We buy corn of 3 class: humidity – max.14.0%; dirtiness- max. – 2,0%; grain admixture, max. – 10,0%; beaten, max – 5,0%; damaged max – 5,0%; include damaged by drying, max – 2,0%; color, smell of healthy grain,infectiousness – no more than 1 grade; other indicators according DSTU 4525:2006