What is the best color of PETg to use for outdoor durability?

  • 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?


    The best color for what characteristic? Durability, visibility, or something else?

    @Davo, I need quad-copter to be durable at first place. I've read earlier plastics are somewhat vulnerable to sunlight.

    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, how about transparent? I guess it's UV light that degrades plastic?

    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.

    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

    Mikhail Z Correct answer

    5 years ago

    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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Content dated before 7/24/2021 11:53 AM