Assertion: thickness | /r/CapableOf | offer less than 1 db of shielding
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Source sentences:
text: Aluminium foil is about 1 mil (25 μm); a thickness of 10 mils (250 μm) (ten times thicker) offers less than 1 dB of shielding at 1 kHz, about 8 dB at 10 kHz, and about 25 dB at 100 kHz.