<p>PETG might not be the best for long term UV exposure.</p>

<p>According to Midland Plastics, PETG doesn't hold up well in outdoor applications, and is susceptible to UV degradation. Unless you have an outdoor or UV rated PETG product which will have additional chemicals added to it, it may breakdown more quickly than you would expect. (the link I used was : <a href="http://www.midlandplastics.com/srtd_petg.htm" rel="nofollow noreferrer">http://www.midlandplastics.com/srtd_petg.htm</a>)</p>

<p>Polycarbonate on the other hand does hold up better in outdoor applications and is better suited for long term exposure to UV light. Most quads and RC products you see that have a nice slick looking shell on them, are made from Polycarbonate. That stuff is usually vacuum formed sheets. It does still breakdown but it is a much stronger material. The downside is that PC requires a higher nozzle temperature, than PETG. (The reprap wiki has more info: <a href="http://reprap.org/wiki/Polycarbonate" rel="nofollow noreferrer">http://reprap.org/wiki/Polycarbonate</a>)</p>

<p>That being said PETG is not going to dissolve in sunlight. It will likely last upto a year if not longer depending on usage. If this is your first quad you're making, then odds are you'll have a crash due to hardware failure before excessive UV degradation (at least thats been my experience with prototype aircraft).</p>

<p>Good luck!</p>

CC BY-SA 3.0
2017-03-05T15:46:59.577Z
2017-03-05T15:46:59.577Z
Diesel
<p>Unless you plan to use your copter outside Earth atmosphere or expected lifetime is more than tenths of years, UV degradation should not be a problem for PETG. Some of the net sources indicate the <strong>possibility</strong> of degradation after significant time of <strong>constant</strong> exposure to outdoor conditions (mostly color change), which sounds mostly like absence of practical experience.</p>

<p>Yet if there are any concerns about losing mechanical properties from the sunlight, any opaque lacquer car paint can help to absorb unwanted radiation and add some nicer view to the model. Acrylic paint will also work (tried this once myself) but it may not be suitable for outdoor.</p>

CC BY-SA 3.0
2017-03-02T10:24:33.937Z
2017-03-02T11:38:16.270Z
2017-03-02T11:38:16.270Z
Mikhail Z
<p>I am doing a quad-copter now.</p>

<p>I am not sure what color is the best to use for outdoor durability, especially in sunlight.</p>

<p>They say PETg is the most durable material amongst cheap ones.</p>

<p>But what color to choose: white or transparent? Or it does not matter?</p>

CC BY-SA 3.0
2017-02-28T17:49:53.903Z
The best color for what characteristic? Durability, visibility, or something else?
Davo
CC BY-SA 3.0
2017-02-28T17:53:50.660Z
@Davo, I need quad-copter to be durable at first place. I've read earlier plastics are somewhat vulnerable to sunlight.
Qeeet
CC BY-SA 3.0
2017-02-28T17:56:32.830Z
I don't know why one color would be more durable than another... although white would probably be the most reflective, and have the slowest degradation from sunlight.
Davo
CC BY-SA 3.0
2017-02-28T18:08:20.920Z
@Davo, how about transparent? I guess it's UV light that degrades plastic?
Qeeet
CC BY-SA 3.0
2017-02-28T18:11:04.027Z
I haven't done a comparison; transparent might actually be better. But I expect reflecting the radiation is better than allowing it to pass through every bit of material. And even PETG is more translucent than transparent, so I expect it will be reflecting the light around internally off of the bead boundaries, and actually increasing the degradation. But as I've said, I don't know for sure.
Davo
CC BY-SA 3.0
2017-03-01T10:49:36.130Z
Unless you plan to use your copter outside Earth atmosphere or expected lifetime is more than tenths of years, UV degradation should not be a problem for PETG. Yet if there are any concerns about this, lacquer car paint can help to absorb unwanted radiation.
Mikhail Z
<fdm><print-material><color><pet>
What is the best color of PETg to use for outdoor durability?
Qeeet
# What is the best color of PETg to use for outdoor durability?

(Asked by: username_0 on 2017-02-28)

I am doing a quad-copter now.

I am not sure what color is the best to use for outdoor durability, especially in sunlight.

They say PETg is the most durable material amongst cheap ones.

But what color to choose: white or transparent? Or it does not matter?

**Tags:** fdm, print-material, color, pet
> **Comments:**
> **username_1**: The best color for what characteristic? Durability, visibility, or something else?  
> **username_0**: @Davo, I need quad-copter to be durable at first place. I've read earlier plastics are somewhat vulnerable to sunlight.  
> **username_1**: I don't know why one color would be more durable than another... although white would probably be the most reflective, and have the slowest degradation from sunlight.  
> **username_0**: @Davo, how about transparent? I guess it's UV light that degrades plastic?  
> **username_1**: I haven't done a comparison; transparent might actually be better. But I expect reflecting the radiation is better than allowing it to pass through every bit of material. And even PETG is more translucent than transparent, so I expect it will be reflecting the light around internally off of the bead boundaries, and actually increasing the degradation. But as I've said, I don't know for sure.  
> **username_2**: Unless you plan to use your copter outside Earth atmosphere or expected lifetime is more than tenths of years, UV degradation should not be a problem for PETG. Yet if there are any concerns about this, lacquer car paint can help to absorb unwanted radiation.  

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## 2 answers

### Answer by username_2 on 2017-03-02. Score: 5 | Accepted answer

Unless you plan to use your copter outside Earth atmosphere or expected lifetime is more than tenths of years, UV degradation should not be a problem for PETG. Some of the net sources indicate the **possibility** of degradation after significant time of **constant** exposure to outdoor conditions (mostly color change), which sounds mostly like absence of practical experience.

Yet if there are any concerns about losing mechanical properties from the sunlight, any opaque lacquer car paint can help to absorb unwanted radiation and add some nicer view to the model. Acrylic paint will also work (tried this once myself) but it may not be suitable for outdoor.


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### Answer by username_3 on 2017-03-05. Score: 1

PETG might not be the best for long term UV exposure.

According to Midland Plastics, PETG doesn't hold up well in outdoor applications, and is susceptible to UV degradation. Unless you have an outdoor or UV rated PETG product which will have additional chemicals added to it, it may breakdown more quickly than you would expect. (the link I used was : <http://www.midlandplastics.com/srtd_petg.htm>)

Polycarbonate on the other hand does hold up better in outdoor applications and is better suited for long term exposure to UV light. Most quads and RC products you see that have a nice slick looking shell on them, are made from Polycarbonate. That stuff is usually vacuum formed sheets. It does still breakdown but it is a much stronger material. The downside is that PC requires a higher nozzle temperature, than PETG. (The reprap wiki has more info: <http://reprap.org/wiki/Polycarbonate>)

That being said PETG is not going to dissolve in sunlight. It will likely last upto a year if not longer depending on usage. If this is your first quad you're making, then odds are you'll have a crash due to hardware failure before excessive UV degradation (at least thats been my experience with prototype aircraft).

Good luck!


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