What is the standard material for an Indian type water closet?

Vitreous china, which must conform to IS 2556 (Part 1).

What is the minimum required depth for the water seal?

The water seal must have a minimum depth of 50 mm (Clause 6.3).

How is the flushing performance evaluated?

Using a 10-litre flush, the water closet must successfully wash away at least 95 out of 100 polypropylene balls of 12 mm diameter in a single flush (Clause 7.2).

What does the crazing test ensure?

The crazing test (Clause 8) ensures that the glaze on the sanitaryware is durable and will not develop a network of fine cracks over time when subjected to temperature and pressure changes.

IS 5326

: 2001

Indian type water closets - Specification (Second Revision)

CurrentFrequently UsedSpecificationBIMMEP · Environmental and Sanitation

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This standard specifies the requirements for materials, dimensions, manufacture, workmanship, finish, and testing of Indian type water closets made from vitreous china. It covers aspects like flushing efficiency and durability to ensure the quality and performance of these common sanitary fixtures.

Specifies material, dimensions, construction, and performance requirements for Indian type water closet (WC) pans.

Quick Reference Values

Minimum water seal depth50 mm

Nominal outlet diameter100 mm

Water absorption limit for vitreous china0.5 %

Flushing test volume10 litres

Crazing test pressure0.7 MN/m² (7 kgf/cm²)

Minimum flushing surface200 mm x 175 mm

Practical Notes

Ensure the trap type ('P' or 'S') is correctly specified based on the drainage pipe layout to maintain the water seal and prevent sewer gas entry.

Always check for the ISI Standard Mark on the product as a certification of conformity to this standard.

Verify compatibility with the cistern or flush valve, ensuring it provides the required 10-litre flush volume for effective cleaning as per the flushing test.