What is the maximum permissible water absorption for these tiles?

0.5% by mass, as they are classified as vitreous tiles.

Can these tiles be used in environments exposed to hydrofluoric acid?

No, ceramic tiles are susceptible to attack by hydrofluoric acid and its compounds.

Which IS code outlines the testing methods for these acid-resisting tiles?

The various parts of IS 13630 dictate the testing methods for ceramic tiles.

IS 4457

: 2007

Ceramic unglazed vitreous acid-resisting tile

CurrentSpecializedSpecificationArchitectural · Flooring, Wall Finishing and Roofing

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This standard specifies the dimensions, physical, and chemical requirements for ceramic unglazed vitreous acid-resisting tiles used for flooring and wall lining in areas subject to corrosive acid attacks.

Ceramic unglazed vitreous acid-resisting tile

Quick Reference Values

Maximum water absorption0.5 percent by mass

Minimum modulus of rupture35 N/mm²

Maximum loss in mass (Acid Resistance)1.5 percent

Minimum scratch hardness of surfaceMohs scale 7

Practical Notes

These tiles are highly resistant to most acids but are NOT resistant to hydrofluoric acid (HF) and its derivatives.

The overall acid resistance of a floor or wall heavily depends on the bedding and jointing mortars used; ensure they are also acid-resistant (e.g., using resin or silicate based cements as per IS 4832).