In article >,
Walter Spector > wrote:

> They roll on bearings to make it easier to work with heavy pots
> and roasters. Very nice feature.
>
> For example, Dacors version:
>
> http://www.dacor.com/Our-Products/Ac...en-Glide-Racks.
> aspx
>
> And Vikings version:
>
> http://www.vikingrange.com/consumer/...id=prod4690185
>
> If you use self-clean on one of these, you will have just ruined
> a $200 rack.

The bearings onside those racks are sealed bearings, that is that
nothing can get in or out. Within those seals, the bearings have a high
heat resilient lubricant, most likely a synthetic lube. However, the
very high heat achieved in most self-clean cycles is sufficient to break
down these lubricants, which is why they would be ruined after being
cleaned like that. In addition, the lubricants can potentially boil,
and in turning vaporous, they can breach the seal and leak. And if they
do leak, the smoke could be significant.

jt