Chesterton (also known as A.W. Chesterton Company) is a provider of industrial fluid sealing systems, protective coatings, industrial lubricants, and maintenance, repair, and operation (MRO) chemicals. Its products include mechanical seals, pump packing, valve stem packing, hydraulic and pneumatic seals, industrial lubricants, cleaners, degreasers, etc. The company serves the manufacturing, energy and resources, and process industries.