This standard specifies the material, manufacturing, dimensional, and performance requirements for vitreous china sanitary appliances. It covers items like water closets, wash basins, and urinals, and includes key tests such as water absorption, crazing, and chemical resistance.
Methods of test for strength and stability of chairs and stools, Part 2: Determination of stability of chairs and stools
Quick Reference Values
Maximum water absorption0.5 % by mass
Minimum thickness of ware6 mm
Crazing test steam pressure0.35 MN/m² (approx 3.5 kgf/cm²)
Crazing test duration1 hour
Test temperature for thermal shock110°C
Practical Notes
Vitreous china is defined by its very low water absorption (<0.5%), distinguishing it from less durable earthenware or fireclay sanitaryware.
This 1969 version is obsolete. For all new projects, refer to the comprehensive IS 2556 series which has superseded this and related standards for specific products.
On-site inspection for visible defects like cracks, chips, and uneven glazing is crucial before installation, as these are grounds for rejection under the code.