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Alumina Insulation Type
AL-25/1700
GENERAL INFORMATION
ZIRCAR Alumina Insulation Type AL-25/1700 insulation
is a combination of high purity alumina fibers, refractory fillers and inorganic ceramic
binders. It was developed for use as primary thermal insulation in rapid cycle
laboratory and production furnaces operating to continuous temperatures of 1700°C
(3100°F). A minimum density of 0.44 g/cc (25pcf) is maintained to
provide low thermal conductivity, good hot strength and dimensional stability.
AL-25/1700 is pre-fired, contains no organic binders and will produce no smoke or odors when heated. It has excellent resistance to chemical attack and is not affected by oil or water. They are, however, affected by hydrofluoric acid, phosphorous acid and strong alkalis.
AL-25/1700 replaced its discontinued predecessor ECO-25B. See "Sintering Wear Parts with Microwave Heating" for additional information.
CHARACTERISTICS & PROPERTIES
| Composition, wt% | |
| Al2O3 | 80 |
| SiO2 | 20 |
| Density, g/cc (pcf) | 0.44 (28) |
| Modulus of Rupture**, MPa (psi) at Room Temperature | 1.38 (200) |
| Compressive Strength, MPa (psi)** at 2% consolidation | 0.24 (35) |
| Thermal Stability, % Shrinkage after 24 hrs. at 1700°C | |
| Length and Width | 0.75 |
| Thickness | 3.0 |
| Maximum Use Temp., °C (°F), continuous | 1700 (3092) |
| Thermal Conductivity,** ASTM C177-76, W/m°K (BTU/hr ft² °F/in) | |
| 400°C (752°F) | 0.11 (0.8) |
| 800°C (1472°F) | 0.16 (1.1) |
| 1100°C (2012°F) | 0.22 (1.5) |
| 1650°C (3002°F) | 0.27 (1.86) |
| Dielectric Loss in 2.45 GHz microwave to 1400°C |
0.01 |
| * | 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. |
Primary thermal insulation in low mass furnaces and thermal process systems operating to 1720°C (3128°F).
Backup thermal insulation in furnaces and thermal process systems operating to temperatures exceeding 2000°C (3632°F).
High temperature setters, supports and process fixtures.
Electrical insulation in high temperature systems operating to 1700°C (3092°F).
AVAILABILITY
STANDARD BOARDS
|
ITEM # |
DESCRIPTION |
PRICE* |
SHIP WT. (lb.) |
|
|
A18201 |
AL-25/1700, 24in.W x 36in.L x 0.50in.T |
$544.00 |
21 | |
|
A18202 |
AL-25/1700, 24in.W x 36in.L x 0.75in.T |
$647.00 |
25 | |
|
A18203 |
AL-25/1700, 24in.W x 36in.L x 0.1.00in.T |
$758.00 |
28 | |
|
A18204 |
AL-25/1700, 24in.W x 36in.L x 0.1.50in.T |
$1025.00 |
35 | |
|
A18205 |
AL-25/1700, 24in.W x 36in.L x 2.00in.T |
$1352.00 |
42 | |
|
* 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- |
Standard boards are available for immediate shipment from stock. Standard tolerances for boards are +/- 1/8in. on length and width and +/- 1/16in. on thickness.
Boards are typically produced 24in. wide x 36in. long x ½ to 2in. 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 or larger than several cubic feet, weighing over 50 pounds, with ID’s of ¼in. to 24in., wall thickness of 1/8in. to 1in. and lengths to 48in. can be 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, AL-25/1700, 12in.W x 18in.L x 1in.T
Custom cylinders: specify quantity, product type and size. Example: 24ea, AL-25/1700, 9in.ID x 11in.OD x 22in.L
Custom boards, cylinders, shapes and preparations: specify quantity, product type and description (by supplying drawings, sketches, written descriptions or material specifications).
Copyright © 2007 ZIRCAR Ceramics, Inc.