Zinc Primer in Action: Morgan – Whyalla pipeline built 1940's with a single coat of High Ratio Zinc Silicate still in service.

Morgan Whyalla pipeline

The Types of Zinc Primers:

  • Zinc Rich Epoxies – Poor cathodic protection: Generally easier to use as they spray out similar to other industrial epoxies. When Zinc powered is encapsulated with epoxy it limits conduction of corrosion protection.
  • Inorganic Zinc: High levels of industrial protection. High galvanic action, must be top coated. High solvents. Requires high skilled labor, Generally requires near white metal blasting, cannot be repaired.  Not for immersion service.
  • High-Ratio Zinc Silicates: Highest level of protection. High Galvanic action. Does not require top coat. No solvents (VOC Free). Can be applied over flash rust with high adhesion exceeding 3000psi. Repairable, can be top coated.

WB HRZS® is the previously NASA-patented coating technology IC 531. It is a 100% WaterBorne, High Ratio Zinc Silicate. WB HRZS® chemically bonds to steel to provide excellent corrosion protection (both galvanic and cathodic), has high heat and abrasion resistance, is completely self-curing and 0 VOC. WB HRZS® provides unparalleled protection for steel in the harshest marine and offshore environments. It can be used as a Single Coat System, Primer or a Pre-Construction Primer and top-coated with a variety of different options.

WB HRZS® has a quick dry-time which allows for easy application on tanks, barges, ships and causeway systems and will last for extended periods of use. Since multi-coat systems are not required, considerable savings advantages for the marine industry can be realized in both the short and long term while also remaining well within environmental guidelines. WB HRZS® chemically bonds to steel which prevents any undercutting should the structure be damaged while in use. WB HRZS® also has excellent anti-fouling properties; barnacles, zebra mussels, oysters, etc. will not adhere to the coating.


In a recent test at Kennedy Space Center, engineers applied environmentally friendly coatings to steel samples. After 18 months’ exposure in the salty sea air, the HRZS coated samples, bottom, remained nearly pristine, while the ones coated with another product, top, became riddled with rust and corrosion.

Nasa test panel of HRZS