What is the primary application of IS 104 zinc chrome primer?

It is used as a highly effective anti-corrosive primer for bare structural steel and iron surfaces before applying intermediate or topcoats.

What is the testing standard used to verify the properties of this paint?

The IS 101 series of standards is used to test the drying time, consistency, flash point, and other chemical/physical properties.

What is the maximum allowed drying time for this primer?

Surface dry should be achieved within 4 hours, and hard dry within 24 hours.

IS 104

: 2017

Ready Mixed Paint, Brushing, Zinc Chrome, Priming, For Steel - Specification

CurrentFrequently UsedSpecificationMaterials Science · Painting, Coatings and Surface Finishing

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This standard prescribes the requirements and methods of sampling and testing for ready mixed zinc chrome brushing paint. It is primarily used by engineers and painting inspectors as an anti-corrosive primer coat for the protection of structural steelwork and iron surfaces.

Specifies requirements and methods of test for ready mixed, brushing, zinc chrome priming paint for steel, Type 1 and Type 2.

Quick Reference Values

surface drying timeMax 4 hours

hard drying timeMax 24 hours

flash pointNot less than 30°C

mass per 10 litres12.5 to 14.5 kg (typically)

mandrel size for flexibility test6.25 mm

Practical Notes

Proper surface preparation (e.g., abrasive blast cleaning to Sa 2.5 or thorough manual wire brushing) is essential before applying zinc chrome primer to ensure proper adhesion.

Although formulated primarily for brushing to ensure penetration into surface pores, it can often be sprayed if appropriately thinned.

Do not leave the primer exposed to the environment without a suitable topcoat for extended periods, as it is designed as a base coat, not a weathering finish.