اسید فسفریک ایرانی با قیمت و کیفیت عالی.
ROFL!
Leave it to the Mullahs to figure the Kalifphoneyah Soviet Socialist Republic is already part of the hegemon of China and Russia and open to Iranian trade!
Smart folks. Dreadfully insane managerial class = economic marriages made in fantasyland!
Go figure!
"It depends" Sometimes they simply reduce the free hydration level, Bill. Put NOTHING "in". Take water OUT.
Look up "molality".
Acids nor caustics are not necessarily "watery" in purest form Some are more akin to salt, powder, wax, oil, treacle, ice, or soap flakes.
IF. repeat IF, one can keep them
dry enough.
As most are highly hygroscopic, industrial storage and shipping is most often done with a certain specified and standardized percentage of solvent - water, usually.
Anything else can be an ephemeral and costly pain in the arse to maintain - goes sideways soon as the container is opened even to "dry" air. Or so one THOUGHT it was! See also "fuming" Nitric acid.
Difference Between Fuming Nitric Acid and Concentrated Nitric Acid | Compare the Difference Between Similar Terms
Less nasty, but still not to be trifled with, crystal-forming or "glacial" Acetic acid vs common white vinegar is another example.
FWIW, Naval Jelly is a nuisance to dilute, but one can do it. I use it that way most of the time.
As to the roof flashing, Use it "fairly strong". Clear it, per directions.
And then.. come back with a
much more dilute solution and LEAVE it.
You should get the thin frosty grey of phosphatized Iron. Poor-boy's counterpart to "Bonderizing" as they called it back when the auto industry began to brag about it ages ago.
What is difference between bonderizing & phosphatizing? - FAQ Door Questions - CURRIES, ASSA ABLOY, Hollow, Metal, Steel, Doors, Frames, Energy Efficent, Hurricane, Tornado, Storm
I have half a dozen of those steel fire doors. Either way, if done thin and sparse it clings tightly... and holds paint like a b***dy magnet.
Rustoleum "hammer finish" doesn't even need a primer. Rusty steel beams and lintels I've done that way still look great a dozen years on.