Related sur Tohorot 2:4

Utensils [whose manufacture] is completed in purity -- even in the Temple Courtyard -- need to be immersed [in order to be fit to use] for consecrated foods, but not for Terumah. How is this? [Consecrated] flour that was mixed, and a tevul yom (i.e., one who has immersed but remains impure until sunset) touched a small [part] of it -- the whole is disqualified. [But] with Terumah, it is not [completely] disqualified; only the part that was touched. The ground does not join either consecrated foods or Terumah; [however,] the vessel joins with what is inside it for purposes of [disqualifying] consecrated foods, but not for Terumah. Consecrated foods [are rendered impure up to] the fourth degree, but Terumah [only up to] the third degree, and with Terumah, if one of his hands is rendered impure, the other remains pure, but with consecrated foods, both must be immersed as one. One does not immerse the pure one on its own and the impure one on its own, but rather immerses both of them as one.