<p>The amount of vacuum pressure required to draw out all the bubbles is likely dependent on the specific weight and chemical composition of the resin you are using. That should be in your resin's spec. sheet or technical data available from the manufacturer. </p>

<p>Or you could just eyeball it like blacksmith37 says. </p>

CC BY-SA 4.0
2020-05-15T04:12:14.640Z
2020-05-15T04:12:14.640Z
rebusB
<p>I’ve been trying to figure out how much psi I need to get air bubbles out of resin when casting. Does anyone have experience with this? Can anyone tell me what amount of pressure will get rid of air bubbles?</p>

CC BY-SA 4.0
2020-02-03T09:18:04.610Z
Positive pressure? How are you applying it to the resin? Vacuum is used to get bubbles out in many cases, while pressure only shrinks them
Chris H
CC BY-SA 4.0
2020-02-05T00:49:12.190Z
For thin applications, I use a heat gun, but that's to dry the air and put CO2 across the resin to pop the surface bubbles, not for any air pressure reason.
computercarguy
CC BY-SA 4.0
2020-03-06T16:08:27.843Z
When applying vacuum to remove air a clear glass like a "bell jar" is useful to see if the air has been removed.
blacksmith37
<casting><epoxy-resin>
Will 20 psi get out air bubbles when resin casting?
Michael
# Will 20 psi get out air bubbles when resin casting?

(Asked by: username_0 on 2020-02-02)

I’ve been trying to figure out how much psi I need to get air bubbles out of resin when casting. Does anyone have experience with this? Can anyone tell me what amount of pressure will get rid of air bubbles?

**Tags:** casting, epoxy-resin

> **Comments:**
> **username_1**: Positive pressure? How are you applying it to the resin? Vacuum is used to get bubbles out in many cases, while pressure only shrinks them  
> **username_2**: For thin applications, I use a heat gun, but that's to dry the air and put CO2 across the resin to pop the surface bubbles, not for any air pressure reason.  
> **username_3**: When applying vacuum to remove air a clear glass like a "bell jar" is useful to see if the air has been removed.  

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## 1 answers

### Answer by username_4 on 2020-05-15. Score: 0

The amount of vacuum pressure required to draw out all the bubbles is likely dependent on the specific weight and chemical composition of the resin you are using. That should be in your resin's spec. sheet or technical data available from the manufacturer.

Or you could just eyeball it like username_3 says.


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