“…In recent years, traditional halogen‐based flame retardants have high‐efficiency flame retardance have been used in UPR market. However, the halogen‐containing materials will release large amounts of corrosive gas and toxic smoke gases when they are burning, which endangers human health and property safety . Hence, the current research studies are more focused on halogen‐free, low‐smoke, low‐toxic, and environmentally friendly flame retardants, such as magnesium hydroxide (MH), expandable graphite (EG), intumescent flame retardants, and phosphorus containing flame retardants.…”