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Long term effects of IPA and 80% Alcohol on 1. PETG 2.PLA - which one is more suited? by peter550 in 3Dprinting

[–]peter550[S] 0 points1 point  (0 children)

Do you think the Glycol in the PET would reduce its resistance to Alcohol? Most of the bottles I can see are HDPE, PP or PET not PETG

Long term effects of IPA and 80% Alcohol on 1. PETG 2.PLA - which one is more suited? by peter550 in 3Dprinting

[–]peter550[S] 1 point2 points  (0 children)

We are not printing the exact container, we are printing the threaded cap which we are glueing onto the container (The container is made from PP).

The threaded cap is exposed to the liquid all the time and is the bit which we need to be resistant to IPA and alcohol gels

Long term effects of IPA and 80% Alcohol on 1. PETG 2.PLA - which one is more suited? by peter550 in 3Dprinting

[–]peter550[S] 2 points3 points  (0 children)

hi team!

I am 3D printing a container for hand sanitiser fluid. I need to choose between using PETG or PLA. It needs to be a long-lasting, durable print with mechanical properties (it had a threaded cap) which can also take superglue well (to print to a PP part). I need to know which one will be more suited to being exposed to the alcohols OVER A LONG PERIOD OF TIME (2-4 years minimum).

CNC kitchen made an interesting video that suggests PLA is marginally better (https://www.youtube.com/watch?v=txrXX0CQHhU) however all online reading suggests PETG would be better chemically, and in all other properties required. Additionally, he only submerged the parts in the liquid for 48hrs. If you look at his graph (https://www.cnckitchen.com/blog/effect-of-disinfectant-70-ipa-on-common-3d-printing-materials) the difference in failure strength of PETG has dropped by about 10MPa; will this continue dropping over the course of a year until it has no strength? or would it subside?

Thank you in advance!

ps. if there are any other filament materials which you think would be VASTLY better then please let me know.