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The formation of thread-like structures instead of droplets has been observed in recent studies on the injection of various gels and nonNewtonian §uids through a doublet impinging jet injector. In the present work, it has been studied if a correlation can be found between distinct §uid properties and thread formation. For this task, the tests have been conducted with di¨erent classes of §uids with various §uid properties. These classes are: Boger §uids, linear and crosslinked polymer solutions, and silica suspensions. The results show that a correlation exists between thread formation and the extensional behavior of the §uid, in particular, high values of the Trouton ratio. The characterization of the extensional behavior of §uids with a distinct yield stress has been conducted with a capillary rheometer, and the results obtained with this technique are compared to the spray behavior.