MIL-DTL-10866E
ASSOCIATION OF ANALYTICAL COMMUNITIES (AOAC) INTERNATIONAL
- Official Methods of Analysis.
(Copies of this document are available from the Association of Official Analytical
Communities, 481 North Frederick Avenue, Suite 500, Gaithersburg, MD 20877-2417.)
2.4 Order of precedence. In the event of a conflict between the text of this document and
the references cited herein, the text of this document takes precedence. Nothing in this document,
however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Appearance.
3.1.1 Class 1. Class 1 urea shall be white crystalline material free from visible
impurities and foreign matter when tested as specified in 4.2.4.1.
3.1.2 Class 2. Class 2 urea shall be in "shotted" or "prilled" form and shall be free
flowing when tested as specified in 4.2.4.1.
3.2 Chemical and physical characteristics. Urea shall conform to the applicable
chemical and physical characteristics of table I when tested as specified therein.
TABLE I. Chemical and physical characteristics.
Class 1
Class 2
Test
Minimum
Maximum
Minimum
Maximum
Characteristic
paragraph
Nitrogen, percent by weight
46.0
46.7
46.0
46.7
4.2.4.2
Water, percent by weight
0.50
4.2.4.3
Biuret content, percent by weight
2.5
4.2.4.4
Ash, percent by weight
0.003
0.1
4.2.4.5
Initial melting point, °C
132.0
133.0
129.0
133.0
4.2.4.6
3.3 Class 2 labeling. Containers of class 2 urea shall be marked in bold characters to
show the following information:
NOTICE
UREA FOR USE IN DEICING AIRCRAFT RUNWAY AND RAMP
AREAS ONLY. NOT AUTHORIZED FOR USE IN DEICING OF OTHER
PAVEMENTS. USE ONLY AT TEMPERATURES ABOVE -9 ºC (15 ºF).
SPREAD AT RATE NO GREATER THAN 1.22 KILOGRAMS PER
SQUARE METER (1/4 POUND PER SQUARE FOOT).
3
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