Routine laboratory work involves purifying, enriching or separating for subsequent analysis. Solid, liquid and gaseous substances also have to be purified for production-scale processes. Various chemical and physical methods can be used for this purpose: absorption, adsorption, chromatography, distillation, extraction, ion exchange, filtration, complex formation, crystallization, drying and many more. Merck offers a wide range of products with absorptive, adsorptive, filtration and clarification properties. These products can be used for purification but also as reaction and filtration aids, as fillers, additives or as carriers of active ingredients. In addition we offer reagents for the preparation of gases, cooling mixtures or for adjusting relative humidity as well as classical laboratory auxiliaries.