Abstract
Recent attempts to seal MAS rotors for obtaining CP/MAS spectra of air-sensitive materials and/or liquids and gels have involved either heat sealing glass inserts (1, 2) or machining Kel-F inserts that require heat fusing a machined cap to the rotor top (3). Heat sealing of glass inserts presents problems when volatile solvents are used due to the proximity of the heat source to the sample (3). While easily machinable, the Kel-F inserts are not easily formed and sealing using a hot rod on the insert cap may not be complete. We report the design and use of a glass MAS rotor insert that uses an epoxy sealant, not heat sealing, and can be obtained commercially to fit a variety of rotor designs. Figure 1 shows that the Pyrex MAS rotor insert (Part No. SK-2 133, Wilmad Glass Co.) for the double-bearing Kel-F (Chemagnetics Inc.) rotors used in a M-100s 13C
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