Sigma Aldrich has a strong product portfolio of gas chromatography products. The company is engaged in the research, manufacture, and supply of chromatography columns and related tools. Supelco Analytical is a part of the Sigma-Aldrich Corporation, which has subsidiaries in 35 countries, and a network of more than 50 international distributors. The company provides technical support to help customers troubleshoot problems, verify conditions for product use, and recommend products for specific applications.