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Solid wood doors are crafted from natural or laminated solid wood materials sourced directly from forests. After processing, these doors offer excellent stability, resistance to warping, rot, and cracking, as well as good thermal insulation properties. The core of a plywood door typically consists of a lightweight frame, and it is commonly covered with veneers such as plywood, fiberboard, or molded panels, making it ideal for interior use.
The core of a solid wood door is usually made from softwoods like pine or fir, while the outer layer is often composed of particleboard or willow board. The surface is then finished with a solid wood veneer that is pressed at high temperatures and sealed with solid wood edging. High-end solid wood doors often feature premium fir in the core and 45–60 silk natural veneer layers (more than three layers) on the surface. Because Chinese fir has low density and is easier to control moisture content, the final product is stable, less prone to cracking or warping. In addition, solid wood doors provide good heat retention, impact resistance, fire resistance, and sound insulation—similar to that of pure solid wood doors.
**Materials Used for Solid Wood Doors**
Common wood types used for solid wood doors include eucalyptus, ash, red pine, and mahogany. Korean pine and eucalyptus are suitable for general decoration, while ash, eucalyptus, and others are better for mid-range projects. Red eucalyptus and mahogany are preferred for high-end residential applications. Most woods have warm, orange-toned hues, and their lignin content helps absorb ultraviolet light. The uneven surface of wood can scatter light, reducing eye strain and damage. Wood is moderately soft, comfortable to touch, and offers excellent acoustic, temperature, and humidity control properties, making it easy to work with. These advantages make wood the most human-friendly material for doors, and despite the rise of new materials, people still favor solid wood doors.
**Plywood Door Materials**
Plywood doors are typically constructed using wood, perforated boards, or high-density boards. The flat parts of the door are covered with decorative panels, while the grooved areas are finished with veneer or paper skins. This type of door is lightweight and affordable but may suffer from color inconsistencies due to manufacturing limitations. Only veneer, paper skin, or nailed wood edges can be applied around the door frame.
Plywood doors are smooth and easy to clean, meeting hygiene standards. However, the quality of the glue used in the plywood significantly affects its durability. Moisture exposure can cause delamination, and prolonged sun exposure may lead to cracking. Therefore, they are not recommended for exterior use. If a mixed water effect is desired, three-ply wood can be directly applied, though the quality of modern three-ply is not very high. As a result, many now opt for red or walnut veneers, which are more cost-effective and visually superior. Veneer surfaces are flatter and easier to paint compared to splints.
The frame of a plywood door is usually bordered with solid wood edging, enhancing its appearance and preventing deformation. Many decoration companies choose this door type for budget-friendly projects. Despite the name "Plywood Door" not sounding very appealing, some customers may perceive it as lower quality, leading to the nickname “Technology Gate.†It is simple to manufacture and uses fewer materials, making it the most affordable option among different door types. Due to its popularity, it is widely sold in the market, and almost every door seller has this type available.