Alumina/Silica/Boria ( Al2O3 62/SiO2 24/B2O3 14 ) - Material Information
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General Description:
Common Brand names :Nextel® 312
Nextel® 312 and Nextel® 440 are two similar materials - compositions of ceramic specially developed for the production of continuous filament yarns which are sufficiently flexible to manufacture conventional textile articles such as fabrics and sewing threads whilst retaining much of the high temperature and chemical resistance typical of ceramics. Nextel® 440 has somewhat better tensile properties and higher upper working temperature but is less flexible than Nextel® 312. Nextel® 312 is available from Goodfellow as a yarn, a narrow fabric and sewing thread sizes. Sewing threads are made from individual yarns, known as "singles", wrapped around the outside with rayon and then twisted together in two stages to give a balanced, non-snarl, construction. The rayon comprises about 20% of the initial weight of the thread and will "burn" out by about 300C if/when the sewn article is subsequently heated.
The fibers are coated with finishes during manufacture which can be removed, if desired, by "heat cleaning" at about 550C. If the best possible properties are required, further heat treatment at about 920C should be used. More details of the recommended methods of treatment are available on request.
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Chemical Resistance
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| Acids - concentrated | Fair |
| Acids - dilute | Good |
| Alkalis | Poor-Fair |
| Metals | Good |
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Electrical Properties
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| Dielectric constant | 5.2 @ 9.4GHz |
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Mechanical Properties
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| Tensile modulus ( GPa ) | 140 |
| Tensile strength ( MPa ) | 1700 |
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Physical Properties
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| Apparent porosity ( % ) | 0 |
| Density ( g cm-3 ) | 2.7 |
| Refractive index | 1.57 |
| Water absorption - saturation ( % ) | 0 |
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Thermal Properties
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| Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) | 3 |
| Specific heat @25C ( J K-1 kg-1 ) | 1100 |
| Sublimation point ( C ) | 1800 |
| Upper continuous use temperature ( C ) | 1200-1400 |
Properties for Alumina/Silica/Boria Fiber
| Property |
Value |
| Coefficient of thermal expansion - Longitudinal | x10-6 K-1 | 3.0 |
| Density | g cm-3 | 2.7 |
| Extension to break | % | 1.2 |
| Modulus | GPa | 140 |
| Tenacity | GPa | 1.7 |
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Goodfellow Cambridge Limited
Ermine Business Park
HUNTINGDON
PE29 6WR
England
Tel: 011 44 1480 424 800
or 011 44 1480 424 800
Fax: 011 44 1480 424 900
or 011 44 1480 424 900 Email us at : info@goodfellow.com |
Goodfellow GmbH
Postfach 13 43
D-61213 Bad Nauheim
Germany
Tel: 0800 1000 579 (freecall)
or +44 1480 424 810
Fax: 0800 1000 580 (freecall)
or +44 1480 424 900 |
Goodfellow Corporation
PA 15071-3911
305 High Tech Drive
Oakdale.
USA
Tel: 1-800-821-2870 (USA and Canada)
or +1 724 695 7060
Fax: 1-800-283-2020 (USA and Canada)
or +1 724 695 7063 |
Goodfellow SARL
229, rue Solférino
F-59000 Lille
France
Tel : 0800 917 241 (numéro vert)
or +44 1480 424 813
Fax : 0800 917 313 (numéro vert)
or +44 1480 424 900 |
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