Grey board has a very wide range of USES, occupies a large part of the space in the packaging market, there are also many grey board paper mill home therefore rise up. Grey board is good, but also to product qualified to play their role. The specifications of the grey board has certain requirements, take into account when making its use, strengthen the performance in a particular field. It should possess the following requirements on the use of performance: 1, to have paper loose and good plasticity, to ensure that the applicable binding pressure, hot stamping features; 2, want to have a cardboard unifor thickness and deformation performance, to ensure the standardization of the cover design; 3, to have good stiffness and good mechanical strength, to maintain the practicability of binding books, picture albums and durability; 4, want to have a certain strength of layered, to meet the needs of the binding processes; 5, the board itself is not allowed to use plant starch adhesive bonding, in case of starch mould to breed. This is where the performance requirements of the grey board, at the time of production must ensure that its performance, to make it a popular!