Toshiba EM925A5A-SS - Utensils and Materials Guide; Safe Utensils for Microwave Use

UTENSILS REMARKS
MATERIALS TO BE AVOIDED IN MICROWAVE OVEN
May cause arcing. Transfer food into microwave-safe dish.
Aluminum tray
Metal twist ties
May cause arcing. Transfer food into microwave-safe dish.
May cause arcing and could cause a fire in the oven.
Food carton with
metal handle
Paper bags
Plastic foam
Wood
Plastic foam may melt or contaminate the liquid inside when
exposed to high temperature.
Wood will dry out when used in the microwave oven and may
split or crack.
EN-11
May cause a fire in the oven.