Alumina Insulation Type
AL-30 & AL-30AA
Alumina Insulation Type
AL-30 & AL-30AA
GENERAL INFORMATION
ZIRCAR Alumina
Insulations Types AL-30 and AL-30AA "All-Alumina" boards are high strength,
uniform, rigid, refractory structures composed of alumina fibers and high purity
inorganic binders. Both have an optimum fiber density of 30 lbs/ft³ (0.48 gm/cc),
fine open pore structure and excellent thermal insulating properties. Type AL-30 has
superior hot strength and dimensional stability to 1600°C (2822°F) and withstands
intermittent use to 1700°C (3192°F). AL-30AA has superior resistance to chemical attack
and dimensional stability to 1500°C (2732°F).
The homogeneous microstructure and consistent binder distribution allow these materials to be machined to tight exacting tolerances with ordinary shop tools and equipment. Their superior machineability and dimensional stability plus low heat capacity make them ideal for use as setters, supports and process fixtures in both continuous and batch firing furnaces.
High purity silica is the binder in AL-30. Silica's strong bond gives AL-30 excellent high temperature strength and dimensional stability. AL-30AA "All Alumina" has a high purity alumina bond making it well suited to use in high vacuum and reducing atmosphere applications where silica cannot be tolerated, such as in bright annealing furnaces with H2 atmospheres. They both have high electrical resistivity at elevated temperatures allowing them to be used in direct contact with many different resistance heating elements.
AL-30 and AL-30AA products are pre-fired, contain no organic binders and will produce no smoke or odors when heated. They show excellent resistance to chemical attack and are not affected by oil or water. They are, however, affected by hydrofluoric acid, phosphorous acid and strong alkalis.
CHARACTERISTICS & PROPERTIES
| Type | AL-30 |
AL-30AA |
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| Typical Composition, % | |||
| Al2O3 | 85 |
97 |
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| SiO2 | 15 |
3 |
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| Organic Content | 0 |
0 |
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| Density, g/cc (pcf) | 0.48(30) |
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| Maximum Use Temperature*, °C (°F) | |||
| Continuous | 1600(2822) | 1500(2732) | |
| Intermittent | 1700(3092) | 1600(2822) | |
| Melting Point, °C(°F) | 1870(3392) |
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| Color | White |
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| Open Porosity, % | 85 |
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| Specific Heat, J/kg°K (BTU/lb °F) | 1047(0.25) |
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| Linear Shrinkage‡, % | |||
| 24 hrs. at 1500°(2730°F) | 1 |
2 |
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| 24 hrs. At 1650°(3002°F) | 3 |
8 |
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| Thermal Conductivity**, (ASTM C177-76) W/m°K (BTU/hr ft² °f/in) | |||
| 250°C (482°F) | 0.09(0.65) |
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| 525°C (977°F) | 0.12(0.85) |
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| 800°C (1472°F) | 0.16(1.10) |
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| 1075°C (1967°F) | 0.19(1.30) |
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| 1350°C (2462°F) | 0.23(1.60) |
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| 1650°C (3002°F) | 0.27(1.86) |
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| Thermal Expansion Coefficient, Room Temp. to 1000°C(1832ºf) | 5.0
x 10-6/°C (2.8 x 10-6/°F) |
7.5 x 10-6/°C (4.2 x 10-6/°F) |
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| Compressive Strength | |||
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Flexural Strength |
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| * | 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. |
Load Orientation |
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| 1 | 2 | 3 | 4 |
| Load Applied Normal To Fiber Plane |
Load Applied Parallel To Fiber Plane |
Load Applied Normal To Fiber Plane |
Load Applied Parallel To Fiber Plane |
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SUGGESTED APPLICATIONS
AL-30
Primary thermal insulation in low mass furnaces and thermal process systems operating to 1650°C (3002°F)
.Backup thermal insulation in furnaces and thermal process systems operating to temperatures exceeding 2000°C (3632°F).
Launders, distribution boxes, pouring spouts, hot tops and others involving molten metal contact.
High temperature setters, supports and process fixtures.
Electrical insulation in high temperature systems operating to 1650°C (3002°F).
AL-30AA
Primary thermal insulation in bright annealing furnaces and other thermal process systems with hydrogen gas atmospheres operating to 1550°C (2822°F).
Thermal insulation, supports and fixtures Solid Oxide Fuel Cells operating to 1550°C (2822°F).
Backup thermal insulation in furnaces and thermal process systems operating to temperatures exceeding 2000°C (3632°F).
Launders, distribution boxes, pouring spouts, hot tops and others involving molten metal contact.
High temperature setters, supports and process fixtures for use in reducing atmospheres.
Electrical insulation in high temperature systems operating to 1550°C (2822°F).
AVAILABILITY
STANDARD BOARDS
| ITEM # |
DESCRIPTION |
PRICE* | SHIP WT. (lb.) | |
| A11013 | AL-30, 24in.W x 48in.L x 0.50in.T | $1467.00 | 25 | |
| A11014 | AL-30, 24in.W x 48in.L x 0.75in.T | $1763.00 | 30 | |
| A11015 | AL-30, 24in.W x 48in.L x 1.00in.T | $2045.00 | 35 | |
| A11016 | AL-30, 24in.W x 48in.L x 1.50in.T | $2639.00 | 45 | |
| A14013 | AL-30AA, 24in.W x 48in.L x 0.50in.T | $1364.00 | 25 | |
| A14014 | AL-30AA, 24in.W x 48in.L x 0.75in.T | $1751.00 | 30 | |
| A14015 | AL-30AA, 24in.W x 48in.L x 1.00in.T | $1929.00 | 35 | |
| A14016 | AL-30AA, 24in.W x 48in.L x 1.50in.T | $2571.00 | 45 | |
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* Note: Prices shown apply to sales within the United States. Contact us for information regarding international commerce. |
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To place your order, please click the respective "ORDER" button next to the item you wish to purchase. To view your shopping cart click the button to the right. For more info -click here- |
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Standard boards and cylinders are available for immediate shipment from stock. Standard tolerances for boards are +/- 1/8in. on length and width and +/- 1/16in. on thickness. Standard tolerances for cylinders are +/- 1/16in. on diameters and +/- 1/8in. on length.
Nested cylinders are available on request.
Boards are typically produced 24in. wide x 48in. long x ½ to 1½in. thick. Custom boards and shapes smaller than a few cubic inches and larger than a cubic foot in volume have been manufactured.
Cylinders typically produced have 1in. to 12in.ID, ½in. to 1in. wall thickness and are up to 20in. long. Custom cylinders and shapes smaller than a few cubic inches, larger than several cubic feet, weighing up to 100 pounds, with ID’s of ¼in. to 24in., wall thickness of 1/8in.’ to 2in. and lengths to 48in. 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
Standard boards and cylinders: order online or specify quantity, item # and description.
Custom boards: specify quantity, product type and size. Example: 24ea, AL30-AA, 22in.W x 31.5in.L x 1in.T
Custom cylinders: specify quantity, product type and size. Example: 24ea, AL30, 12in.ID x 14in.OD x 15in.L
Custom boards, cylinders, shapes and preparations: specify quantity, product type and description (by supplying drawings, sketches, written descriptions or material specifications).
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Copyright © 2006 ZIRCAR Ceramics, Inc.
