Nano calcium carbonate for print ink (cc-ot series) Cc-ot a nano-structured calcium carbonate exclusively used for high standard printing ink, is tasteless white powder upon surface treatment, the particle diameter is 20-50nm, and shape of the crystal is í«cubicí» is has the following advantages:good dispersing ability , high surface activeness and regular particles. Itmes Index No. Physical properties Cc-ot 1 Apperance White powdery 2 Surface area, m2/g (bet)í² 25 3 Average particle size, (nm) 20-50 4 Specific gravity g/cm3 2.50 5 Brightness % í² 80 6 Moisture % ín 0.90 7 Dop oil absorption ml/100g 30.0-50.0 8 Residue on 120 mesh % ín 0.02 9 Lgnition loss, % 44ía1.0 No. Chemical analysis 1 Ph value 8.5-9.5 2 Caco3 % í² 96.0 3 Mgo % ín 0.80 4 Sio2 % ín 0.30 5 Fe2o3+al2o3 % 0.30 6 Activation % í² 95.0 7 Surface treatment Resin acid