The DURAN pressure plus GLA45 bottles offer a safer option for laboratory applications involvingvacuum or pressure. Standard glass laboratory bottles are not designed to safely withstand pressure differentials.As a result of a modified geometry the pressure plus bottles have a guaranteed pressureresistance and consequently offer optimal safety for both the user and contents. Three versions of thepressure plus bottles are available clear DURAN glass with or without a protect plastic safety coating and amber DURAN glass for protection against ultraviolet light degradation. Recommended bottle to use with the DURAN DG cap systems. Specially designed to be pressure-resistant from -1 to 1.5 bar according to ISO 4796 and garentees certified safety compliant with EN 1595. GL 45 thread.