Sandpaper

Formation

The stone pounce is formed at temperatures of about 500 with 600°c. The Lave projected in the air cools very quickly and the fall of pressure involves a degasification which forms bubbles, from where the Porosité and the weak density.

Mineralogy

It is made of fragments of Rhyolite, Dacite or Andésite. She is regarded as a Verre because she does not have a crystalline Structure. She can be various colors, in particular white, yellowish, gray, brown or red pale.

Its average Density is of 910 kg/m3, that is to say lower than that of water, which enables him to float.

Uses

She is usually used in manufacture of light Béton and like abrasive, in particular for polishing.

For its abrasive properties

She is used to use and age artificially the jean stone washed .

She is also used for a long time like Exfoliant in the hammams and the bathrooms deprived to grate callosities of the feet and the elbows.

The powder of more or less fine pounce was used a long time for the maintenance of the house until in the years 1970 (in France). It was used as Scouring powder (sinks for example), of Poudre to knives to polish their blade. It is always useful for fine sandpapering of wood varnished.

Mixed with Soft soap it was used by the mechanics to remove the dirty oil of their hands.

For its porosoté or its lightness

In Chemistry, it is used as homogenizer of the temperature in the reactions. Indeed, its microporosity is supposed to be regular and perfect and is filled of small bubbles of air amorçant the formation of the bubbles in the heated liquid.

The Pozzolana, the shape of stone sandpapers finely crushed, can be mixed with lime to obtain a light, smooth and plastery concrete. This type of concrete was already used in the Antiquité by the Romains.

Bonsais

The stone pounce also finds its place among amateurs of Bonsaï. Indeed, its capacity for important absorption enables him to store water and manure necessary to the good health of the bonsai. It is used more and more with the detriment of the Akadama because of its very impressive results.

Random links: