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Material Characteristics and Product Properties

 

Alumina 99.7%     Alumina 60%,80%,99.5%     Zirconia     Fused Silica     Agate  


Alumina 99.7% Labware



99.7% Alumina Labwares are made from special grade of Alumina imported from ALCOA Germany.

These Labware are made by slip casting and pressure casting. Special care is taken to maintain purity of sintered Alumina to be above 99.7%

Sintered Grain Size is between 2-4 microns.   

Tolerance: +/- 1mm for all dimensions up to 50 mm. +/- 2mm for all dimensions above 50 mm.

Typical Chemical Composition of ALCOA Powder (Sintered Product) by wt % 
Al2O3 [%]   99.8 (99.7)               SiO [%]    0.015 (0.05)              MgO  [%]   0.04 (0.08)
Na2O [%]   0.03 (0.03)               Fe2O3 [%] 0.015 (0.015)              CaO   [%]   0.01 (0.03)
All date are based upon Ants standard test methods. The typical values are based upon actual averages from production data.

Sintered Density:  above 3.9 gm/cc, above 98%  TD (3.96gm/cc)   

Lustre and Color: With submicron Alumina powder from ALCOA, Ants create special Vitreous Lustre, Ivory Color and a Translucent high purity Alumina.

Solubility in boiling HF: 0.1 % by wt after three hours .
Solubility in boiling HCL, H2SO4 and NAOH after 12 hours: less than10-3% by wt
Thermal Shock Behavior: Temperature change rate should not exceed 150°C/Hr 
Maximum Temperature of use without load: 1750°C  

Components of Alumina 99.7% made by Ants have been tested with success for Ultra High Vacuum Compatibility
 
Recommended Usage:     
Ants 99.7% Alumina wares are especially useful to chemists, metallurgists, and others high temperature involved in work demanding contamination-free results. These wares are highly refractory, meant for use in reducing and oxidizing atmospheres. It is inert in hydrogen and carbonaceous atmospheres and offers high resistance to alkalies and other fluxes. Suitable for glass melting, including borosilicate glass.   

Ants has developed a number of lab and industrial solutions with Alumina 99.7 composition. However Alumina forms Low temperature eutectic with compounds of Bismuth, Lead, Silicon, Tin, Antimony and rare earths. So care has to be taken to not use Alumina wares used for heat treatment of one eutectic forming compound with another eutectic forming compound. In cases as this Ants offers a wide range of Platinum wares (Purity > 99.95%) as an alternative. 
 

Alumina 60%, 80% and 99.5%


Technical Data (Typical Value)

 

AC 60

AC 80

 

AC 99.5

 

Chemical Analysis by weight %

Al203 Min

60

80

 

99.5

SiO3 Max

35

18

 

0.20

Fe2O3 Max

0.50

0.30

 

-

Na2O Max

1

1

 

0.20

 

Physical Properties

 

 

 

 

Colour

White

White

 

Pink/Ivory/ White

Sp.Gr. – gm/cc

2.80

3.20

 

3.90

Water Absorption

0

0

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