Hangzhou Biyou Building Materials Technology Co.,Ltd specialized in manufacture a wide range of weather sealing system and passive fire products. Our products are idea for fire resistance, insulation, smoke sealing and acoustic suppression. We has a group of professional R & D, high-quality products and efficient after-sales service. We have achieved IS9000 certificate, BS/EN/UL Certificate approved by Intertek and other international testing institutions. Most of our 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.