Abstract: A conveyor for heat treating furnaces including a plurality of heat insulating elements mounted on a conveyor roller-chain assembly and arranged side-by-side along the conveyor path through the furnace. Articles to be heat treated are supported on the insulating elements for movement by the conveyor through the furnace. The insulating elements are of ceramic fiber heat insulating material of relatively low density and low heat storage capacity. The material of the elements is flexible and has resiliency, and the elements initially are resiliently compressed against each other so as to remain in side-by-side contact even after subsequent heat shrinkage.