The national standard for absorbent paper primarily concerns its physical and chemical properties to ensure its safety and suitability.

Physical properties: The standard for absorbent paper includes parameters such as thickness, absorption speed, and basis weight to ensure its performance in different applications. For example, the standard for the Cobb absorbency test mentioned that the basis weight of the absorbent paper is 200-250 g/m^2, and the absorption speed is 75 mm/10 minutes, reflecting the performance requirements of the absorbent paper in laboratory testing.

Chemical properties: Absorbent paper needs to meet specific safety standards, such as heavy metal content, fluorescent brightener content, and formaldehyde content, to ensure its safety.

In addition, absorbent paper may have stricter standards in specific fields such as healthcare and kitchen use, such as microbial indicators and non-toxicity.