We supply premium Sulfur in Residual Oil Conostan standards for petroleum analysis. Our catalog features stocked concentrations from 2,500 to 50,000 µg/g. Please review the table below for specific stock options. We also provide custom standards for other specific concentrations. These tailored solutions can reach levels as low as 1 µg/g. Conostan includes a comprehensive certificate of analysis with each standard. This official document clearly reports precise product concentrations and density values.