As manufacturing tolerances increase, contamination control becomes an important means of reducing wear and prolonging the operational lifespan of complex assemblies. The presence of contamination on machined parts results in a variety of potential problems for machine users:
Friction between moving parts
Poor heat transfer efficiency in heat exchangers
Impeded fluid flow in piping and tubing
Manufacturers have long relied on membrane filters and devices from Merck to evaluate the cleanliness of newly made parts by running the Millipore test (gravimetric analysis) to quantify the total mass and size of contaminating particles.