Ok, I hope I don't sound like too much of an idiot here but I need to ease my mind on some of the materials that are touching my liquid in tanks. I know that stainless steel is ok. But what about these other materials they are using like aluminum and chrome?
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Here’s the problem when someone mentions something like “Aluminum”.
Aluminum is an Element. It is also Extremely Ductile and has Very Low Physical Strengths. What most people want to talk about when they mention “Aluminum“ is an Aluminum Alloy. But what Alloy.
Some Alloys are developed for Higher Physical Strengths but have Poor Corrosion, Like 7xxx series. Others Have Better Corrosion properties but not as much Ultimate Strength, 2xxx series. Some are a Balance of the Two, 6xxx series.
But No Bare Aluminum is considered to be “Safe” when used around Food Products. I say Bare because Aluminum can be Plated, Anodized or Coated so that the Aluminum does not come in contact with the Consumable Product. Ie. The Insides of ALL Aluminum Food or Drink Containers sold in the US must have some type of liner. Usually a sprayed in Resin Coating.
This is the Same with “Copper”.
Copper in an Elemental Form is an Extremely Bad choice to store Food or Liquids. It forms Copper Oxides which can be Very Nasty to the Human Body.
But if Alloyed properly, it is considered “Safe” to use around Food or Liquids. Ie. Copper Pipes for Water Delivery.
So unless someone can tell you what Alloy of things like Copper are safe, they are not correct to say that “copper” is safe. Because there are many Alloys of Copper that are Not.
Aluminum is an Element. It is also Extremely Ductile and has Very Low Physical Strengths. What most people want to talk about when they mention “Aluminum“ is an Aluminum Alloy. But what Alloy.
Some Alloys are developed for Higher Physical Strengths but have Poor Corrosion, Like 7xxx series. Others Have Better Corrosion properties but not as much Ultimate Strength, 2xxx series. Some are a Balance of the Two, 6xxx series.
But No Bare Aluminum is considered to be “Safe” when used around Food Products. I say Bare because Aluminum can be Plated, Anodized or Coated so that the Aluminum does not come in contact with the Consumable Product. Ie. The Insides of ALL Aluminum Food or Drink Containers sold in the US must have some type of liner. Usually a sprayed in Resin Coating.
This is the Same with “Copper”.
Copper in an Elemental Form is an Extremely Bad choice to store Food or Liquids. It forms Copper Oxides which can be Very Nasty to the Human Body.
But if Alloyed properly, it is considered “Safe” to use around Food or Liquids. Ie. Copper Pipes for Water Delivery.
So unless someone can tell you what Alloy of things like Copper are safe, they are not correct to say that “copper” is safe. Because there are many Alloys of Copper that are Not.
Thanks so much Zoidman. What about these....they say they are chrome.
http://www.madvapes.com/Dual-Coil-510-Chrome-Tank-Cartomizer-35ml_p_3446.html
http://www.madvapes.com/Dual-Coil-510-Chrome-Tank-Cartomizer-35ml_p_3446.html
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BTW – Chrome (Chromium) is a Good choice. Sort of.
Chromium in the Presence of Oxygen form Chromium-Oxides at the Surface Boundaries which Inhibited the formation of other Non-Desirable Oxides. This is why Most Stainless Steels Alloys have the Corrosion Resistance that they do. Stainless Steels have Chromium and Nickel as there Major Alloys. (13% Chromium and 3% Nickel to be called Stainless Steel in most circles.)
But the Problem with Chrome is that you don’t make things out of Chromium. You make things out of another Material like Steel and then Chrome Plate it.
But the Chrome doesn’t like to Stick to the Steel Very Well. So Usually you Plate the Steel with Copper and then Plate the Copper with Chrome.
All this is Expensive to do and if the Chromium ever gets Scratched or if there are any Surface Imperfections, the base metal is Exposed and that Defeats the Purpose of Chrome Plating.
Chromium in the Presence of Oxygen form Chromium-Oxides at the Surface Boundaries which Inhibited the formation of other Non-Desirable Oxides. This is why Most Stainless Steels Alloys have the Corrosion Resistance that they do. Stainless Steels have Chromium and Nickel as there Major Alloys. (13% Chromium and 3% Nickel to be called Stainless Steel in most circles.)
But the Problem with Chrome is that you don’t make things out of Chromium. You make things out of another Material like Steel and then Chrome Plate it.
But the Chrome doesn’t like to Stick to the Steel Very Well. So Usually you Plate the Steel with Copper and then Plate the Copper with Chrome.
All this is Expensive to do and if the Chromium ever gets Scratched or if there are any Surface Imperfections, the base metal is Exposed and that Defeats the Purpose of Chrome Plating.
I think in this Case, “Chrome” is referring a Cosmetic Finish. But it could be Chrome Plated.
If you are Really concerned with what your e-Liquids come in contact, I would look closer at the “Plastics” used in the Tank Itself verses the Metal Components.
Do a quick Google search for “Plastics BPA Leaching” to see what I mean.
What type of "Plastic" is the tank made out of?
Thanks so much for your answers Zoidman, I really appreciate it. 
I'm going to try to find out what the plastic is on these tanks. They are made by Smoktech, so I think I will go straight to the source.
I'm going to try to find out what the plastic is on these tanks. They are made by Smoktech, so I think I will go straight to the source.Thanks so much for your answers Zoidman, I really appreciate it.
No Problem.
Most of the Big OEM's are aware of the Potential Problems Associated with certain Plastics and choose “Safer” plastics for Tanks.
Aside from cost, I prefer syringe tanks because the material is meant to hold various liquid solutions that are going to be injected into a person's body, and therefore can be considered reasonably safe. The only thing that might be safer is glass, but of course glass is fragile.
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