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38 PRODUCTION MACHINING :: NOVEMBER 2017 PARTS CLEANING Following Cleaning Protocols ree industry standard requirements are examined here as well as how well these requirements play together with customer-specific standards. Contributed by Ben Lang I SO 16232 and VDA 19.1, familiar industry standards for technical cleanliness, are generic by design and lay out the framework for developing cleanliness speci- fications for particulate contamination of components and systems. But how many manufacturers unwittingly violate their requirements? Since the first editions of VDA 19 and ISO 16232 were published in 2004 and 2007 respectively, most customer- specific standards adhere to or are modeled after them. Developed primarily by the OEMs and Tier-One suppliers, customer-specific specifications are written to control the cleanliness of a system (for example, transmission) and are cascaded down to lower tier suppliers. Limits may be defined for mass, particle size or particle size distribution, and in many cases, the inspection procedure is prescribed. is approach makes sense on the surface—define the requirements and communicate them. However, many customer-specific standards go too far by prescribing inspection procedures that are component specific or :: Choosing a compatible test liquid is essential to acquiring accurate data from cleanliness inspections.