Which manufactured board is described as very strong and rigid?

Blockboard is often referred to as very strong and rigid due to its unique construction. It consists of a core made from strips of softwood that are glued together, which provides structural integrity and strength. This core is then sandwiched between layers of plywood or veneer. The combination of these materials results in a manufactured board that is not only strong but also lightweight, making it suitable for various applications, such as furniture and cabinetry.

In contrast, the other options like chipboard, particle board, and OSB have different properties. Chipboard and particle board are made from smaller wood particles and have a lower strength compared to blockboard, making them less suitable for heavy-duty applications. OSB, or oriented strand board, is designed for specific uses, particularly in construction, but it does not offer the same level of rigidity as blockboard due to its composition and intended purpose.