Dear sirs, I wish to inform that we specialize in the manufacture of manganese products in wide range. Our firm is the leading supplier of the electrolytic manganese, manganese metal, electrolytic manganese dioxide and some other related products in China. Our products are in high quality and low price. Welcome all the friends both abroad and at home to send your inquiry, we will quote you price immediately.  Vanadium pentoxide Spec: V2O5 98%MIN V2O5 98%MIN  V2O4 2.5%MAX  SI 0.25%MAX  FE 0.30%MAX  S 0.10%MAX  P 0.05%MAX  AS 0.02%MAX  Na2O+K2O 1.00%MAX Spec: V2O5 99% V2O5 99%MIN  V2O4 1.5%MAX SI 0.15%MAX  FE 0.15%MAX  S 0.01%MAX  P 0.006%MAX  AS 0.005%MAX  Na2O+K2O 0.05%MAX Spec: V2O5 99.5% V2O5 99.5%MIN  V2O4 1.0%MAX  SI 0.10%MAX  FE 0.08%MAX  S 0.01%MAX  P 0.004%MAX  AS 0.005%MAX  Na2O+K2O 0.03%MAX