NLGI is a not-for-profit trade association, primarily composed of companies who manufacture and market all types of lubricating grease. Membership is by company rather than by individual. Associated with the manufacturers are companies who serve them with equipment, supplies, and services. Additionally, there are research and educational groups and member companies whose interests are primarily technical. Another category for membership – Consumer – is for organizations that are users of lubricating grease. The Institute thus works continuously to strengthen its association by rendering service to the end-user of grease as well as those on the manufacturing side.