What are the standard atmospheric conditions for testing varnishes in India?

Testing should be carried out at a temperature of 27 ± 2°C and a relative humidity of 65 ± 5%.

How should a sample be drawn if the varnish has settled?

The material must be thoroughly mixed to a uniform consistency before drawing the sample using a clean, dry sampling tube.

What substrates are used for varnish test panels?

Depending on the specific test requirements, mild steel, tinned steel, glass, or timber (such as teak) are utilized.

IS 1477 Part 1

: 1982

Methods of sampling and test for varnishes and lacquers: Part 1 General

CurrentSpecializedTesting MethodMaterials Science · Painting, Coatings and Surface Finishing

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This standard specifies general methods for sampling, preliminary examination, and preparation of test panels for varnishes and lacquers. It establishes baseline conditions and procedures for evaluating coating properties.

Specifies general methods of sampling and testing for varnishes and lacquers.

Quick Reference Values

standard testing temperature27 ± 2 °C

standard relative humidity65 ± 5 %

minimum sample volume500 ml

typical test panel dimensions150 mm x 100 mm or 150 mm x 50 mm

Practical Notes

Test panels must be meticulously degreased and cleaned; residual oil or dust will cause false adhesion and drying failures.

Samples must be stored in airtight containers immediately after sampling to prevent evaporation of volatile solvents.

Assess the 'condition in container' as soon as the sample is opened to accurately observe any skinning or hard settling.