IS 2556:1994 is the Indian Standard (BIS) for vitreous china wash basins. This standard covers the material, dimensional, and manufacturing requirements for vitreous china wash basins, including flat back and angle back varieties. It ensures adequate performance, hygiene, and compatibility with standard plumbing fixtures.
Specifies requirements for vitreous china wash basins, covering dimensions, quality, and performance.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- MEP — Drainage, Sewerage and Sanitary Fittings
- Type
- Specification
Also on InfraLens for IS 2556
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Always verify the waste hole diameter before ordering trap fittings to avoid connection issues.
! Account for the ±4% dimensional tolerance when designing custom countertops or tight vanity spaces.
! Ensure the wall mounting brackets correspond to the standard fixing hole locations specified for the selected basin type.
Frequently referenced clauses
vitreous chinaceramicporcelain
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values5
Quick Reference Values
Tolerance for dimensions >= 75 mm± 4%
Tolerance for dimensions < 75 mm± 3 mm
Minimum thickness of body6 mm
Waste hole diameter45 mm to 48 mm
Minimum overflow slot area5 cm²
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Flat Back Wash Basins
Table 2 - Dimensions of Angle Back Wash Basins
Key Clauses
Clause 3 - Material and Manufacture
Clause 4 - Dimensions and Tolerances
Clause 5 - Finish and Glazing
Clause 6 - Overflow
Clause 7 - Waste Hole
Frequently Asked Questions4
What is the standard tolerance for wash basin dimensions?+
± 4% for dimensions 75 mm and above, and ± 3 mm for dimensions below 75 mm.
What is the required size of the waste hole?+
The waste hole diameter must be between 45 mm and 48 mm.
Are overflows mandatory for these basins?+
Yes, unless specified otherwise by the purchaser, wash basins must have an internal overflow with a minimum area of 5 cm².
What is the minimum thickness of the vitreous china material?+
The material thickness should not be less than 6 mm.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.