News
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CMP Slurry Abrasive Erosion of Equipment Seals
Executive Summary CMP slurry can contribute to equipment-seal wear when suspended solids reach a loaded or moving sealing interface and remain in contact with the seal, counterface, groove or adjacent hardware. Repeated contact may be consistent with scratching, cutting, ploughing, material remov...Read more -
Slit-Valve Edge-Seal Scraping and Wafer Contamination
Executive Summary A slit-valve edge seal is a moving contact interface close to the wafer-transfer path, where compression, sliding, wiping, seal shear, local rolling and edge loading can occur during each valve cycle. Ideally, the perimeter seal is compressed against the door-frame contact surfa...Read more -
Particle Entrapment in Load-Lock Door Seals and Pump-Down Curve Drift
Executive Summary A load-lock door seal is a vacuum boundary and a particle-sensitive contact system. Door opening, closing and wafer transfer can move particles into the seal contact line, seal groove, door-frame edge or wiping path. Particles may come from wafers, carriers, chamber parts, mecha...Read more -
Non-Uniform Filler Dispersion in Rubber Seals and Local Performance Variability
Executive Summary: Why Average Compound Data Cannot Prove Local Seal Uniformity A rubber seal is often accepted by average hardness, tensile strength, elongation and compression set. Those values are necessary for batch screening, but they do not prove that every location in the molded seal has t...Read more -
Stress Relaxation Differences in Rubber Seals Under Multiaxial Compression
Executive Summary: Why Uniaxial Relaxation Data Is Not Enough Rubber seal stress relaxation is often discussed as if it were a single material number measured in a simple compression fixture. That view is incomplete for real sealing systems. An assembled seal is rarely compressed in only one dire...Read more -
Seal Re-Wetting Recovery After Draining a Liquid-Cooling System
Executive Summary: Why Refill Does Not Prove Seal Re-Wetting After a liquid-cooling system is drained, the seal interface does not necessarily preserve the same liquid film that existed during normal operation. Coolant may leave grooves, quick connectors, valve seats and compressed contact zones ...Read more -
Local Seal Temperature Rise After Microchannel Blockage in Cold Plates
Blockage-Induced Seal Heating as a Local Reliability Problem Microchannel blockage in a cold plate is not a uniform thermal event. It changes local flow, local pressure distribution and convective heat transfer, so the seal groove, cover edge, end cap or interface boundary can heat while the aver...Read more -
How Dielectric Coolants Affect the Volume and Mass Changes of Seals in Immersion-Cooling Systems
Gravimetric Change as an Incomplete Reliability Indicator In immersion-cooling systems, a seal is not briefly splashed by coolant; it may live continuously in a dielectric fluid, leave the fluid during service, dry partially, and then return to immersion. Under that duty, mass change is only one ...Read more -
How Liquid-Cooling Quick-Disconnect Locking Mechanisms Affect Seal Compression
Executive Summary A liquid-cooling quick-disconnect uses its locking mechanism for more than separation prevention. The latch, sleeve, balls, collet, clip or threaded ring controls the final axial position of the coupling halves. That position determines whether O-rings, face seals, poppet seals ...Read more -
Pull-Off Load of Server Liquid-Cooling Hose-End Seals
Executive Summary A server liquid-cooling hose end is a fluid boundary and mechanical connection. Pull-off load may come from maintenance handling, hose weight, bend recovery, vibration, thermal expansion, hose misalignment and pressure thrust. The O-ring or face seal may hold coolant locally, bu...Read more -
Gas-Liquid Alternating Response of Automatic Deaeration-Valve Seals in Liquid-Cooling Circuits
Executive Summary An automatic deaeration-valve seal does not face one static coolant pressure. It moves through gas exposure, liquid wetting, pressure variation and mechanical reclosure while the valve body, float, poppet, diaphragm or spring-loaded element changes the local sealing load. Air re...Read more -
Differential-Pressure Cycling in Liquid-Cooling CDU Filter-Housing Seals
Executive Summary A CDU filter-housing seal is not exposed to one static pressure value. It works at an interface where filter resistance, flow demand, pump transients, temperature and maintenance repeatedly change the local load. Filter loading can increase differential pressure, but high differ...Read more