Advancing Adhesives<br>Purity Determination Without a Known Chemical Standard
Using the proven technique of differential scanning calorimetry (DSC), a new service offered by Impact Analytical, Midland, Mich., allows determination of absolute purity based on the well-recognized premise that even small amounts of impurities lower the melting point of a material and broaden its overall melting range. With standards of known purity not readily available for many pharmaceutical and organic materials, the new service helps simplify documentation and reduce time to market.
“This technique is based on ASTM Standard E928-01, which details the use of DSC for assessing purity,” explained Impact Analytical’s Lynn Walker, who was a contributor to the ASTM guidelines. “The method is effective on very small sample sizes, and turnaround is quick,” he said.