In view of the growing importance of “technical cleanliness” Arnold, working closely with the Fraunhofer Institute, has set up a cleanliness compliance procedure for fasteners – “Cleancon®”. What have always been rather general cleanliness requirements for components can now, for the first time, be precisely categorised. Arnold has set up its own test laboratory which develops and adapts test specifications to stipulate the degree of component cleanliness required in production and throughout the entire supply chain.