We supply Oxalic Acid many years, and we now export to more than 15 Countries. Please feel free to contact us. Oxalic AcidCertificate of Analysis Index Standard GB1626-2006Result Oxalic Acid , %≥99.6%99.65%Sulphate radical , %≤0.08%0.07% Residue after Ignition , %≤0.080.08Heavy metal,%≤0.0010.001Fe,%≤0.00150.0012Chloride , %≤0.0030.003 Oxalic Acid