Microwave Accessory Shelf
Your shelf accessory is made of polysulfone, one of the strongest microwave ovenproof plastics. It is designed for use in a microwave oven only. Do not use it in a conventional oven and do not operate your microwave oven with a shelf in place unless you have food in the oven.
Never use a microwave-browning dish with the shelf. Heat from the browning dish can damage the shelf. The easy way to clean the shelf is to put it in a dishwasher or to wash it in hot water with mild detergent. Do not use abrasive cleaners or scouring pads.
A microwave should never be run while it is empty.