In the amount used in juice, haven't heard anything definitive, but I know that plastic syringes definitely do not like it. Very well could have had a hand in that.
I've used TFA Pear quite a bit and haven't had any issue with my plastic syringes or mini vivi nova tanks, but I usually use it between .5 and 4%
Tfa pear definitely cracks tanks.
Based on my numerous google searches I'm pretty sure you're the first person on the internet to say this.
Those plastic tanks are extremely easy to crack. I broke mine the first time I used it. I have ordered some replacements because I want a clear tank and I'm a ham fisted idiot.
Screwing plastic to metal like that can crack them even after you have tightened it and used it. A fast change of temperature can do it. If it's cool from sitting and you heat it up quickly it's possible to crack the tank. That is a tip from a friend who did it last week. He left it in his car overnight and it was 50F and he fired it up on the way to work and the tank crack from the threads on the bottom where the coil heated up the metal.
http://e-liquid-recipes.com/flavors/warnlist
That's why I'm confused it's not mentioned that it cracks tanks anywhere but my mixes have claimed two PC tanks. The first one was much less violent though.
TFA Pear never cracked any of the plastic sections in my kayfuns. I have some Snake oil in one as I speak (Pear at 9%). However, I don't ever use the full plastic M tanks. If you don't want to use the full stainless body of the kayfun, try the glass tanked Eleaf Lemo. It is very kayfun like, pretty much a worked over clone with up to 2-3 times the airflow (adjustable) and IMO it is way better than any fogger currently out.