What is the standard temperature for determining volatile matter in paints?

The sample must be heated in an air oven maintained at 105 ± 2°C.

How do you ensure all volatile matter has completely evaporated?

The sample is heated for a specified duration and weighed repeatedly until successive weighings show a constant mass.

Why is volatile matter testing critical for coatings?

It indicates the proportion of solvents and thinners versus solid binders, directly impacting the paint's coverage area, drying time, and VOC (Volatile Organic Compound) emissions.

IS 101 Part 5/Sec 1

: 1988

Methods of sampling and test for paints, varnishes and related products: Part 5 Chemical tests Section 1 Volatile matter

CurrentSpecializedTesting MethodMaterials Science · Painting, Coatings and Surface Finishing

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This standard prescribes the chemical test method to determine the volatile matter content in paints, varnishes, and related products. Engineers and quality control inspectors use this code to verify the non-volatile (solid) content, assess drying properties, and ensure coatings meet specific quality and environmental specifications.

Specifies methods for determining the volatile matter content of paints, varnishes, and related products.

Quick Reference Values

standard heating temperature105 ± 2 °C

typical sample mass1 to 2 g

cooling environmentDesiccator

Key Formulas

Volatile Matter (%) = [(M1 - M2) / M1] × 100 (where M1 = initial mass of sample, M2 = mass after heating)

Practical Notes

Maintain the drying oven strictly at 105 ± 2°C; higher temperatures may cause decomposition of the paint resin, leading to falsely high volatile matter readings.

Always cool the heated sample in a desiccator before final weighing to prevent moisture absorption from the ambient air, which would skew the mass.