Auer Lighting borosilicate glass SUPRAX® 8488 is a suitable material for microwave applications, e.g. as a lamp cover glass.
The measurement below shows the half-value layer for SUPRAX® 8488, a special borosilicate glass from Auer Lighting. The half-value layer is a widely used indicated value for microwave properties. It describes the depth in an absorbing material at which the power of a propagating TEM (Transversal Electro Magnetic) wave is reduced to 50% of its initial value by deposition as heat. The measurement covers the temperature range from 25 °C to 400 °C and has been taken at 2.466 GHz.
|Temperature||20 °C||400 °C|
|Dielectric constant ε’||5.1 ± 0.1||5.7 ± 0.1|
|Dissipation factor ε’’||0.050 ± 0.005||0.26 ± 0.03|
|Loss tangent||0.010 ± 0.001||0.045 ± 0.004|
|TEM half-value layer (mm)||610 ± 50||125 ± 10|
For a thin window, the fraction of the travelling wave power deposited in the window can be simply estimated by:
0.693 · window thickness
PowerFraction ≈ ____________________________
For a 3 mm thick SUPRAX® 8488 window at 20°C this gives a power deposition of ~0.3% of the magnetron output power.
In every case it is still in responsibility of the manufacturer of the microwave oven to design the product in a safe way. He has to take care for avoiding hot spots in the complete system, which will damage every glass material.
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