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Alumina Washer

Alumina Washer are ceramic washers offered by Goodfellow within its extensive range of bolts and fasteners. With 101 size variations, these washers provide high hardness and compressive strength. Alumina Washer are electrically insulating and chemically inert, making them ideal for applications in corrosive environments. They also have high thermal conductivity, allowing them to dissipate heat in electronic components. Alumina's hardness and low friction make these washers suitable for high-wear applications.
Formula: Al₂O₃
Thickness: 0.8mm
Outside Diameter: 8.85
Inside Diameter: 4.40
Quantity: 25 Pcs
Standard: BS4320:1968
Size: M4 (BS4320)
CAS Number: 1344-28-1
UOM Code: 040-880-88
SKU: 1000005523
Product Code: AL60-WA-000154

Tolerances

Washer
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Tolerances

Washer
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Technical Data Sheet
Safety Data Sheet
€363.16
each
  • Buy 5 for €294.16 each and save 19%
  • Buy 10 for €268.74 each and save 26%
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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 9-10.1
Dielectric strength( kV mm⁻¹ ) Oct-35
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.9
Thermal Properties
Element Value
Melting point( C ) 2100
Upper continuous use temperature( C ) 1700
Specific heat( J K⁻¹ kg⁻¹ ) 850-900@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 26-35@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 300-400
Hardness - Knoop( kgf mm⁻² ) 2100
Hardness - Vickers( kgf mm⁻² ) 1500-1650
Shear strength( MPa ) 330
Tensile strength( MPa ) 260-300
Pultrusions
Element Value
Compressive strength( MPa ) 2200-2600
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