Pressure and vacuum resistant glass laboratory bottles.– Guaranteed vacuum and pressure resistant from –1 bar to + 1.5 bar due to modified geometry (based on ISO 4796-1) – The special geometry still conforms to ISO 4796-1:2016 to maintain instrument compatibility – Optimum safety for working under pressure or vacuum – Suitable for use under a perfect vacuum (100%) 0 torr, 0 psia or 0 Pa absolute – Pressure resistance conforms to DIN EN 1595 – Fired-on, highly durable blue ceramic print for visual differentiation from the standard laboratory bottle – Easy-to-read scale with graduation marks to estimate the content – Standardised GL-thread and matching cap system for particularly tight sealing and simple, clean pouring out Pressure and vacuum resistant glass laboratory bottles.– Guaranteed vacuum and pressure resistant from –1 bar to + 1.5 bar due to modified geometry (based on ISO 4796-1) – The special geometry still conforms to ISO 4796-1:2016 to maintain instrument compatibility – Optimum safety for working under pressure or vacuum – Suitable for use under a perfect vacuum (100%) 0 torr, 0 psia or 0 Pa absolute – Pressure resistance conforms to DIN EN 1595 – Fired-on, highly durable blue ceramic print for visual differentiation from the standard laboratory bottle – Easy-to-read scale with graduation marks to estimate the content – Standardised GL-thread and matching cap system for particularly tight sealing and simple, clean pouring out