Appearance: White powder PH(1 wt% solution): 6.0-7.0 Water solubility: About 1000g / l (20 â??), about 1200g / l (80 â??) Cas no.: 14025 - 21 - 9 Zinc content: 15 % (+/- 0.5) as Zn Characteristics: easily and rapidly soluble in water because of its porous, compatible with most water-soluble fertilizers