Good Natural Pumice stone

Size:1-3mm,3-5mm,5-7mm,7-10mm,5-10mm;1-2cm,2-4cm,3-5cm,5-10cm,10-15cm,etc   1.Chemical Composition:  

SiO2	CaO	MgO	Fe2O3	FeO	Al2O3	TiO2	K2O	Na2O
53.82%	8.36%	2.46%	9.08%	1.12%	16.89%	0.06%	2.30%	2.55%

   2.Properties: 1.It has lots of holes. 2.Weight is very light. 3.Perfect intensity 4.Heat preservation and thermal insulation, noice insulation. 5.Fireproofing 6.Corrosion and acid-base resisting 7.Non-pollution and no radioactivity, environment protection   3.Physical properties:

Volume-weight(kg/m3)	430-870
Water absorption	11.7-17.03%
Loose volume-weight(kg/m3)	520
Cylinder pressure strength	1.218Mpa
Moisture	1%
Mechanical Intensity	5.08Mpa
Heat conductivity coefficient w/(m.k)	0.326
Soften coefficient	0.84
Apparent density	Kg/m 3 640-860/(390*240*190)
Hollow ratio(%)	48/(390 *240 *190)

  4.Applications: Lava is used in construction,irrigation works, grinding, filter material, barbecue charcoal, garden scene, soilless culture, etc. It is also a perfect material used in hot stone therapy, which is good to Promote the body's metabolism.   The pictures following are taken by real products:       Alibaba Certificate:     Tel: 86 13722996216, 0311 68123200