IS 4597:1968 is the Indian Standard (BIS) for finishing wood and wood-based products with nitrocellulose and cold-catalyzed materials. This standard specifies the procedures for finishing wood and wood-based products using nitrocellulose and cold-catalyzed materials, detailing surface preparation, application techniques, and critical safety protocols.
Code of practice for finishing wood and wood-based products with nitrocellulose and cold-catalyzed materials
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Wood Moisture Content (Interior) | Shall not exceed 12 percent. | Should generally not exceed 15%. | BS 6150:2019 |
| Inter-coat Sanding Abrasive | Specifies grit, e.g., 'No. 220 or 320 waterproof abrasive paper'. | Recommends grit range (e.g., 280-320 grit) but focuses on the result of 'sanding smooth' without swirl marks. | AWI 1500 - Finishes |
| Dry Film Thickness (DFT) Control | Indirectly controlled by specifying the number of coats to be applied. | Specifies a minimum total DFT, e.g., '2.0 mils (50 microns) minimum' for a catalyzed system. | AWI 1500 - Finishes |
| Spray Application Pressure | Prescribes a specific range: '3.5 to 4.5 kgf/cm²' (approx. 50-65 psi). | Defers to the coating manufacturer's Technical Data Sheet (TDS) as pressure varies by equipment (HVLP, Airless) and product. | AWI 1500 - Finishes |
| Finish Quality Assessment | Visual inspection: 'final surface shall be smooth and free from blemishes'. | Performance test: 'No blistering, printing, or change in gloss after a 24-hour hot/cold cycle test'. | ANSI/KCMA A161.1-2022 |
| Chemical Resistance Test | Not specified; implies resistance to 'mild acids and alkalis'. | Must show no damage after 24-hour exposure to specific reagents like vinegar, lemon juice, and coffee. | ANSI/KCMA A161.1-2022 |
| Drying Time Reference | Provides indicative times within the standard (e.g., 'at least 4 hours' for sealer). | Requires adherence to the coating manufacturer's documented recommendations. | AWI 1500 - Finishes |