CNC Machining for HighVacuum and UltraClean Applications

In the demanding fields of semiconductor manufacturing, aerospace, particle physics, and life sciences, component failure is not an option. The operational environments are extreme: highvacuum chambers where even a single outgassed molecule can disrupt a process, and ultraclean systems where a microscopic contaminant can ruin an entire batch of pharmaceuticals or silicon wafers. For these critical applications, standard CNC machining is insufficient. It requires a specialized, holistic approach to manufacturing that encompasses material science, precision engineering, and stringent postprocessing.


cnc machining center
The journey begins with material selection. Not all metals and plastics behave the same under vacuum. Preferred materials like certain grades of stainless steel (e.g., 304, 316L), aluminum alloys, and titanium exhibit low outgassing rates and high stability. Plastics like PEEK and Vespel are chosen for their minimal vapor pressure. The CNC machining process itself must be optimized to create surfaces that are inherently cleanable. This involves specific tool path strategies to achieve very low surface roughness (Ra), eliminating microscopic pits and crevices that can trap contaminants or become outgassing sources. Sharp internal corners are avoided, and designs favor radii that facilitate easier cleaning and pumping.

However, the true differentiator for highvacuum and ultraclean components lies in the postprocessing. After precision machining, parts undergo a rigorous multistage cleaning protocol. This typically involves ultrasonic cleaning with specialized solvents to remove oils and particulates, followed by precision cleaning and passivation for stainless steel to enhance the corrosionresistant oxide layer. For the most critical applications, components undergo a final bakeout in a vacuum oven. This process heats the parts to a specific temperature under vacuum, forcibly driving off any remaining moisture and volatile substances adsorbed on the surface, ensuring they will not contaminate the operational environment.

As a onestopshop for precision components, we understand that your success depends on parts that perform reliably in these punishing conditions. Our expertise is not just in cutting metal to exact tolerances, but in mastering the entire value chain—from advising on vacuumcompatible materials and designs to executing the critical finishing and validation processes. We provide the certainty that your components will meet the stringent standards for leak integrity, minimal outgassing, and particulate cleanliness. Partner with us to ensure the integrity and performance of your most critical systems, from research and development to fullscale production.