1.MDF made of pine and hard wood inner structure intensity more than 0.80 Mpa swell rate less than 9% moisture: 4 to 11.7 density:720kg/m3 to 750kg/m3 formaldehyde emission: E2,E1   exterior structure intensity more than 1.5 Mpa Normal size:1220*2440*2.5~25mm 2.HMR(high moisture resistent)-MDF with melamine face/back core color:green normal Size:1220x2440x15/18mm Material: Pine & hardwood Face: 2 sides well sanded; melamine face/back available; Glue: melamine density:735kg/m3 Advantage:strong moisture resistance. Inner structure intensity More than 0.80 Mpa Swell rate: less than 6% Moisture: less than 6% Any interest please contact us.Thanks!