Honeycomb Paper, a crystallization of bionic wisdom, mimics the structure of hexagonal beehives. Due to its light weight and low cost, it is widely used in the door industry and is not as inferior as the misunderstood "paper shell door."
Aerospace Aluminum Foil is honeycomb-shaped, and it can be basically identified if a relatively loud sound is made when pressed. This type of filler is corrosion-resistant, anti-aging, non-cracking, and non-bubbling. It performs well in flame retardancy, heat insulation, soundproofing, and shock resistance, and is non-toxic, harmless, and highly environmentally friendly.
Polyurethane Foam requires a foaming machine to fill the gaps inside the door, which then expands and solidifies. Doors filled with this material are thicker, stronger, and have excellent sealing performance. They are highly effective in heat retention and soundproofing, and are also high-temperature resistant with a long service life.
Rock Wool is mostly used in fire doors. It is made of high-temperature molten rock fibers, which are solidified into shape with the addition of binders. It boasts excellent soundproofing, heat insulation, and fire resistance properties, along with high strength, effectively ensuring door safety.