Is ritual purity required for wiping over a cast?

Question:
May Allah reward you, Your Eminence, father. The questioner asks: Is ritual purity required for applying a cast? And how does one wipe over it if it is on the foot and part of the foot is exposed?

Answer:
It is not required to be in a state of ritual purity when applying a cast. This is one of the differences between it and leather socks. If one applies it while not in a state of ritual purity, he wipes over it. Also, it does not have a time limit like leather socks; rather, he wipes over it as long as he needs it to remain, even if the period is long. It has no specific time. As for the case where it is on part of a limb, he washes the sound part of the limb and wipes over the cast that is over the wound. He washes the healthy part and wipes over the injured part. Yes.