How to accurately determine the quality of compressed wood pulp cotton?

With the rise of the industry, competition among peers has intensified, leading to a chaotic market for packaging sponge products. Most non-professionals find it difficult to distinguish the quality of sponge products. So, how can we accurately identify the quality of wood pulp sponge when purchasing sponge products?
Compressed Wood Pulp Sponge Products
I. Visual Inspection: Good packaging sponge, after molding, has relatively symmetrical proportions, giving a visually appealing structural aesthetic. Aside from special types of sponges with large or irregular pores, generally speaking, the smaller the pores on the surface of the sponge, the better.

II. Softness: High-quality sponges rebound quickly when pressed. Fluffy sponges are better because they have strong elasticity, effectively absorbing shock and abrasion. If it feels abnormally stiff, it's a low-quality sponge product, unsuitable for protecting items.
III. Tensile Strength: High-quality sponges generally have an 80% tensile strength. If this isn't achieved, the sponge is of average quality and doesn't breathe well for daily use, making it unsuitable for long-distance transport and storage.
IV. Odor Identification: Generally, high-quality sponges don't have a distinctive unpleasant odor. An unpleasant odor indicates it's made from inferior materials.
V. Tear Resistance Comparison: High-quality sponges are elastic, clean, and odorless. When squeezed and released, the more pronounced the rebound, the better. Cheap sponges are dull in color, have a pungent odor, and tear easily. If the sponge doesn't easily tear when pulled, it indicates acceptable quality.