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Qualification Certificate

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Qingdao Fuyi Acoustics Ins.
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Acoustic Report
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Acoustic Report

Release time：2013-04-12　


Acoustic report of 25 mm thick sound absorption board in Institute of acoustics, Tongji University

Back space: 50 mm


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Back space 100mm

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Back space: 200 mm

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Close to the ground

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50mm thick cloth glass fiber has passed ASTM C 423 acoustic test

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