Alfa Aesar’s large range of high purity inorganic compounds and metal powders make up the Puratronic brand line. Puratronic product purities are generally the highest available, typically 99.995% to 99.9999%, with some reaching 99.99995%. Alfa Aesar employs proprietary and proven processes to ensure the quality and purity of Puratronic products. Each step of the production process is carefully documented and strict quality controls are employed. All Puratronic products ship with a Certificate of Analysis which matches the appearance of product labeling.