Alumina Properties

TECHNICAL SPECIFICATION

Max use temperature (No load)	1750 ⁰ C
Bulk Density (typical)	3.92 g/cc
Open Porosity	% - 0
Permeability	Gas – Tight
Water absorption	None
Compressive Strength	> 300,000 psi
Thermal conductivity 20 ⁰C	30.0 W/m ⁰ K
Expansion Coefficient 25 ⁰ C – 1000 ⁰ C 1 X 10 ^-⁶ ⁰C	8.2
Hardness, Vickers	17.50 GPa
Chemical Tests (Crucible 32 g weight)	Hot concentrated sulfuric acid, 100 ⁰ C ( 4 hours : weight loss ~ 6 x 10 ^-⁴ % ) Hot 10% sodium hydroxide, 100 ⁰ C ( 4 hours : weight loss ~ 9 x 10 ^-⁴ % ) Hot 50% phosphoric acid,90 ⁰ C ( 4 hours : weight loss ~ 0.16 % )

This information is intended to illustrate typical properties of advanced ceramics materials available from Nimra Cerglass. The purchaser should recognize that exact properties which may vary according to product configuration and can sometimes be tailored to meet specific requirements. The information set forth herein is offered for comparison only, and is not to be construed as absolute engineering data or constituting a warranty or representation for which we assume legal responsibility.

Ceramic property values vary somewhat with method of manufacture, size, and shape of part. Close control of values of most. All data measurements are typically and made at room temperature unless otherwise noted.