QUESTION

A CLIENT OF MINE HAS LIMESTONE COUNTERTOPS OUT OF PETIT GRANIT AND SHE IS FINDING WHITE STAINS ON HER COUNTER TOPS HOW IS THIS POSSILE.
THANK YOU,

ANSWER

ANSWER - In spite of the name suggesting it is granite, Petit Granit is known as a Belgian Limestone.  Several sources on the internet state not to use it as a countertop and say it has high absorption.  It is a very dark material that gives it more of granite look so I assume that is how it got its name.

The geological classification for limestone per ASTM C568 breaks limestone down into 3 classes.  Class 1 low density, Class 2 is medium density, and class 3 is high density.  A high density limestone must have no more than 3% absorption, which is high compared to a granite that can't have more than 0.4% absorption.

So unless you seal the Petit Granit limestone and make sure you clean up spills promptly and properly and reseal about every 6 months to a year, it could still have a propensity to stain.