Marble and Granite Water Absorption

Marble and granite water absorption is to be discussed here. It is very important to know the properties of natural stones that are used in building construction in order to determine the specific areas of usage. Among those, water absorption is one of the most important as it determines various mechanical and physical properties.

 

Rocks Absorb Water

Although it’s not obvious to the naked eye, rocks do absorb water. As natural stones, marble and granite countertops have varying degrees of porosity, which means that they will indeed absorb water. 

 

Natural Stone Interconnected Channels

Natural stones hold a network of tiny interconnected channels, sort of like the body’s capillaries, which permit penetration by liquids and gasses. These channels act like a sponge, drawing liquids in over time.

 

Amount of Water Absorbency

The amount of absorbency varies depending on the exact type of stone. For example, denser igneous stones like granite absorb less liquid than their metamorphic counterpart, marble. But prolonged contact with moisture can affect both surfaces. For example, a puddle of water left on the counter for a lengthy period of time may show a dark spot when the water is wiped away. And highly acidic substances like orange juice, coffee, and wine will also etch some marble and granite leaving a dull mark especially on lighter colored stones.

 

 

 

Unsealed Countertops

If countertops are left unsealed, spills can easily penetrate the surface. There are products which have far fewer openings and channels for absorbing liquids. These products are great options for high moisture areas like the bathroom, but there’s no need to worry that water will ruin marble or granite in the bath.

 

Water Absorption Scope

Water absorption is used to determine the amount of water absorbed under specified conditions. Factors affecting water absorption include: type of plastic, additives used, temperature and length of exposure. The data sheds light on the performance of the materials in water or humid environments.

 

Water Absorption Test

For the water absorption test, the specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool. Immediately upon cooling the specimens are weighed. The material is then emerged in water at agreed upon conditions, often 23°C for 24 hours or until equilibrium. Specimens are removed, patted dry with a lint free cloth, and weighed.

 

Testing at Home

If you do have granite or marble countertops, here’s an easy way to test your sealant. Place a few drops of water on the surface. Does the water bead? You’re in good shape. Is it absorbed into the stone pretty quickly? Time to re-seal. 

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Sources

www.marbleandgranite.com/blog/2013/september-2013/how-on-earth-can-marble-or-granite-absorb-water

www.researchgate.net/publication/278399620_Water_absorption_and_drying_features_of_different_natural_building_stones