Using Paper honeycomb in the building doors is one of the earliest applications of Honicel honeycomb structure material. In the E&A markets, about 80%-90% of doors used Paper honeycomb to be filling material, which not only reduces the price of production, but also enhances the bending resistance strength, In the Chinese market, there are more and more door manufacturers adopt Honicel paper honeycomb to produce various doors to replace solid wood or EPS foam filling material.