... surface 4.Past ISO9001-2008,FSC,SGS,SDS test Grey paper board,grey chipboard1.top grade wood pulp/recycle pulp2.good stiffness3 ... :0.4-5.0mmour main productA.Grey chip boardB.Grey board (both side grey)C.black boardD.Grey board laminated with Black card , white ... card , kraft paper and many other kinds of paper .E.Grey board color black , white,black and any other colorF.Coated ...