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Ceramic Properties - Lava, Grade A
Lava is a machineable ceramic material, sometimes referred to as 'alumino-silicate', based on its chemical formula. It has a high use temperature, and excellent thermal and electrical insulating properties.
Properties Units Test Value Physical Chemical Formula [Al2(Si4O10)(OH)2] Density, r g/cm3 ASTM C20 2.30 Color pink Crystal Structure random Water Absorption % @R.T. ASTM C373 2.5 Hardness Moh's 6 Hardness knoop (kg/mm2) Knoop 100g 500 Mechanical Compressive Strength MPa @ R.T. ASTM C773 172.5 Tensile Strength MPa @ R.T. ACMA Test #4 20.7 Modulus of Elasticity
(Young's Mod.)GPa ASTM C848 -- Flexural Strength (MOR) MPa @ R.T. ASTM F417 69 Poisson's Ratio, u ASTM C818 -- Fracture Toughness, KIc MPa x m1/2 Notched Beam Test -- Thermal Max. Use Temperature
(* denotes inert atm.)C No load cond. 1150 Thermal Shock Resistance DT (C) Quenching -- Thermal Conductivity W/m-K @ R.T. ASTM C408 1.98 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 3.6 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.20 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 5.3 Dielectric Strength kV/mm ASTM D116 0.1 Electrical Resistivity Wcm @ R.T. ASTM D1829 1014
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