hubei zhengdong chemical co.,ltd.
our hubei zhengdong chemical co.,ltd is a big chemicals material company in china, our main products is :Sodium lignosulphonate HS CODE: 3804000090,Calcium lignosulphonate .Sodium Gluconate HS CODE: 2918160000(SG99%,Sodium Naphthalene Sulfonate Formaldehyde HS CODE: 3824401000(SNF