<p>I have tried to use PETG grid to hold my ABS models above the acetone for vapor smoothing. Specifically, I have used Prusament PETG in the Prusa Orange colors.</p>
<p>After a few hours acetone turned orange, and grid turned soft and gooey. Can't tell if all PETG will be affected, but this one sure is.</p>
<p>Element below was flat and stiff.
<a href="https://i.sstatic.net/oJKMzz1A.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/oJKMzz1A.jpg" alt="Photo of the crate" /></a></p>

CC BY-SA 4.0
2024-05-11T21:32:23.610Z
2024-05-11T21:44:50.187Z
2024-05-11T21:44:50.187Z
Mołot
<p>To my understanding all PETG is vulnerable to different solvents to a certain degree.
Despite PET being resistant to acids of many kinds, hence why it is used in plastic bottles and plastic-ware, this does not transfer over.</p>
<p>Nearly all filaments are incapable of handling the stronger kinds of acids, and although I cannot speak for the manufacturers on Amazon, poor quality will inexorably aggravate the thermoplastic more-so.</p>
<p>If it's any consolation, most/any filaments available are not remarkably chemically stable, least of all against organic solvents.</p>

CC BY-SA 4.0
2022-10-01T01:59:50.330Z
Do you have a source for why PETG would be affected by solvents where PET is not?
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2022-10-01T02:19:45.057Z
Sadly, no. The only sources I can find state that PET is chemically stable, or that PETG is not. You, good sir, have pushed my casual research abilities to the limit!
Higgs Foresterr
CC BY-SA 4.0
2022-10-01T01:47:59.060Z
2022-11-01T16:52:13.860Z
2022-11-01T16:52:13.860Z
Higgs Foresterr
<p>I can't seem to find any reliable answer to this question. My understanding was always that PETG should be solvent-resistant, including to acetone, but parts printed from the various &quot;PETG&quot; filaments I have range from utterly falling apart (layer delaminations, outright ripping under tension) to deformation and smoothing of corners when soaked in acetone. Parts printed in actual PET are unaffected, as expected.</p>
<p>Is this an expected consequence of the modification to PET that produces PETG, or is it a sign that lots of filament vendors are deceptive and shipping some weird garbage and calling it &quot;PETG&quot;?</p>

CC BY-SA 4.0
2022-09-10T00:40:43.083Z
Yeah many people have has this problem, this should help a lot https://www.reddit.com/r/3Dprinting/comments/p8c85d/which_brands_of_petg_arearent_affected_by_acetone/#:~:text=It's%20well%20documented%20that%20PETG,are%20often%20unaffected%20by%20toluene.
F.Ahmed
CC BY-SA 4.0
2022-09-10T01:27:13.887Z
@F.Ahmed: Could you expand that into an answer?
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2022-09-10T09:25:54.897Z
It depends on the brand, and yes it does seem some manufacturers are selling fake PETG , or adding some other material to it
F.Ahmed
CC BY-SA 4.0
2022-09-10T09:27:38.203Z
Any cubic filament and ICE filaments seem to be unaffected and are cheap on Amazon
F.Ahmed
<filament><print-material><petg>
Is real PETG softened/degraded by acetone?
R.. GitHub STOP HELPING ICE
# Is real PETG softened/degraded by acetone?

(Asked by: username_0 on 2022-09-09)

I can't seem to find any reliable answer to this question. My understanding was always that PETG should be solvent-resistant, including to acetone, but parts printed from the various "PETG" filaments I have range from utterly falling apart (layer delaminations, outright ripping under tension) to deformation and smoothing of corners when soaked in acetone. Parts printed in actual PET are unaffected, as expected.

Is this an expected consequence of the modification to PET that produces PETG, or is it a sign that lots of filament vendors are deceptive and shipping some weird garbage and calling it "PETG"?

**Tags:** filament, print-material, petg
> **Comments:**
> **username_1**: Yeah many people have has this problem, this should help a lot https://www.reddit.com/r/3Dprinting/comments/p8c85d/which_brands_of_petg_arearent_affected_by_acetone/#:~:text=It's%20well%20documented%20that%20PETG,are%20often%20unaffected%20by%20toluene.  
> **username_0**: @F.Ahmed: Could you expand that into an answer?  
> **username_1**: It depends on the brand, and yes it does seem some manufacturers are selling fake PETG , or adding some other material to it  
> **username_1**: Any cubic filament and ICE filaments seem to be unaffected and are cheap on Amazon  

---

## 2 answers

### Answer by username_2 on 2024-05-11. Score: 2

I have tried to use PETG grid to hold my ABS models above the acetone for vapor smoothing. Specifically, I have used Prusament PETG in the Prusa Orange colors.

After a few hours acetone turned orange, and grid turned soft and gooey. Can't tell if all PETG will be affected, but this one sure is.

Element below was flat and stiff.
[![Photo of the crate](https://i.sstatic.net/oJKMzz1A.jpg)](https://i.sstatic.net/oJKMzz1A.jpg)


---

### Answer by username_3 on 2022-10-01. Score: 0

To my understanding all PETG is vulnerable to different solvents to a certain degree.
Despite PET being resistant to acids of many kinds, hence why it is used in plastic bottles and plastic-ware, this does not transfer over.

Nearly all filaments are incapable of handling the stronger kinds of acids, and although I cannot speak for the manufacturers on Amazon, poor quality will inexorably aggravate the thermoplastic more-so.

If it's any consolation, most/any filaments available are not remarkably chemically stable, least of all against organic solvents.

> **Comments:**
> **username_0**: Do you have a source for why PETG would be affected by solvents where PET is not?  
> **username_3**: Sadly, no. The only sources I can find state that PET is chemically stable, or that PETG is not. You, good sir, have pushed my casual research abilities to the limit!  

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