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What You Shouldn't Put in Stainless Steel Flasks

Updated: Apr 16, 2019



We might have heard that plastic are not safe to use as it release chemicals that are harmful to the body. Read our article on BPA Free Bottles here. And we also

might have heard that stainless steel might be a better option. Moreover, with the vacuum insulation you can keep food or beverages hot or cold for hours, sounds like a good deal to get Stainless Steel flasks.



While it may be true that it is safe to put water in stainless steel flasks, how about putting other food or beverages? A recent study shows that stainless steel might caused metal leaching while exposed to food and beverages.


Stainless steel flasks mostly made of metal alloy formed with mostly iron, chromium and traces of molybednum, nickel, titanium, copper and vanadium. The main component that is harmful to our health are iron, chromium and nickel. If this components, leach to our foods and beverages, it might cause several health problems.


Recent study founds that:

  • Iron, chromium and nickel were all found to leach into both alkaline and acidic foods and beverages, while none of the metals leached into distilled water.

  • Leaching of iron, chromium and nickel was observed from both new and old utensils.

  • Leaching of iron occurred in all foods.

  • Leaching of nickel occurred in curd, fruit juice and pickle (more acid)

  • Leaching of chromium occurred in milk, coffee, and tea (only slightly acid)


Based on this study, the risk of metal leaching on acidic food and beverages is pretty high and there are lots of food and beverages that contains acidic properties, including milk, coffee, juices and curds.


The takeaway is that we need to be more cautious in what we put in our containers and certainly we might need to consider to choose other material alternatives such as glass or porcelain that is much safer.

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