Packing: 25kg/40kg/50kg , plastic bag inside and carbaord drum outside Chemical properties: the color is yellow-orange. The relative density is 3.357g/cm3 . It is not soluble in anhydrous ethyl alcohol but can dissolve in acids or alkali. The steam is poisonous and the relative molecular weight is 181.88 . Quality guarantee : Advanced technique, completed resource controling system and hard and fast measurement of products , which all make sure of the products stability . Today our products have been sold all over the world like america , german , middle east and so on . We have about twenty years experiences of production and have enjoyed good reputation in this line .Welcome to contact us ! 98% 99.5% 99% 99.9%