On July 4th , 2024, Hangzhou Biyou Building Materials Technology Co., Ltd. conducted the sound insulation test. During the test, we installed various products, including the Acoustic Batwing Seal, Fire and Smoke Seal, Acoustic Perimeter Seal, Automatic Door Drop Down Seal, and Door Threshold Plates. We are pleased that these installations achieved an impressive STC acoustic isolation rating of 42.