The Select series includes tubes of ASTM Type 1 Class A borosilicate glass. They are compatible with the Pyrex ® 7740 (Corning), Duran ® (Schott Glass) and Kimax ® KG-33 (Kimble) tubes.
The Select series is designed specifically for the NMR devices with high spatial resolution. Its glass quality is very resistant to big thermal shocks and has a low thermal expansion coefficient.
These features provide versatility without breaking the pipes. This is particularly useful when used within highly varying temperatures as well as within cooling-thaw cycles.
The Standard series of tubes is made according to the ASTM Type 1 Class B borosilicate glass, which is generally referenced as 51A-N for glass products. This type of glass application includes the routine NMR measurements, where samples are run at room temperature without any major fluctuations in temperature. Therefore, the glass melt is not recommended, for example, because they are made of Type 1 class A glass.
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