MIL-DTL-10866E
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. Class 1 urea is intended for use in the manufacture of other chemicals.
Class 2 urea is intended for use in the melting of thin layers of ice at temperatures above
-9 °C (15 °F) and for the prevention of ice accumulation on runways during freezing rain (urea is
less corrosive to aircraft structural materials than rock salt (sodium chloride) and calcium
chloride).
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Class of urea required (see 1.2).
c.
The specific issue of individual documents referenced (see 2.2 and 2.3).
d.
Packaging requirements (see 5.1).
e.
Unit quantity (see 5.2).
6.3 Batch. A batch is defined as a quantity of material that has been manufactured by
some unit chemical process or subjected to some physical mixing operation intended to make the
final product substantially uniform.
6.4 Significant places. For the purpose of determining conformance with this
specification, an observed or calculated value should be rounded to the nearest unit in the last
right-hand place of figures used in expressing the limiting value, in accordance with the
rounding method of ASTM E 29.
6.5 Subject term (key word) listing.
aircraft
crystalline
deicing
prilled
runways
shotted
6.6 Changes from previous issue. Marginal notations are not used in this revision to
identify changes with respect to the previous issue due to the extent of the changes.
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