Which door type has a lightweight core and is mainly used for interior door applications?

The lightweight core that characterizes this door type is a defining feature that makes it particularly suitable for interior applications. Hollow core doors are constructed with a frame made of thin wood or fiberboard, surrounding a honeycomb or cardboard core, which significantly reduces the overall weight while still providing adequate stability and sound insulation for interior use. This construction method allows for easier installation and operation, making them popular in residential and commercial settings where doors do not need to withstand heavy external conditions.

A solid core door, in contrast, has a denser core that provides enhanced soundproofing and durability, making it more suitable for areas where stronger, more resilient doors are necessary. Panel doors and flush doors serve specific aesthetic purposes and construction methods but do not typically utilize a lightweight core structure like hollow core doors do. Thus, the lightweight, efficient design of hollow core doors makes them the ideal choice for interior installations.