IS 2558:1985 Part 1 is the Indian Standard (BIS) for vitreous china water closets (indian type) - part 1: specific requirements. This standard specifies the dimensions, manufacturing tolerances, finish, and performance requirements for vitreous china water closets of the Indian type (squatting pans). It ensures uniform quality, proper flushing performance, and hygiene across sanitary plumbing installations.
Details specific requirements for Indian type vitreous china water closets, including dimensions and performance criteria.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Water Absorption (of Vitreous China) | Not more than 0.5% of its dry weight | Shall not exceed 0.5% of the dry weight | ASME A112.19.2 |
| Minimum Trap Seal Depth | 50 mm | At least 50 mm | EN 997 |
| Crazing Resistance Test | No crazing after one cycle at 345 kPa (3.5 kgf/cm²) steam pressure for 1 hour. | No evidence of crazing after one cycle at 50 psi (approx. 345 kPa) steam pressure for 1 hour. | ASME A112.19.2 |
| Static Load Bearing Test | 400 kgf (approx. 3.9 kN) applied on the pan without fracture. | 3.0 kN applied for 30 minutes without showing cracks or fracture. | EN 997 |
| Nominal Full Flush Volume | Designed for older high-volume cisterns (e.g., 10-12.5 Litres) | Defined classes, typically 6 Litres or 4 Litres for full flush. | EN 997 |
| Chemical Resistance Test | No visible staining from ink or staining agent. | Not to be visibly affected by specified chemical solutions (e.g., N-Amyl-acetate). | ASME A112.19.2 |