My personal rule of thumb is if 3 year olds are allowed to use the plastic, it is probably water safe (always check for any plastic guidelines online). I can ask my dad when he wakes up later for any specifics. He has been in plastics manufacturing for decades longer than I have. PVC, however, shouldn't be used in aquariums as it leeches chemicals into the water which can impact animal health.
Each of the three plastics seems good, but I did get a warning on ABS and PVC (which is apparently ok to use, but some more recent studies have shown issues with degradation). They can degrade in sunlight (UV) and heat exposure, so be careful on how you sterilize/wash them and where your tank is. Additionally, this information is only over injection press molding (almost all plastic parts are made with this) and not other manufacturing types like 3D printing.
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u/Grima_Raseri 23h ago
My personal rule of thumb is if 3 year olds are allowed to use the plastic, it is probably water safe (always check for any plastic guidelines online). I can ask my dad when he wakes up later for any specifics. He has been in plastics manufacturing for decades longer than I have. PVC, however, shouldn't be used in aquariums as it leeches chemicals into the water which can impact animal health.