Plastics
Plastic dishes, cups, mugs and bowls may be used in the oven for short periods of time. None of these should be used in the oven for prolonged periods because distortion and melting may occur.
Check manufacturer's recommendations concerning microwave safety.
Plastic wrap can be used to cover dishes in most recipes if the dish is deep enough to avoid plastic wrap touching the food. Always vent the wrap by folding back one corner to allow excess steam to escape.
Plastic cooking bags should be slit before cooking so excess steam can escape.
Do not use wire twist ties to close the bag. Wire twist ties can cause arcing which can damage the oven.
Paper
Paper cups, wax paper, napkins, paper towels, and plates may be used for short cooking. Prolonged time in the oven can cause paper to burn. Do not use recycled paper products, such as brown paper bags. They contain impurities which may cause arcing and damage the oven.
Metal
Metal utensils should not be used in the oven. Metal reflects microwave energy so foods will not cook so foods will not cook evenly.
Metal can cause arcing and damage the oven.
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