What is the maximum permissible water absorption for clay flooring tiles?

The maximum water absorption is restricted to 15 percent by mass.

What is the minimum flexural strength required by the code?

Clay flooring tiles must have a minimum flexural strength (modulus of rupture) of 3.0 N/mm².

What is the acceptable limit for efflorescence?

The efflorescence must not be more than 'Slight' when tested.

IS 1478

: 1992

Clay flooring tiles-

CurrentSpecializedSpecificationMaterials Science · Clay and Stabilized Soil Products

Download PDF BIS Portal Google

This Indian Standard specifies the requirements for dimensions, tolerances, physical properties, and testing methods for unglazed clay flooring tiles used in building construction. It establishes essential performance criteria including water absorption, flexural strength, and efflorescence to ensure durability.

Clay flooring tiles-

Quick Reference Values

Maximum water absorption15%

Minimum flexural strength (Modulus of Rupture)3.0 N/mm²

Standard length and width tolerance± 2 percent

Efflorescence limitNot more than 'Slight'

Practical Notes

Tiles must be thoroughly soaked in clean water before laying to prevent them from absorbing moisture from the bedding cement mortar.

Because clay is a natural fired product, slight variations in color, warpage, and dimensions are expected; verify batches against the standard's tolerance limits before acceptance.

Always perform the efflorescence test before large-scale usage to prevent future aesthetic issues on the finished floor.