With premium product quality and 18 years efforts, GNS becomes the market leader in PU foam and Silicone sealant industry. At the same time, GNS has established a professional laboratory and introduced advanced testing equipment. From raw materials to finished products, they will undergo strict quality testing to ensure that the products produced and shipped can meet customer requirement and guarantee the reliability of the products. GNS has been accredited to ISO9001:2015 and ISO14004:2015. GNS product meet European Standard, British Standard, German Standard which are all certified by TUV Rheinland. Beside, GNS is the National approval and recommended manufacturer from structural sealant ans weatherproof sealant.