The standard defines the relevant terms used to describe tissue paper and toilet paper products, aiming to ensure a uniform understanding within the industry. The document covers the basic terminology of tissue products, including water-absorption, absorptive capacity, accelerated aging, etc., while also detailing concepts such as apparent bulk density, base paper and substrate forming. The new edition of the standard has carried out the integration and editorial update of terminology on the basis of the second edition to adapt to the development of tissue paper technology. By unifying terminology, the standard promotes the harmonization of terminology in production, testing and trade, improving the efficiency of communication.