Machinable Alumina Silicate L911A (Lava)

Alumina Silicate (Grade A Lava) is machinable in an unfired state and used in applications up to 1000 ºF. After firing, parts are as hard as carbide & usable up to 2100 ºF. Alumina Silicate is low cost and available in a wide range of stock up to 12" in diameter. Some applications include prototype, insulators, bushings, soldering fixtures, nozzles, welding tips.

Lava Material Safety Data Sheet (MSDS) (pdf)

Fired Material Specifications
Physical Properties Units Test Lava
Chemical Formula   - Al2(Si4010)(OH2)
Density g/cm³ ASTM C20 2.30
Color - - pink
Crystal Structure - - random
Water Absorption % ASTM C373 2.5
Hardness Moh's - 6
Hardness Knoop
(kg/mm1)		 Knoop 100g 500
Mechanical Properties Units Test Lava
Compressive Strength psi
MPa		 ASTM C773 172.5
Tensile Strength psi
MPa		 ACMA TEST# 4 20.7
Modulus of Elasticity
(Young's Mod.) 		psi x 106
GPa		 ASTM C848 -
Flexural Strength psi
MPa		 ASTM F417 69
Poisson's Ratio - ASTM C818 -
Fracture Toughness MPa x m1/2 Notched Beam -
Thermal Properties Units Test Lava
Max. Use Temperature
(* denotes insert atm.) 		°F
°C		 No Load Cond. 1150
Thermal Shock Resistance DT (ºC) Quenching -
Thermal Conductivity W/m.K ASTM C408 1.98
Coefficient of Linear
Thermal Expansion 		µm/m-°C
(~25°C though +/- 1000°C)		 ASTM C372 3.6
Specific Heat cal/g/°C ASTM C351 0.20
Electrical Properties Units Test Lava
Dielectric Constant 1Mhz @ R.T. ASTM D150 5.3
Dielectric Strength V/mil
kV/mm		 ASTM D116 0.1
Electrical Resistivity Wcm @ R.T. ASTM D182 1014

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