Welcome to the new Reagecon Physical and Chemical Standards catalogue. Since the publication of our last laboratory reagents catalogue, substantial changes have occurred in the field of analytical chemistry. Stringent regulatory demands combined with major economic implications and increased competitiveness, places necessity for validation on every analytical test performed, either in the laboratory or in the field. Not only must the correct result be obtained, but proof must also be provided of its fitness for purpose, validity and accuracy. Such proof must then be accessible, retrievable and presented in an easily understood format. Reagecon continue to respond to these challenges by presenting to its customers, an ever increasing range of highly specified, stable, traceable and certified standards.