Proprietà
meccaniche
The tensile strength of
quartz glass can reach up to 50 N/mm². In practice, however,
this value is clearly lower. The reasons are primarily the
number and concentration of surface defects, which, in
combination with atmospheric influences, such as moisture,
reduce the tensile strength. Even the geometry of a quartz glass
piece plays a role. The surface condition of quartz glass is of
great significance. As the probability for mechanical defects
increases with the surface area, the tensile strength of quartz
glass is a function of its size. Even the type of surface
treatment and the age of quartz glass influence its properties.
By fire-polishing, for example, the quality of the quartz glass
surface is improved.
Technical Properties of
Mechanical Data |
 |
Electrical
Fused
Quartz
|
Flame
Fused
Quartz
|
Fused
Silica
|
Density |
g / cm³
|
2.203
|
2.203
|
2.201
|
Mohs Hardness |
|
5.5 ... 6.5
|
5.5 ... 6.5
|
5.5 ... 6.5
|
Micro Hardness |
N / mm²
|
8600 ... 9800
|
8600 ... 9800
|
8600 ... 9800
|
Knoop Hardness |
N / mm²
|
5800 ... 6000
|
5800 ... 6000
|
5800 ... 6200
|
Modulus of elasticitiy
(at 20°C) N / mm² |
|
7.25·104
|
7.25·104
|
7.0·104
|
Modulus of torsion |
N / mm²
|
3.1·104
|
3.1·104
|
3·104
|
Poisson´s ratio |
|
0.17
|
0.17
|
0.17
|
Compression strength
(approx.) |
N / mm²
|
1150
|
1150
|
1150
|
Tensile strength
(approx.) |
N / mm²
|
50
|
50
|
50
|
Bending strength
(approx.) |
N / mm²
|
67
|
67
|
67
|
Torsion strength
(approx.) |
N / mm²
|
30
|
30
|
30
|
Sound velocity |
m / s
|
5720
|
5720
|
5720
|
|
Applicazioni
specifiche >>
Proprietà del vetro di quarzo
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