Glass fibre extraction, type MN 649, Ø outer 31 mm, H 120 mm, 25 unit(s)Glass fibre extraction, type MN 649, outer 31 mm, H 120 mm Material: borosilicate glass (fibres). Micro glass fibres consist of binding agent free borosilicate glass, temperature stable for short periods up to 500 C. The sleeves have a high chemical compatibility, a very high separation capacity and a very high particle retention capacity. Technical Information external 31 mm internal 28 mm Wall thickness 1,5 mm Height 120 mm Standards not in acc.