News
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EPDM Volume Change in Ethylene-Glycol Coolants: Swelling, Additive Compatibility and Seal Stability
Executive Summary: Volume Change Is a System Response An EPDM seal in ethylene-glycol coolant is exposed to a multicomponent fluid, not glycol alone. Water, glycol, inhibitors, buffers, anti-foam agents, stabilizers, contaminants and oxidation products affect uptake, extraction, lubrication and s...Read more -
Hydrolysis Risk of PU Seals in Water-Based Media: Swelling, Hardness Drift and Long-Term Leakage
Executive Summary: The Failure Chain Is Longer Than Water Exposure A PU seal in a water-based medium does not fail through one isolated event. Water absorption begins at the exposed surface, water diffusion develops a concentration gradient through the section, and the medium chemistry determines...Read more -
FFKM Surface Erosion in Plasma Environments: Particle Generation, Seal Integrity and Cleanliness Control
Executive Summary: Surface Damage Precedes Many Vacuum Failures FFKM surface erosion in a plasma chamber is not simply a question of whether the polymer survives a nominal temperature. The exposed surface receives a chemically specific combination of radicals, ions, ultraviolet radiation, heat an...Read more -
Rapid Gas Decompression Failure in Rubber Seals: Crack Initiation, Pressure Release and Material Selection
Executive Summary: Why Immediate Leak-Free Results Are Not Enough Rapid gas decompression (RGD) failure occurs when an elastomeric seal exposed to high-pressure gas is depressurized faster than gas can leave its internal structure. External pressure falls first while sorbed gas remains and expand...Read more -
PTFE Creep and Bolt Preload Loss: Long-Term Compression Stability in Bolted Sealing Joints
Executive Summary: Why Initial Sealing Does Not Guarantee Long-Term Sealing A PTFE bolted joint can pass an initial pressure-hold test and later leak without visible nut rotation. The test proves containment only at its defined pressure, temperature, assembly condition and duration; it does not p...Read more -
Double Mechanical Seals for Chemical Pumps: Barrier Fluid, Heat Accumulation and Hazardous-Media Isolation
Executive Summary Double mechanical seals for chemical pumps form a controlled leakage and hazardous-media isolation system, not a zero-leakage guarantee. The inboard seal faces the process fluid; the outboard seal faces the atmosphere or a support-fluid cavity. A barrier or buffer fluid, reservo...Read more -
LNG Cryogenic Valve Sealing: Thermal Contraction, Stem Movement and Low-Temperature Leakage
Executive Summary LNG cryogenic valve sealing is a coupled thermal, mechanical and fluid-boundary problem. Valve body, bonnet, stem extension, seats, stem packing, glands, body-bonnet gaskets and end connections each protect a different leakage path. Reliability depends on thermal-contraction com...Read more -
Electrolyzer End-Plate Sealing: Alkaline Solution, Pure Water and Stack Compression Stability
Executive Summary Alkaline electrolyzer end-plate sealing is a system-level boundary problem. End-plate geometry, gasket compression, stack alignment, compression uniformity, chemical compatibility and cycling history determine whether alkaline solution, pure water and gas-side spaces remain sepa...Read more -
High-Pressure Hydrogen Storage Valve Sealing: Hydrogen Permeation, Depressurization Cycling and Elastomer Failure
Executive Summary High-pressure hydrogen valve sealing is a coupled materials, geometry and pressure-history problem. Valve architecture, elastomer formulation, seal geometry, extrusion-gap control, compression, pressure cycling, temperature, surface condition, assembly quality and leak verificat...Read more -
Fuel Cell Stack Sealing: Bipolar Plates, Coolant Loops and Hydrogen Cross-Leakage
Executive Summary Fuel-cell stack sealing is a multi-interface fluid-isolation problem. Bipolar-plate geometry, gasket compression, stack alignment, load uniformity, hydrogen containment, coolant isolation, thermal and pressure cycling, chemical compatibility and leakage verification jointly dete...Read more -
EV Thermal-Management Valve Sealing: Refrigerants, Glycol Coolants and Multi-Media Switching
Executive Summary EV thermal-management valves separate or switch refrigerant, glycol-water coolant, air-side conditions and residual process fluids. Their sealing reliability is a boundary-condition problem rather than a material-name problem. Refrigerant compatibility, glycol compatibility, sea...Read more -
E-Axle Reducer Oil Seals: High-Speed Rotation, Oil Foaming and Shaft Runout Control
Executive Summary An e-axle reducer oil seal operates at a different boundary condition from a low-speed gearbox seal. The shaft may rotate rapidly, the gears may agitate lubricant, and the seal interface must manage sliding speed, frictional heat, oil-film stability and shaft motion at the same ...Read more