Cookware
Microwave-
safe
Fast-food
packaging
• Polystyrene
✓
cups/containers
• Paper bags or
✗
newspaper
• Recycled paper
✗
or metal trims
Glassware
• Oven-to-table
✓
ware
• Fine glassware
✓
• Glass jars
✓
Metal
• Dishes, Utensils
✗
• Freezer bag
✗
twist ties
Paper
• Plates, cups,
✓
napkins and
kitchen paper
• Recycled paper
Comments
Can be used to warm food. Overheating
may cause the polystyrene to melt.
May catch fire.
May cause arcing.
Can be used, unless decorated with a metal
trim.
Can be used to warm foods or liquids.
Delicate glass may break or crack if heated
suddenly.
Regular glass is too thin to be used in a
microwave, and can shatter.
May cause arcing or fire.
For short cooking times and warming. Also
to absorb excess moisture.
Do not use recycled paper towels, which
may contain metal and may catch fire or
cause arcing.
Cookware
Microwave-
safe
Plastic
• Containers
✓
• Cling film
✓
• Freezer bags
✓✗
Wax or grease-
✓
proof paper
Thermometer
✓
Straw, wicker, and
✓✗
wood
: Recommended
: Use caution
✓
✓✗
Comments
Can be used if heat-resistant thermoplastic.
Some plastics may warp or discolor at high
temperatures. Do not use Melamine plastic.
Can be used to retain moisture. Avoid
wrapping the food too tightly. Take care
when removing the film as hot steam will
escape.
Only if boilable or oven-proof. Should not
be airtight. Prick with a fork, if necessary.
Can be used to retain moisture and prevent
spattering.
Use only those marked "Microwave-
safe" and follow the directions. Check the
temperature in several places. You can use
conventional thermometers once the food
has been removed from the oven.
Use only for short-term heating, as these
materials can be flammable.
: Unsafe to use / Do not
✗
English 19