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Comparison of Alumina, Mullite, and Quartz Tube of Properties

Chemistry

Max. Working Temperature (no load)

Thermo-conductivity

Thermo-expansion

Flexural Strength

Alumina  (99.8%)

1800 oC

8.2 W/m*oC

8.4 x 10^-6/oC

380 Mpa

Mullite   (60% Al2O3+ 38%SiO2)

1500 oC

3.6 W/m*oC

5.4 x 10^-6/oC

180 Mpa

Quartz (99.9% SiO2)

 1200 oC

1.4 W/m * oC

5.5 x 10^-7/oC

48 MPa

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