Inspecting workpiece cleanliness is a vital part of the parts manufacturing process. It’s essential for maintaining high product quality and durability, especially in industries striving to reduce greenhouse gas emissions and improve vehicle powertrain assemblies. Complete assemblies, like engines or transmissions, require precise manufacturing and lubrication, making cleaning inspection crucial for controlling component cleanliness and overall assembly contamination.

Why is millipore testing necessary, and when should it be done?

Millipore inspection is crucial for systems involving fluids and moving parts, such as engines, transmissions, fuel systems, and EV battery and motor assemblies. Residual contaminants can lead to premature failures, safety recalls, and higher warranty costs. This testing validates new cleaning equipment and maintains the process’s repeatability to meet specifications.


To analyse the cleanliness of components and systems in road vehicles, specific equipment is necessary. This includes Vapor Corrosion Inhibitor (VCI) bags for part isolation, latex gloves, Millipore testing equipment with a pressure sprayer, and an analytical balance. Tests are conducted in a controlled environment with regulated humidity and temperature, maintained by positive pressure to prevent airborne contamination. The ISO_16232 standard outlines a common testing procedure involving pressure-rinsing parts with a prepared aqueous solution, collecting it through a filter membrane, and drying the membrane. Weight analysis is performed by comparing filter weights before and after extraction. Microscopic analysis, like systems, helps identify particle size and material composition.


A washer’s cleaning performance is subject to several key factors. The choice of filtration type, such as bag or cartridge filters, impacts cleaning efficacy, with cartridge filters needed for rigorous standards. Filter material compatibility with cleaning chemistry is essential. Filter media condition and materials of construction, such as stainless steel versus carbon steel, play crucial roles. Additionally, the type of contaminants on parts and the cleaning chemistry used should align. External environmental factors and testing conditions in a controlled setting also influence cleaning results.


Maintaining washer equipment is vital for result consistency. It begins with a clean, properly titrated cleaning solution, as neglecting it can lead to subpar cleaning and rejected parts. Regularly replacing filtration elements, checking process parameters like conveyor speed, pressure, nozzle orientation, and temperature, is essential. With the growing demand for cleanliness inspection, manufacturing companies must adapt, considering not just equipment but other crucial factors like proper scrubs selection, preventive maintenance, and a clean environment to meet required specifications.

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