You might be surprised to hear the term "wooden fire door." How can wood resist fire? In fact, the frame is made of fire-resistant wood or fire-resistant wood products. Inside the door, a non-toxic fire-resistant insulation material is filled, followed by a flame-retardant treatment, creating the wooden fire door.
Wooden fire-resistant doors are highly appreciated for their aesthetic appeal and beauty during use, offering the same fire-resistant properties as steel doors, which has made them a favorite among a wide range of consumers.
Common flame-retardant treatments for wood include: spraying, soaking, steaming, vacuum, and vacuum-pressure methods. Spraying and soaking are typically used for wood surfaces that will not undergo further planing or for thin boards with a thickness below 10mm for flame-retardant treatment. They are not suitable for the production of wooden fire doors. While vacuum and vacuum-pressure methods offer superior flame-retardant effects, their high cost has limited their use in some fire door manufacturing facilities.
Factors Affecting Flame Retardancy of Wood: Moisture content in wood to be flame-retardant should be dry, not wet. The moisture content of the wood is a significant factor affecting its flame retardancy quality. The more flame-retardant liquid absorbed by the wood, the better its flame retardancy performance, higher its oxygen index, and deeper its flame retardancy depth.
According to tests, under the same flame-retardant conditions, wood with a moisture content below 15% exhibits a flame-retardant depth increase of over 3mm compared to wood with a moisture content above 40%.
The flame-retardant quality of the wood used in fire-resistant doors directly impacts their fire resistance. However, due to the lack of seasoned process flow in the flame-retardant process, the flame-retardant technology varies among different manufacturers. Poorly designed flame-retardant processes fail to ensure quality, and in severe cases, can reduce the fire resistance of the doors, posing potential hazards to people's lives and property.
