Miele 11 196 580 Operating And Installation Instructions page 15

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Non-microwave-safe plastic dishes can suffer damage or damage
the oven if used with the Microwave  function and microwave
functions.
Do not use any crockery or cutlery made from or containing metal,
aluminium foil, lead crystal glassware, temperature-sensitive plastics,
wooden utensils or cutlery, metal clips, or plastic or paper-covered
wire ties. Do not use bowls with milled rims, or plastic pots with the
foil lid only partially removed (see the requirements specified for
crockery in the section on microwave operation).
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Plastic dishes that are not suitable for use in an oven will melt and
may ignite at high temperatures, and can damage the oven.
Use only plastic dishes that are suitable for use in an oven when
using functions that do not use microwave power. Follow the
manufacturer's instructions.
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Fire hazard due to containers made of flammable materials.
Plastic disposable containers must meet the requirements specified
for crockery in the section on microwave operation.
Do not leave the oven unattended when heating or cooking food in
disposable containers made of plastic, paper or other inflammable
materials.
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Heat-retaining bags usually contain a thin layer of aluminium foil
that reflects microwave radiation. This reflected energy can, in turn,
cause the outer paper covering to become so hot that it ignites.
Do not use heat-retaining packaging, such as bags for grilled chicken,
for warming food with functions that use microwave power.
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If the oven is used without food or the food is loaded incorrectly
when using the Microwave  function or functions that use
microwave power, the oven can become damaged.
Do not use any functions that use microwave power to preheat
crockery or to dry herbs.
Instead, use the Fan plus  or Conventional heat  function.
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Heating up food in closed containers, such as tins or sealed jars,
will result in an increase in pressure, which can cause them to
explode. Do not heat up unopened tins or jars of food in the oven.
Warning and safety instructions
15