MIL-PRF-25604F
APPENDIX A
UDMH ASSAY, WATER AND AMINES
A.1 SCOPE
A.1.1 Scope. This Appendix describes a Gas Chromatographic method for the determination of
UDMH, water and amine content in the sample. This Appendix is a mandatory part of the specification.
The information contained herein is intended for compliance.
A.2 METHOD
A.2.1 Gas chromatographic method capillary column.
A.2.1.1 Procedure. A 60 meter (m) x 0.53 millimeters (mm), 1.00 micrometer (µm) film thickness
Agilent DB-Wax capillary column, a TCD, with a split injector and a glass wool packed split liner shall be
used. Table A-1 provides a summary of the critical operating parameters. These parameters may vary
depending on GC system, detector brands, and column length and may be adjusted to optimize
component resolution.
TABLE A-1. GC and method parameters
PARAMETER
CONDITION
Injector Port Temp.
150 °C
Injection Mode
Split injection
Sample Volume
3 µL
Split Ratio
1:25
Carrier Gas
He
Control Flow
10 mL/min
Control Mode
Flow
TCD Detector Temp.
210 °C
Equilibration Time
2.00 min
Initial Temp. (T0)
60 °C
Initial Time (t0)
3.00 min
Rate (1)
10 °C/min
Final Temp. (Tf1)
100 °C
Final Time (tf1)
0.00 min
Rate (2)
20 °C/min
Final Temp. (Tf2)
185 °C
Final Time (tf2)
3.75 min
Allow the instrument to stabilize, condition the column and perform check runs by processing
three consecutive injections of 1 - 2 µL of sample. The checks must meet the quality control criteria in
A.2.1.2.
The elution order of possible sample components is as follows:
Air > ammonia > dimethylamine/methylamine (co-elute) > UDMH > water
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