More Stack Exchange Communities – Is Pure Water Very Corrosive

pure water resistivity Purified water is never distributed through stainless steel partly being that concern of contamination, as @chipbuster said.

Overtime on metal surface will build up a layer that has all kind of compounds in them.

Ions get picked up, when water flows through. Anyways, also many pollutants in the air, metal reacts not only with oxygen. Generally, the most major reason would’ve been that glass is better in all respect. Glasswares are relatively stable across variety of pH and very difficult to be oxidized or reduced. The reason glasswares are commonly used in the lab have little to do with pure water. You can see through, glasswares are cheap.

Basically transparent. Needless to say, purified water are actually almost always stored in plastic containers and distributed through plastic tubes. Surely it’s also unwise to use glassware to distribute ultrapure water you will get ion contaminations from glass as well. Generally speaking pure water is less corrosive than water with impurities, water at very high temperatures and pressures is corrosive.

pure water resistivity Ultrapure water eats nearly everything, including Pyrex, if we define corrosivity as impurification of the water.

Then the original post if full of falsehoods, as stated by others.


There are also falsehoods in the replies. You see, proper pH measurement can only be done inline or with proper buffers. UPW ain’t caustic. By default, UPW can only have a pH of 7. For example, conversely, in it’s purest form it being that acidic when exposed to atmosphere being that it readily absorbs CO2, that converts to carbonic acid. Now please pay attention. UPW will corrode iron, brass, poor quality steel. Eventually, it shan’t corrode stainless steel as long as the welds are proper, even thence hard to make SS conducive to corrosion by UPW. Nonetheless, exotic plastics don’t need to be used, similar to PFA, PVDF, Halar, and stuff The possible exception is in a fab of a semiconductor plant.

LCMS grade water sitting in the lab for years.

UPW shan’t corrode Pyrex as stated above.

While Having said this, it will leach some silica and boron, they actually must use special glass. Essentially, distilled water is even made in glass stills for laboratory use. HPLC and LCMS grade water is placed in glass containers, right after all. It won’t corrode it. A well-known fact that is. Impurities from the water will leave residue on the evaporators in the cooling towers and render them useless. Put a brass or iron bolt in distilled water and see what happens compared to tap water. Since residuals will form on the turbine blades and throw them off balance and destroy them, All steam powered plants use UPW. One can’t compare the corrosiveness of tap water and UPW. For example, power plants don’t use UPW as tap water is more corrosive. UPW can be corrosive to other metals since it forms carbonic acid when exposed to air. As a result, since it contains no ions to conduct electricity, Therefore if swimming in a lake of UPW and lightening hits the water you won’t be electrocuted. Meaning does not contain dissolved ions to conduct electricity. In theory, if you throw your TV into a tub full of UPW it won’t short out.

pure water resistivity

By definition, ultrapure water is defined as ~17 dot ‘0 18Meg ohm’ or type I water.

The irony is that the purer the water is the worst And so it’s for you to drink.

Tastes insipid. On top of this, before you can do to much damage you likely will feel sick to the stomach. It ain’t good for you to drink as it has no minerals, even if distilled water ain’t considered UPW. Of course dO NOT DRINK UPW, it will corrode metal fillings, leach calcium from your bones, eat the enamel in your teeth, even can cause your cells to explode. Though, you can denature UPW by mixing it with Tang, powdered drink mix, tea, coffee, and all that stuff It will make very strong tea and coffee. Although, uPW is the strongest solvents known to mankind. That doesn’t mean it will eat through everything.


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