... Mineral fiberwith NBR rubber,synthetic rubber,oil-resistant rubber,acid-resistant rubber Compressed andcalendered under high temperature and pressure ... . Used in steam, water, air & various oil, alkaline,acid and chemicals.ItemWXB250WXB350WXB450Tensilestrength≥6 Mpa≥ 12 Mpa≥19 MpaAging coefficient ... -resistant available.2. Non asbestos joint sheet acid-resistant available Non Asbestos Joint Sheets