in order to be used in a microwave oven, the containers must be of a material, which allows microwave to pass through it to the food. The materials fit for are as follows:
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China and pottery, ovenproof glass and glass ceramic dishes are perfectly suitable for microwave cooking.
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However, fine bone china and ordinary glass should be used for short periods only, as they would crack with excessive heat.
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Paper cups, cartons, cling films and thermo plastics are suitable for microwave cooking.
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Metal or foil containers should never be used as these reflect the microwaves.
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Melamine ware also tends to crack when heated.