The DrySyn Classic, manufactured by Asynt, is a stirring heating block which is designed to fit 51-mm reactors. The unit may be in standard version or fully customized built that meet specific requirements. It is engineered for use with a simple magnetic stirrer or stirrer hotplate. In addition, it is also suitable for various stirred or non stirred applications including hydrogenations, carbonylations and other applications that need air-sensitive materials.