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Lava Grade A

Lava, Grade A Lava is a machineable ceramic material, sometimes referred to as 'alumino-silicate', based on its chemical formula.
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Lava 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.)	ºC	No load cond.	1150
Thermal Shock Resistance	DT (ºC)	Quenching	-
Thermal Conductivity	W/m-K @ R.T.	ASTM C408	1.98
Coefficient of Linear Thermal Expansion, al	mm/m-ºC (~25ºC through ±1000ºC)	ASTM C372	3.6
Specific Heat, cp	cal/g-ºC @ 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

*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.