The First line of defense for a house is its door, and the door's quality has a significant impact on how safe the house is. Doors come in a variety of shapes and styles, and each one serves a distinct function. Purchase security doors if you place a higher priority on safety. The anti-theft door often contains inside filling , and various inside filling has various anti-theft effects. Let me show the inside filling in the security door to you. 1. Honeycomb P aper Honeycomb paper is a kind of material shape that human beings learned from the sealed hexagonal honeycomb structuer according to the inspiration of bionics . It has very good mechanical properties and is a common inside filling in the door industry all over the world. It is not the rumored " P aper S hell Door". The main advantages of honeycomb paper are good sound insulation, low cost, and light weight, so it is very suitable as a inside filling for steel security doors. 2. Rock W ool One of the often used inside filling for steel security doors is rock wool. Rock wool has a good fireproof function because it is melted at high temperatures into fibers, mixed with the right amount of binder, and solidified. It is frequently utilized in fire and theft-prevention doors. It is appropriate for heat insulation and sound insulation in construction materials, commercial equipment, decorative items, etc. 3. Polyurethane F oam Polyurethane foam is a new type of synthetic material with thermal insulation and waterproof functions. A nd it has particularly strong effects for both thermal and sound insulation. The all-water foamed polyurethane material used to manufacture the anti-theft door has the ability to withstand temperatures beyond 200°C, giving it a long service life and excellent anti-theft performance. 4. Aluminum H oneycomb ( A viation A luminum F oil) Aluminum honeycomb is the ideal inside filling for security door s. Compared with the previous fillers, it has more advantages. It is a high-quality inside filling for fire doors , insulation doors, and advanced security doors, but the price will be more expensive. Useluck Door as a domestic excellent security door supplier , our standard style se curity door accessories are used domestic first-class brand supplier products, we can also according to the customer selected accessories brand to purchase, by our purchase can not only guarantee the genuine product can also be lower price. We can also customize bathroom door s , security door s, fire-proof doors , American-style doors , etc.