Manufactured from heat resistant borosilicate 3.3 glass according to DIN EN ISO 1042 standard. Calibrated by automatic robots according to DIN/ISO Class “A” standard. Conformity mark (“DE-M”) and batch number printed on the body surface. Batch certificate can be downloaded from website. Blue and white colored diamond grinded meniscus ring mark offers longer persistence. Inscriptions on the flask bodies are printed with long lasting enamel color. Neck NS size: NS 14/23
Flasks are supplied with a leak-proof P.E stopper which ensures perfect closure.