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Formula: Al₂O₃ 99.9
Form: Filament
Material: Sapphire
CAS Number: 1344-28-1
Commodity: Ceramics
Type: Structural
Sapphire Filament is a product offered by Goodfellow within its range of filaments. With 57 variations available, this filament provides a combination of high strength, hardness, and chemical resistance. The sapphire crystal structure makes this material ideally suited for applications requiring durability under extreme environments. Potential uses include high temperature sensors, semiconductor processing equipment, and thread guides for textile manufacturing. With its unique properties, the Sapphire Filament expands Goodfellow's selection of specialized filaments for demanding applications.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

Filament
Diameter ±20%
Length +5% / -1%

Material Properties for Ceramics

Chemical Resistance
Element Value
Acids - concentrated Good
Acids - dilute Good
Alkalis Good
Halogens Good
Metals Good
Electrical Properties
Element Value
Dielectric constant 7.5-11.5
Dielectric strength( kV mm⁻¹ ) 15-50
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Refractive index 1.71-1.79
Useful optical transmission range 200-5500nm
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.985
Thermal Properties
Element Value
Melting point( C ) 2050
Upper continuous use temperature( C ) 1800-1950
Specific heat( J K⁻¹ kg⁻¹ ) 750@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 35-40@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 5.8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 350-390
Hardness - Knoop( kgf mm⁻² ) 2000
Hardness - Vickers( kgf mm⁻² ) 1600-1800
Tensile strength( MPa ) 250-400
Pultrusions
Element Value
Compressive strength( MPa ) 2100

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