Fluid Least Likely to Leak Through O-Ring?

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SUMMARY

The discussion centers on selecting a fluid that minimizes leakage through an O-Ring interface with a steel rod, specifically for a prototype application. The fluid must remain liquid at 25 degrees Fahrenheit and exhibit low compressibility. Key recommendations include using hydraulic fluid, engine oil, canola oil, glycerin, or antifreeze, while ensuring chemical compatibility with the O-Ring material and considering the surface finish of the steel rod for optimal sealing performance.

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  • Understanding of O-Ring materials and chemical compatibility
  • Knowledge of fluid viscosity and its impact on sealing
  • Familiarity with gland design principles for sealing applications
  • Basic concepts of fluid dynamics in mechanical systems
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  • Investigate the effects of viscosity on fluid leakage in sealing systems
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Engineers, prototype developers, and anyone involved in sealing technology or fluid dynamics who seeks to optimize fluid containment in mechanical systems.

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I am building a prototype, and I was just wondering what fluid I should use that is the least likely to seap through the interface of a steel rod and a small O-Ring, as the steel rod moves forward through the O-Ring. This fluid should not freeze at 25 degrees fahrenheit, and should be relatively incompressible.

Thanks!
 
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You need to select something that is chemically compatible with the elastomer the o-ring is made of. That combined with proper gland design will be the only way to ensure a leak free installation.
 
This actually doesn't need to last long, just a day or two so I can use this once. High performance also isn't particularly important, just that nothing leaks out the seal. I guess I am wondering what the highest viscosity fluid would be that wouldn't freeze in a freezer. (Is it viscosity that would determine this?)
 
Hydraulic fluid, engine oil, canola oil, glycerin, antifreeze, etc...pretty much anything that's doesn't have water as a major component.
 
What's the surface finish of the steel rod?
 

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