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Advice on the use of Cookware
Metal
Do not use metal dishes, tinned food, food wrapped in tin foil and cutlery inside the microwave
oven. The metal reflects the microwaves and food is not heated.
The food should be removed from its tin foil containers and placed in dishes adequate for use in
the microwave oven. As microwaves don't penetrate tin foil, the food heats only on the surface.
By using appropriate dishes, the heat is evenly distributed throughout the food.
EXCEPTIONS:
To cook or defrost pieces of meat of irregular sizes, you may cover the thinner parts with tin foil,
which should be kept at least 2 cm away from the oven walls, otherwise these may cause an
electric arc.
Metal spits may be used as long as they are smaller than the pieces of meat.
Glass
All heat proof glass containers may be used.
Crystal contains a percentage of lead, which may cause it to crack if used in the microwave oven.
The same may happen to glass dishes with jagged edges.
Porcelain
Porcelain dishes may be used but they should not have hollow handles. Humidity may be formed
inside the hollow handles, which will causes an increase in pressure that may cause them to
break.
Glazed Ceramic Dishes
This type of dish may heat considerably.
Painted glazed ceramic dishes may be used if the painting is done under the glaze.
Many glazes and colours contain metallic substances. If this is the case they should not be used
in the microwave as they may be damaged.
Recipients with silver and gold glazes may go dark.
Plastic
Plastic dishes should be heat resistant (at least 180° C) or they may be deformed when used in
the microwave. Melamine dishes are not suitable for use in the microwave as they heat up too
much.
To cook or heat food in plastic bags, they should be perforated to allow vapour to escape thus
preventing the bag from bursting.