IS 101:1988 Part 5/Sec 1 is the Indian Standard (BIS) for methods of sampling and test for paints, varnishes and related products: part 5 chemical tests section 1 volatile matter. 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.
IS 101 Part 5 Sec 1 (1988) provides Methods of Sampling and Test for Paints, Varnishes and Related Products — Part 5: Chemical Tests, Section 1: Volatile Matter. The test for volatile content (typically solvents) in paints, varnishes, and coatings used in building + industrial applications.
Use when: paint quality verification; specifying paint for buildings, equipment, infrastructure; coatings for steel + concrete structures.
Test methodology: - Take paint / coating sample (typically 50-100 g) - Heat at specified temperature (105 °C typical) for set duration - Measure weight loss = volatile content - Result in % volatile by mass
Volatile components: - Solvents (for solvent-based paints) - Water (for water-based paints) - Plasticizers (in some formulations) - Reactive components in some coatings
Test importance: - Volatile organic compounds (VOCs) emission - Environmental compliance - Storage / shelf life - Paint film formation - Cost calculation (solids vs solvent)
Typical volatile content: - Solvent-based gloss paint: 35-50 % - Water-based emulsion: 50-70 % - High-solids industrial: 15-30 % - Powder coatings: 0 % (no volatile) - Modern eco-paints: lower VOC; < 30 % typical
Volatile content (acceptance ranges per paint type): - Decorative interior emulsion: 45-65 % - Exterior emulsion: 40-55 % - Solvent-based industrial: 35-50 % - Marine / chemical-resistant: 30-45 % - Anti-corrosion primer: 35-50 % - Powder coating: 0 %
Quality control: - Per shipment / per batch testing - Calibrated lab equipment - NABL accreditation preferred - Repeatable + reproducible methodology
Environmental compliance: - VOC limits per CPCB rules (varies by category) - Modern building standards (LEED, GRIHA) prefer low-VOC paints - Health + safety considerations (occupational)
Acceptance: - Per manufacturer specification - Per project specification - VOC compliance per local regulations - Storage shelf life acceptable
1. Sample contaminated → wrong result. 2. Drying temperature wrong → incomplete or excessive loss. 3. Drying time insufficient → moisture retained. 4. Sample size inappropriate → variability. 5. No calibration → systematic error. 6. No batch consistency → quality varies. 7. Storage in heat → premature evaporation. 8. No VOC compliance check → regulatory issue.
1. Manufacturer testing per IS 101 + per shipment. 2. Site receipt: sample testing + verification. 3. Storage in cool dry conditions. 4. Application per manufacturer instruction. 5. Drying + curing (allows volatile to evaporate). 6. Long-term: paint film performance.
IS 101 Part 5/Sec 1 is the routine quality test for paints + coatings in India — applied at every paint manufacturer + every major painting project.