Industrial Mineral : Pumice, is a porous mineral that forms by the sudden cooling of volcanic lava. When a volcanic eruption occurs, during the rapid solidification of lava, chemical magma gases trapped with in the pumice, finding no time to crystallize due to sudden cooling and form its unique porous structure. This formation which is named pumice provides many commercial benefits such as described under areas used.
Pumice stone is extracted in open-cast quarries.
The pumice stones extracted as aggregates are subjected to treatment according to their final use. They are often purified and calibrated.
Depending on the place of extraction they can have very different characteristics.
Ecological : The Pumice stone is completely natural and produced without blasting, cooking or expanding.
The Pumice is naturally highly porous material. The pores are mostly not interconnected.
The bulk density of pumice is between 300-900 kg/m3.
Pumice has very low heat and sound permeability thanks to porosity.
It’s inert material which doesn’t cause unwanted reactions during usage.
The hardness is 5.5 - 6 on the Mohs scale.
It contains up to 75% silica
Since 1 century BC : Main use of pumice in history was in the construction sector. It is used as a lightweight construction material for thermal baths and temples. The most beautiful examples are Roman Pantheon and Hagia Sophia Church in İstanbul.
Thanks to the lightweight and the insulation characteristic, In modern life it’s used again as a construction material in the Koblenz region/ Germany and in the California region / USA after 1800’s.
The usage started as lightweight construction element (block, lightweight concrete) has spread over time to very different industrial uses.