Secure 55 Series™ 5 mm NMR Tubes

The Secure 55 Series™ NMR tubes are made from ASTM Type I Class B borosilicate glass (“high expansion” borosilicate glass such as Kimble N-51A or equivalent) and parallel the properties of the Standard Series™ NMR tubes from Norell. These tubes are ideal for near room temperature analyses of routine samples exposed only to slight thermal gradients. Due to the larger coefficient of thermal expansion of this glass type, we do not recommend fusing these NMR tubes to glass vacuum manifolds or other glass laboratory apparatus, because these are usually constructed from low expansion borosilicate glass such as Pyrex® 7740. The dissimilar thermal expansion rates of the two glass types can result in cracking or breaking of the glass-to-glass seal.