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Firstly Common Classification
1. By Application
Packaging Grey Board: Gift boxes, jewelry boxes, wine boxes, cosmetic box liners, support structures
Hardcover Grey Board: Book hardcovers, picture albums, notebook covers
Industrial Grey Board: File folders, puzzle backboards, photo frame backboards, luggage liners
1.2 By Technology and Structure
Single-sided Grey Board: One side grey, one side white/light-colored, suitable for laminating and film coating
Double-sided Grey Board: Both sides grey, high flatness, stable hardness
Full Grey Board: Grey core layer + surface layer, high stiffness, moderate cost
Coated Grey Board: Smoother surface, suitable for direct printing and hot stamping
1.3 By Thickness / Weight
Thin Type: Below 1mm, used for light packaging and liners
Regular Type: 1–3mm, most commonly used for gift boxes and book covers
Thick Type: Above 3mm, used for heavy-duty gift boxes and industrial supports
Secondly Core Characteristics
2.1Good stiffness, not easy to deform
Sufficient hardness and strong support, no collapse when used for boxes.
2.2High flatness
Smooth surface, suitable for laminating, hot stamping, UV coating and other processes.
2.3Easy to process Smooth cutting, die-cutting, creasing and slotting, without edge cracking or delamination.
2.4Strong stability
Folding-resistant, extrusion-resistant, not easy to deform due to moisture, suitable for long-term use.
2.5Eco-friendly and recyclable
Mainly made of recycled pulp, meeting environmental requirements for packaging.
2.6Cost-effective
Wide range of optional hardness and thickness, controllable cost, suitable for mass production.