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(6) Something Safe for Cinnamon and Citrus Flavors
You may have recently found out that there are some flavored e-juices that can cause the plastic in clearomizers and tanks to melt. This is quite simply a chemical reaction between a specific kind of plastic (polycarbonate) and specific flavoring agents.
Why Do Some E-Liquids Melt Plastic Tanks?
This does not mean that these flavors are harmful to vape. The process is a similar chemical reaction as what happens when you pour soda on the corrosion on your car's battery terminal to dissolve it. Obviously, soda does not have the same reaction to your body. How to Clean Battery Terminals with Coke
A list of flavors that can crack or melt clearomizers and clear plastic-tubed tanks
ECF friend The Ocelot has also written on this topic, and has some great pictures of the effects on juice delivery devices in her blog: EEEKKK! It's Melting!
So, what can I use that's safe?
If you are using a cigarette-size battery, a simple solution is a common stainless steel cartomizer.
Pyrex cartotanks are the best choice for people using anything the size of an eGo battery or mod. Examples can be found at Phiniac and IBTanked. These use punched cartomizers inside the tanks.
Pyrex clearotanks such as the Aspire Nautilis, the Kanger Protank and Aerotank, Smok PBC, Smok Pyrex Aro, and Smok Pyrex Vivi Nova are also available. These are glass clearomizers which use replaceable atomizer heads inside the tanks. Replacement heads are not interchangeable between models and brands, but are usually model specific.
Cartotanks that use polypropylene (frosted plastic) as the tube material are safe also, such as the DCT pro tanks from My Vapor Store and the polypro tanks at Texas Tough Tanks.