What is the maximum permissible water absorption for vitreous china WCs?

The maximum water absorption should not exceed 0.5% by mass to ensure durability and hygiene.

What are the standard lengths of Indian type water closets?

Common standard lengths typically specified are 450 mm, 500 mm, 580 mm, and 630 mm depending on the pattern.

Is the trap an integral part of the pan?

It can be integral or separate (P or S trap) depending on the specified pattern, but must maintain the required water seal depth.

IS 2558 Part 1

: 1985

Vitreous China Water Closets (Indian Type) - Part 1: Specific Requirements

CurrentFrequently UsedSpecificationBIMMEP · Drainage, Sewerage and Sanitary Fittings

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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.

Quick Reference Values

max water absorption0.5%

minimum thickness6 mm

typical lengths450 mm, 500 mm, 580 mm, 630 mm

tolerance on dimensions above 75mm± 4 percent

Practical Notes

The pan and the trap are often specified together; ensure compatibility for an effective water seal.

Check for crazing and warpage during site inspection; defective vitreous china can lead to cracking under load.

Ensure proper bedding of the squatting pan in sand/concrete to prevent point-loading fractures.