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Materials that cannot be used in a microwave oven
Cookware
Comments
Aluminium tray
May cause an electric arc. Transfer food to microwave-safe cookware.
Cardboard carton with metal
handle
May cause an electric arc. Transfer food to microwave-safe cookware.
Metal or cookware with metal
frame
Metal shields the food from microwave energy. Metal frame can cause an
electric arc.
Metal closure - tightened
May cause an electric arc and fire in the oven.
Paper bags
May cause a fire in the oven.
Plastic foam
Plastic foam may melt or contaminate the liquid in it when exposed to high
temperatures.
Wood
Wood dries out when it is heated in the microwave oven and can crack or
break.
Materials that can be used in a microwave oven
COOKWARE
Cookware
Comments
Aluminium foil
Only as shielding. Small and smooth pieces can be used for the coating of thin pieces of
meat or poultry, to prevent excessive cooking. Arc discharge may occur if the foil is too
close to the oven walls. Film must be at least at a distance of 2.5 cm from the oven walls.
Browning plate
Observe the manufacturer’s instructions. The bottom of the browning plate must be at
least 5 mm above the turntable. Improper use may cause cracking of the turntable.
Dinner dishes
Suitable for microwave ovens only. Observe the manufacturer’s instructions. Do not use
cracked or chipped cookware.
Glass jars
Always remove the lid. Use only for heating food to a suitable temperature. Most glass
jars are not heat resistant and may explode.
Glassware
Use only heat-resistant glassware in the microwave oven. Make sure that there are no
metal frames. Do not use cracked or chipped cookware.
Bags for microwave
cooking
Observe the manufacturer’s instructions. Do not seal with metal clamps.
Paper plates and cups Cut through to allow the steam to escape. Use only for short cooking / heating. Do not
leave the oven unattended while cooking.
Paper towels
Use to cover food to be heated to absorb fat. Use only for short cooking under constant
surveillance.
Parchment paper
Use as a cover to prevent splashing or as a container for evaporation.
Plastics
Suitable for microwave ovens only. Should be labelled "for use in microwave ovens."
Some plastic containers soften when the content is warmed up. Bags for microwave
cooking and sealed plastic bags must be pierced or incised, or vented according to the
directions on the package.
Plastic packaging
Suitable for microwave ovens only. Use to cover food during cooking in order to maintain
moisture. Do not let plastic packing touch the food.
Thermometers
Suitable for microwave ovens only (thermometers for meat and sugar).
Wax paper
Used as a covering to prevent splashing and to keep moisture.
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