supply of electroformed pure nickle screen at 99.90% purity duly hard chrome plated. the thickness at hard chrome plating one nickle screen should be 12 to 14 microns and chrome hardnessshould be 900 to 1000 h.v open area will be 8 to 10% depends on slot size uniformiting at slot opening and unifrom weight on each segment ( wt deference not more 2 to 3 grams ) ( 1- ) d.c -10 / 34o size 0.06mm x2.30mm x 0.28mm open area 6.5% in 4 segment , ( 2- ) w.k-1500 / 30o size 0.06mm x 2.30mm x 0.28mm open aria 6.5% in 6+6 segment normal wt = 5.5 to 5.75 kg. , ( 3- ) d.c 10 / 34c size 0.09mm x 1.68mm x 0.23mm open aria 9% 04 segments. , ( 4- ) nhe.c make c nk-1300 / 30c size 0.05 mm x 2.30 mm x 0.25 mm open aria 4.5% 6+4 segment wt = 4.0kg