Understanding Vacuum Process & Weight Changes

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    Explanation Vacuum
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Discussion Overview

The discussion revolves around understanding the vacuum process, particularly in the context of epoxy rubber manufacturing. Participants explore the implications of weight changes in materials subjected to vacuum conditions and seek clarity on the principles behind these processes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks information on the vacuum process and its effects on the weight of a liquid material.
  • Another participant clarifies that "vacuum process" is a broad term encompassing various specific processes and emphasizes the need for specificity.
  • It is suggested that the mass of a liquid under vacuum may differ due to the removal of dissolved gases.
  • A participant describes their specific use of a vacuum oven in epoxy rubber manufacturing and questions whether the container's weight would decrease after the vacuum process.
  • One response notes that drawing a vacuum over epoxy rubber mixtures aims to remove entrapped air, which could result in a small weight change proportional to the air removed.
  • A participant plans to conduct a weight test before and after the vacuum process to observe any changes.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the vacuum process, with some agreeing on the potential for weight change due to air removal, while others seek further clarification on specific processes and their implications. The discussion remains unresolved regarding the exact impact on weight and the best methods to measure it.

Contextual Notes

Participants mention the need for sensitive scales to detect weight changes and highlight the importance of understanding the specific vacuum process being used, indicating that assumptions about weight changes may depend on the context of the process.

vmedina21
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Hi everyone!

I need help about understanding the Vacuum process, where can I find some information about it? and also

The weight of a material (liquid) change after a vacuum process?

I mean if the weight will be the same if I measure the material before and after the vacuum process?

Please advice
 
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It sounds like you have heard something from someone about this, but you've misunderstood the idea.

"Vacuum Process" is not some specific process. There are several processes that involve operation under vacuum conditions, and all of these are referred to as vacuum processes.

If you have a specific vacuum process in mind, you must describe exactly what this process is, because the generic term "vacuum process" can be used for any of several different processes (eg: contact evaporation, crystal cleavage, STM measurement, cryogenic cooling).

By "vacuum process" if you simply mean subjecting something to high vacuum, then yes, the mass of a liquid under vacuum could be different from outside because of the removal of dissolved gases.

Some links for further reading (preferably, read in the order listed) :

http://www.google.com/search?hl=en&lr=&oi=defmore&q=define:Vacuum
http://www.mcallister.com/vacuum2.html
http://en.wikipedia.org/wiki/Vacuum
 
more details

Thanks for your advice Gokul43201! and for the links they were very useful

I just wanted to know more about the "vacuum process" in general; in order to understand the physical principles behind it.

About the question... specifically I am using a Vacuum Oven with a mechanical vacuum pump, part of my epoxy rubber manufacturing process consist in making vacuum to an specific container of 5 gallons. So i have the doubt if the container weight less after the vacuum process.

I suppose that it is the only way to know if the epoxy rubber was vaccumed?

am i right? or there is another way to know ?

please advice



http://www.lesker.com/CFDOCS/newweb/Technical_Info/BasicVacuum.cfm
http://www.rawbw.com/~rwaits/NCCAVS/effects.pdf
 
Last edited by a moderator:
The purpose of drawing a vacuum over epoxy rubber mixtures is to draw out entrapped air. There should be a small weight change, proportional to the amount of air removed from the mixture. You might try a before and after measurement but you will need a pretty sensitive scale to see the change.
 
Integral,

Thanks for you answer

I will do a weight test before and after the vacuum process to see what happens.

I hope that there is a significant variation so I will be able to determine if whether or not the epoxy rubber mixture go through a vacuum process.
 

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