Efficiency assured by rigid bakeout and evacuation control (evacuated to 10-5 torr or better). Evacuation tip completely shielded for increased protection. Weighted bases on all models for stability. Optional full length metal housing on most models for added protection. No pads between walls on cylindrical dewars eliminating this heat transfer potential. Supplied polyethylene stopper tops off dewars to minimize evaporation. Holding time 2-6 hours depending on volume. Pope Lab Grade Dewars are rated the most efficient glass dewars in the world. Designed for use with liquid nitrogen, this superior ranking is due to rigid quality controls in manufacture and a number of outstanding design and manufacturing features. The protective aluminum bases on both styles extend the full height of the dewars. Note that protected vacuum tip-off tubulations are offset to the side to minimize space between the dewar bottoms and magnetic stirrers. PART# Dewar Description Type Model Protective Covering ID mm Inside Depth mm OD mm Total Height mm 81740-50 350mlStandard Base Cylindrical,Wide Mouth Lab Grade Mesh 70 125 86 157 81740-50-5 350mlFull Base Cylindrical,Wide Mouth Lab Grade Full Aluminum 70 125 86 157 81740-60 665mlStandard Base Cylindrical,Wide Mouth Lab Grade Mesh 70 195 86 241 81740-60-5 665mlFull Base Cylindrical,Wide Mouth Lab Grade Full Aluminum 70 195 86 241 81740-70 1000mlStandard Base Cylindrical,Wide Mouth Lab Grade Mesh 70 302 86 337 81740-70-5 1000mlFull Base Cylindrical,Wide Mouth Lab Grade Full Aluminum 70 302 86 337 Standard Base Standard Wide Mouth Cylindrical DewarsThese Dewars exemplify the emphasis placed on both efficiency and safety by Pope Scientific. All Pope Lab Grade Dewars are manufactured of borosilicate glass for liquid nitrogen service. A sturdy mesh cover facilitates a firm grip, provides a cushion against bumping and increases protection. Holding time 2-6 hours depending on volume. Full Base Full Length Aluminum Housing Cylindrical DewarsAll Wide Mouth models can be obtained with an exterior metal housing that extends nearly to the top rim of the Dewar (a slight extension of the glass dewar facilitates pouring). This housing adds the safety of metal to the efficiency of glass, particularly important in handling operations. Holding time 2-6 hours depending on volume.
