Constricted NMR tubes provide the most convenient way to flame-seal an air sensitive sample. Simply apply vacuum to the tube using our Tip-Off Manifold then heat the constricted portion and twist off; the sample is sealed in the tube. Order a constricted NMR tube by adding "CONS" to the product number of any Wilmad sample tube. Example: 507-PP-7CONS
Unless otherwise specified, constrictions are placed 1 inch from top of tube. Order tubes that are 1 inch longer than your required finished length.
Note: There is an additional charge for constriction. Please see table below, charges are per tube.