Complies with the standards in ISO 4796-1:2016 Laboratory glassware -- Bottles -- Part 1: Screw-neck bottles (does not apply to 10 ml bottle) Manufactured from DURAN® borosilicate glass 3.3. DURAN® is a neutral glass, classified as a Glass Type I according to USP , EP (3.2.1) and JP , and meets ASTM E438, Type I, Class A requirements Standardised GL-thread and matching cap system for particularly tight sealing and simple, clean pouring out Retrace Code, and certificate for manufacturing lot traceability Fired-on, highly durable white print Suitable for long-term storage Easy-to-read scale with graduation marks to estimate the content