A robot joint including a first robot part and a second robot part arranged to have a relative movement in between, a joint gap separating the first robot part and the second robot part from each other, and a seal arrangement for sealing the joint gap against external impact. The seal arrangement includes a first side element being part of the first robot part and immobile in relation to the same, and a gap element extending across the joint gap. One of the first side element and the gap element includes a first surface in a food grade material, and the other one of the first side element and the gap element includes a first sealing element configured to be in sliding contact with the first surface.