Why do Dunkin' cups say do not microwave?
                                
                                
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                                    4 min read                                
                            
                                Since transitioning from foam to double-walled paper cups in 2020, Dunkin' has prominently featured a "do not microwave" warning. This advisory exists for serious reasons concerning material safety, structural integrity, and the potential for a fire hazard, all of which are crucial to understand before attempting to reheat your beverage.