Coating is ready to be applied directly from the can and should not be thinned with solvents.

Humidity has a substantial impact on surface preparation and on how well the coatings cure. The 85% maximum relative humidity requirement is the accepted standard.

When the 85% limit is exceeded, the metal substrate, before being primed, corrodes much faster. Also, when the maximum limit is surpassed, the cure of most paints is slowed and sometimes altered. The result can be blooming or blushing followed by the failure of the coating systems.

The dew point is also critical during surface preparation and the application of coatings. The dew point is the temperature at which water will condense on a surface at a given humidity. In order to avoid moisture contamination and, corrosion failure, the substrate temperature should be 5 degrees above the dew point temperature.

G-350 Chelating Coating may be cleaned up with mineral spirits

The G-350 Chelating Coating is available in five MIL-595 standard colors:

• haze gray
• dark gray
• red
• black
• off-white.

For other colors special arrangements can be made.

In order to avoid loss of solvent and subsequent increase in viscosity and surface skin formation, keep the container closed as much as possible. If this procedure is followed the working life is indefinite.

The G-350 Chelating Coating dries to touch in 3 to 4 hours Specific curing times are as follows:

70 deg. F 24 hours

60 deg. F 48 hours

Normal coverage for G-350 Chelating Coating is 140 to 160 sq. ft per gallon, .25 to .33 sq. meters per liter, when applied in 3 to 4 mm thick coat. The coating may be back sprayed to the desired thickness when the solvent has evaporated.

The shelf life of the G-350 Chelating Coating is one year in a closed container. When the container is left opened a surface "skin" may form. This "skin" should be removed before the coating is mixed otherwise the coating should be filtered before use.