ZIRCAR Ceramics: AL-30AAH

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102.jpg (3709 bytes) Alumina Insulation Type AL-30AAH

GENERAL INFORMATION
ZIRCAR Ceramics Alumina Cylinders Type AL-30AAH are high strength, uniform, rigid, refractory structures composed of alumina fiber and high purity alumina binder. AL-30AAH is composed of 98.4% Alumina Oxide existing predominantly as alpha Al₂O₃ and contains no free silica. It has a uniform density of 32 lbs/ft³ (0.51g/cc) density.

AL-30AAH has outstanding stability and hot strength. The uniformly bonded, fine, open-pore structure enables AL-30AAH to be cut and readily machined to close tolerances. AL-30AAH Cylinder's high alumina content and high purity alumina bond make it ideal for high vacuum or reducing atmospheres, metal vapor laser insulation and other application where silica cannot be tolerated.

There materials show excellent resistance to chemical attack and are not affected by oil or water. They are however effected by hydrofluoric acid, phosphoric acid and strong alkalis. AL-30AAH products are prefired to an extremely high temperature, contain no organic binders and produce no outgassing, smoke or odors when heated.

CHARACTERISTICS & PROPERTIES

Typical Composition, %
Al₂O₃	98.4
SiO₂	1.6
Typical Impurities, %
Na₂O	0.03
CaO	0.02
Other Metal Oxides	0.04
Bond	Alumina
Density, g/cc (pcf)	0.51 (32)
Open Porosity, %	84
Maximum Use Temperature*, °C (°F)	1700 (3092)
Melting Point, °C (°F)	1870 (3392)
Color	White
Specific Heat, BTU/lb°F (J/kg°K)	0.25 (1047)
Linear Shrinkage, %, 1 hr at 1650°C (3002°F)
Length	0.2
Width	0.6
Volume	1
Thermal Conductivity, ** ASTM C177-76 W/m°K (BTU/hr ft² °F/in)
250°C (482°F)	0.09(0.65)
525°C (977°F)	0.12 (0.85)
800°C (1472°F)	0.16 (1.10)
1075°C (1967°F)	0.19 (1.30)
1350°C (2462°F)	0.23 (1.60)
1650°C (3002°F)	0.27 (1.85)
Thermal Expansion Coefficient, room temp. to 1000°C (1832°F)	7.5x10^-6/°C (4.2x10^-6/°F)

*	Maximum use temperature is dependent on variables such as stresses, both thermal and mechanical, and the chemical environment that the material experiences.
**	Properties expressed parallel to thickness.
‡	Properties expressed perpendicular to thickness.

SUGGESTED APPLICATIONS

Primary thermal insulation in Copper Discharge Lasers operating to 1600°C (2912°F).

Primary thermal insulation in low mass furnaces and thermal process systems operating to 1700°C (3092°F) with vacuum, reducing, or inert, or other application where the absence of silica is desired.

High temperature setters, supports and process fixtures.

Launders, distribution boxes, pouring spouts, hot tops and others involving molten metal contact.

Backup thermal insulation in furnaces and thermal process systems operating to temperatures exceeding 2000°C (3632°F).

Electrical insulation in high temperature systems operating to 1700°C (3092°F)

MATERIAL SAFETY DATA SHEET

AVAILABILITY

Boards are typically produced to 14" wide x 14" long x ½ to 2" thick. Custom boards and shapes smaller than a few cubic inches in volume have been produced.

Cylinders typically produced have 1" to 12"ID, ½" to 1" wall thickness and are up to 36" long. Custom cylinders and shapes smaller than a few cubic inches with ID’s of ¼" to 12", wall thickness of 1/8"’ to 1 1/4" and lengths to 48" have been manufactured.

Custom boards, cylinders, shapes and preparations are available on request. Our forming processes, large inventory of custom tooling and state of the art machining techniques allow a wide variety of sizes and shapes to be made. Special geometries such as disks, rings, custom bore (round corner square, hexagonal, oval, etc.) cylinders, staved cylinders, troughs, channel, angle, custom-machined shapes and others can be fabricated. Machining to tight tolerance, compositional variations and the application of surface rigidizers and hardening agents are available.

Please contact us with your special requirements. We are pleased to contact you if you would like more information or want to discuss custom product availability and pricing.

To Order

Custom boards: specify quantity, product type and size. Ex: 24ea, AL30-AAH, 12"W x 13.5"L x 1.5"T

Custom cylinders: specify quantity, product type and size. Ex: 24ea, AL30-AAH, 3.36"ID x 5.25"OD x 24"L

Custom boards, cylinders, shapes and preparations: specify quantity, product type and description (by supplying drawings, sketches, written descriptions or material specifications).