What is the minimum specific gravity required for marble?

2.5 as per the physical properties specified in the code.

What is the minimum hardness required?

It must have a minimum hardness of 3 on the Mohs scale.

What is Group A marble?

Sound marble with uniform and favorable working qualities, free from geological flaws or voids.

IS 1135

: 1993

Marble Slabs and Tiles - Specification

CurrentFrequently UsedSpecificationBIMArchitectural · Flooring and Paving

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This standard specifies the requirements, dimensions, physical properties, and testing methods for marble slabs and tiles used for flooring, facing, and skirting. It provides a classification system for marble based on geological traits and natural flaws to guide engineers and architects in selecting appropriate quality stones.

Specifies requirements for marble slabs and tiles for building purposes, covering dimensions, finish, and quality.

Quick Reference Values

minimum specific gravity2.5

maximum moisture absorption0.4 percent by weight

minimum hardness3 on Mohs scale

thickness tolerance upto 20mm± 1 mm

thickness tolerance above 20mm± 2 mm

length and width tolerance± 1 mm

common slab thickness18 mm or 20 mm

Practical Notes

Marble is classified into four groups (A, B, C, D) based on natural flaws. Groups C and D require factory backing, sticking, or reinforcement before installation.

Strictly monitor the thickness tolerance on site (± 1 mm for typical flooring marble) to prevent lippage and uneven flooring surfaces.

Always check specific gravity and water absorption, as highly porous marble will easily stain and degrade over time.