Introduction

Americos supplies of all types and grades of pumice stone. For textile general grade are 1-3 cm, 2-4 cm, 3-5 cm and 5-7 cm. It is pure white and leaves very little waste when used, compared to those of other stones, thus making sabay Pumice recognized and demanded by the end users in many markets of the world.

There are three types of pumice products, which Americos supplies. The first is the micronised pumice powder, from 0 to 160 microns. The second is the pumicite (mainly for construction and horticulture purposes) from 3-8 mm to 15-20 mm. The third is the textile graded as 1-3 cm, 2-4 cm, 3-5 cm and 5-7 cm.

Americos supplies following types of stones :

• 3-8 mm Pumice Stone double washed, three times tumbled
• 1 cm standard Pumice Stone double washed, three times tumbled
• 1-2 cm/ 1-3 cm Pumice Stone double washed, three times tumbled
• 2-3 cm/2-4 cm Pumice Stone double washed, three times tumbled
• 3-5 cm/ 5-7 cm pumice stone double washed, three times tumbled
• 3-8 cm Pumice Stone double washed, three times tumbled

Typical Chemical Properties

Silica	(SiO2)	71.75	70.90
Aluminum Oxide	(Al2O3)	12.33	12.76
Ferric Oxide	(Fe2O3)	1.98	1.75
Ferrous Oxide	(FeO)	0.02	0.64
Magnesium Oxide	(MgO)	0.12	0.09
Calcium Oxide	(CaO)	0.70	1.36
Sodium Oxide	(Na2O)	3.59	3.23
Potassium Oxide	(K2O)	4.47	3.83
Manganese Oxide	(MnO)	0.07	0.09
Titanium Dioxide	(TiO2)	0.11	0.14
Phosphorous Pentoxide	(P2O5)	0.008	0.015
Sulphur Trioxide	(SO3)	0.18	0.21
Combined Water	(H2O+)	3.71	3.88

Typical Physical Properties

Refractive Index	1.5
Hardness (Mohs Scale)	6.0
Melting Point	15000°C
pH Value	8.0
True Density (ISO 787.10)	2.313(g/cm3)