Hangzhou Biyou Building Material Technology Co., Ltd is an International sales office, the self-support factory based on Jiashan county Jiaxing city, zhejiang province China and the R&D department based on Sweden. We specialized in manufacture a wide range of weather sealing systems and passive fire protection products. Our products are idea for fire resistance, insulation, smoke sealing and acoustic suppression. We have achieved IS9000 certificate, BS/EN/UL Certificate approved by Intertek and other international testing institutions. All products comply with requirements of BS476 part 20-22 and EN BS 1634-3, EN BS13501-2, UL 10C (2009). We have exporting to Europe, American, Asia, Middle East as well as other countries. Welcome the inquiries from all of the customers. China Acoustic And Drauht Seal manufacturers website:http://www.firestopchina.com/