White paperboard is used for printing business CARDS, cover, certificate, invitation ... 787mm*1092mm size ,magnanimous paper size for 850*1168mm,2,white carboard relatively thick strong ,quantitative bigger ,its quantitative 200g/m2 ... tight degrees usually not less than 0.8/m3, the white degree the higher ,A,BandC third-class whitenness,no less than 87 ...