In general, the core value of grey cardboard lies in its excellent cost-effectiveness and functional balance. It successfully combines key physical properties (strength, rigidity, durability) with excellent processing suitability (easy to cut, fold, print, and bond), while taking into account environmental protection demands (high recycled fiber content) and significant economy (low cost). This unique combination makes it an ideal choice for large-volume, practicality-oriented applications. Whether it is product packaging that requires sturdy protection (such as the lining of electronic product boxes and cosmetic boxes), display materials that require flatness and crispness (such as backboards, sign bases), printed materials that pursue texture and durability (such as hardcover book covers, folders, menus), or basic materials in education, handicrafts, and model making, grey cardboard can provide reliable and economical solutions, and is an efficient bridge between design creativity and industrial production or daily practicality.