This standard specifies the requirements, sampling, and testing methods for a single-pack, air-drying zinc-rich priming paint. It is intended for the primary corrosion protection of steel surfaces, providing cathodic protection due to its high zinc content.
Specifies requirements and methods of test for zinc rich priming paint, solvent-based and water-based, for protection of steel structures.
Quick Reference Values
Minimum zinc dust content in non-volatile matter80% by mass
Maximum surface dry time1 hour
Maximum hard dry time24 hours
Minimum volume solids35%
Flexibility and adhesion test mandrel diameter6 mm
Maximum fineness of grind40 microns
Practical Notes
Ensure proper surface preparation (e.g., blast cleaning to Sa 2.5 as per IS 9954) is achieved before application for optimal performance.
The high zinc content gives cathodic protection but requires continuous agitation during application to prevent the heavy zinc dust from settling.
This is a single-pack primer, making it easier to use on-site compared to two-pack epoxy zinc-rich primers, but it generally offers lower chemical and abrasion resistance.