1PCS 5/10/25/50/100ml glass screw colorimetric tube, screw glass pressure bottle for labDiscription:Item: colorimetric tubeMaterial: High borosilicate glassProduct feature:The thick-walled cylindrical pressure-resistant bottle is internally threaded and equipped with a 15mm (outer diameter) PTFE threaded sealing cap. It is tested at the factory for pressure and can withstand a pressure of 6 atmospheres. The top of the threaded cap is fitted with an O-ring, which can be used for pressurization reactions.Note: Fluoroglue gasket is resistant to high temperature, but it is very easy to age when used under high temperature. It needs to be replaced after aging!