What material requirements apply to the sinks and tubs covered here?

They must be manufactured from vitreous china conforming to the general quality and testing requirements specified in IS 2556 (Part 1).

Are the dimensions specified exact?

No, vitreous china shrinks during the firing process. Permissible tolerances (typically ± 4% for dimensions 75mm and above) must be accommodated.

Does this standard cover stainless steel kitchen sinks?

No, this part exclusively covers sinks and tubs made from vitreous china (ceramics). Stainless steel sinks are covered under different IS codes.

IS 2556 Part 6

: 2020

Vitreous Sanitary Appliances (Vitreous China) - Sinks and Tubs

CurrentSpecializedSpecificationBIMMEP · Plumbing Fixtures and Valves

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This standard lays down the material, dimensional, constructional, and finish requirements for vitreous china sinks (including laboratory and kitchen sinks) and wash tubs. It ensures uniform manufacturing standards, proper fitment of drainage accessories, and functional durability.

Specifies requirements for vitreous china sinks and tubs.

Quick Reference Values

waste hole diameter65 mm

tolerance dimension under 75mm± 3 mm

tolerance dimension 75mm and above± 4 percent

minimum thickness of vitreous china6 mm

Practical Notes

Always read this standard in conjunction with IS 2556 (Part 1) which dictates the general material and testing requirements for all vitreous sanitary appliances.

Verify the waste hole and overflow dimensions carefully on site, as variations in ceramic shrinkage can occasionally cause fitting issues with standard metallic waste couplings.

BIM modelers should account for the standard tolerances specified, as sanitary fixtures require adequate clearance for installation and sealing.