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. Wholesale Acoustic Door Drop Seal website:http://www.firestopchina.com/