Grey - Slate
Quarry Location: Belo Horizonte, south-east Brazil
Water Absorption: 0.35 %
Density: 2750 kg/m³
Flexural Strength: 50.7 MPa
Recommended Usage: Building stone, roof tiles, fireplaces, stairs, countertops, sinks, monuments, pool coping, sills, o
Finishing Surface: Sawn Cut, Sanded, Rockfaced, Sandblasted, Bushhammered, Tumbled, Thermalled, Natural Cleft, Weatheredge
Additional Names: SSQ Brazilian Amazonia Graphite, Black Graphite Slate ,Amazonia Graphite Slate
Tested in accordance with EN 12326, it carries the CE marking and is classified as 'A1-T1-S1'
CHEMICAL ANALYSIS
Calcinations loess ……..6,5%
Silicon.……..55,7%
Iron Oxide ………6,3%
Aluminium Oxide …….17,4%
Calcium Oxide ……..6,3%
Magnesium Oxide …2.3 %
Potassium Oxide .……..3.2 %
Sodium Oxide …….1.8 %
Sulphates expressed as SO3…….Inf. 0.1 %
TECHNICAL ANALYSIS
Visible volumetric mass ……..2750 kg/m3
Absorption coefficient …….0,35 %
Breaking load through indirect stress by bending …from 50,7 MPa
Hardness (Mohs)……~ 3,5/4
Wear by attrition: abrasion coefficient in tribometer ….6,7 mm
Frost proof ……Very Good