Does one need to do tevilas keilim on a disposable aluminium foil pan?
If a disposable pan is used only once, it does not require tevillah.
Even if it will be used more than once, it does not require tevillah, provided it will only be used twice or three times before being disposed of, and not on a “permanent” basis.
See Minchas Yitzchak 32:1; Iggros Moshe, Yoreh De’ah 3:23; Tevillas Keilim chap. 1, note 10; the pan remains essentially disposable, and the fact that it is used more than once does not, according to most authorities, make a difference. Some, it should be noted, are stringent, and require tevillah when the pan is used more than once (Mishnah Halachos 7:111).