- White fuming nitric acid
White fuming nitric acid (WFNA) is a storable liquid
oxidizerused with kerosene and hydrazine rocket fuel. It consists of nearly pure nitric acid(hydrogennitrogenoxygen3). WFNA is commonly specified as containing no more than 2% waterand less than 0.5% dissolved nitrogen dioxideor dinitrogen tetroxide.
WFNA was sometimes used with an inhibitor compound to reduce corrosiveness, often
hydrogen fluoride. Without inhibitors, WFNA will corrode nearly all structural metals. Inhibited WFNA is often called IWFNA. The hydrogen fluoride addition causes formation of protective layer of fluoride on the metal surfaces.
WFNA as an oxidizer has somewhat less performance than
red fuming nitric acidbut is considerably safer (though extremely corrosive), as it has little to no dissolved nitrogen tetroxide, which is an extremely toxic and volatile chemical. If not inhibited, it will form nitrogen tetroxide on contact with most metal and some organic materials.
WFNA and IWFNA are considered
hypergolicwith a long list of other propellants, including:
* [http://www.npi.gov.au/database/substance-info/profiles/65.html National Pollutant Inventory - Nitric Acid Fact Sheet]
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