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Alumina/Silica/Boria ( Al2O3 62/SiO2 24/B2O3 14 )

Material Information

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We stock and supply the following standard forms:
Fabric Fiber
Fabric Fiber

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Common Brand Names:
Nextel® 312
 
General Description:  

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.

   

Chemical Resistance

Acids - concentrated Fair
Acids - dilute Good
Alkalis Poor-Fair
Metals Good

Electrical Properties

Dielectric constant 5.2 @ 9.4GHz

Mechanical Properties

Tensile modulus ( GPa ) 140

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 2.7
Refractive index 1.57
Water absorption - saturation ( % ) 0

Thermal Properties

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

Buy Alumina/Silica/Boria on-line

We stock and supply the following standard forms:
Fabric Fiber
Fabric Fiber

Choose a form to search our on-line catalog  

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