From July 2019, Ecoffee Cup® sold in black boxes (see photo) can be used in microwave.
Microwave should be used for reheat only at a maximum 800W for no longer than 40 second intervals. DO NOT EXCEED THESE GUIDELINES.
Remove lid but attach silicone sleeve prior to microwave use. Caution: Cup will be hot upon removal from microwave.
Original Ecoffee Cup® sold in kraft boxes and some limited edition collections, are not suitable for microwave usage.
If you are uncertain, please check bottom of the cup for usage instructions.