8mm is the most popular thickness. There are several reasons for this:

A. 8mm plank is much cheaper than that of 12mm.  It is about USD1.00/sqm  difference between them. Though it is a bit more curving than 12mm plank, the locking sytem of it still work well. But the price difference among 6mm, 7mm and 8mm is very little.

B. There are many possible quality problem with 6mm and 7mm laminate flooring:1. The planks are so curving that they can’t be locked well. 2. The planks are too thin to hold the locking system at the edge. 3. The locking system on the planks is too weak to connect together firmly.

C. There is no big noise with 8mm plank when people step on it.

D. 8mm thickness can work with 297mm width. But for 6mm and 7mm,the plank is easy to be curve in the across side.

E. 1*20ft container can hold about 2630sqm of 8mm plank(pallets are included in container). For 12mm plank, the packing  quantity is about 1830sqm. So 1*20ft container can more 8mm plank. And 8mm products reduce the shipping cost a great deal.