Does 50D wood pulp cotton refer to density?

50D wood pulp cotton refers to high-density sponge with a density of 50, meaning it has a hardness of 50. This refers to the amount of lignin and wood fibers contained per unit volume; it's a physical quantity representing the relationship between the volume and mass of lignin and wood fibers. In other words, wood pulp cotton with a density of 50D is considered high-density.

50D wood pulp cotton has high density, strong toughness, and fast resilience. Wood pulp cotton is a natural fiber, not a synthetic fiber, and is not a man-made chemical. However, the applications of wood pulp cotton with this density are relatively narrow, and the manufacturing process is more complex.