School desks come in various designs and materials, so their hardness can vary. Typically, school desks are made of wood, metal, or plastic. Wooden school desks can range from medium-hard to hard, depending on the type of wood used. For instance, desks made of oak or maple are harder and more durable compared to those made of pine. Metal school desks, usually constructed from steel or aluminum, are generally considered hard and have good resistance to wear and tear. Plastic school desks are often made from high-density polyethylene (HDPE) or polypropylene (PP), which are reasonably hard plastics known for their durability.
However, it's worth noting that the specific hardness of a school desk can vary based on factors such as its age, usage, and maintenance. Older desks may show signs of wear and tear, making them less hard and more susceptible to damage. Regular maintenance and proper usage can help preserve the hardness and longevity of school desks.