It is a type of lightweight, relatively inexpensive plywood often used for underlayment, cabinet backing, and craft projects. Its construction typically involves a core of soft, fast-growing wood veneers, often sourced from Southeast Asia. For instance, it might be applied beneath a flooring surface to provide a smooth and even base.
The materials advantages lie in its affordability and workability. It can be easily cut, shaped, and fastened. Historically, it gained popularity due to its smooth surface, which readily accepts paints and finishes. However, it’s less durable and moisture-resistant than other plywood varieties, limiting its suitability for heavy-duty or exterior applications.