MIL-PRF-26536F
4.2.2 Sampling tests. The propellant shall be selected according to 4.2.2.1 and subjected to the
tests indicated in Table I as described under 4.3.
4.2.2.1 Sampling plan. Unless otherwise specified (6.2), each filled shipping container shall be
considered a lot and shall be sampled.
4.2.2.1.1 Sample. A sample consists of not less than 600 milliliters (mL) of propellant when
tested to standard grade requirements and not less than 1500 mL when tested to monopropellant and
high purity grade requirements. Unless otherwise specified, quality conformance tests shall be made on
the sample of propellant taken directly from the shipping container. When required, the sample shall be
forwarded to a laboratory designated by the procuring activity for subjection to the quality conformance
tests specified herein. The bottle intended for sampling shall be specially cleaned and handled according
to the procedure described in ASTM D2276 Section 10 with the exception listed in 4.3.3d. Sampling shall
be conducted in such a manner that atmospheric exposure of the contents of the shipping container and
the sample is minimized.
4.2.3 Rejection. When any sample of the propellant tested in accordance with 4.3 fails to
conform to the requirements specified herein, the entire lot represented by the sample shall be rejected.
4.3 Test methods.
4.3.1 Examination of product. The propellant shall be visually examined while performing test
specified in 4.3.3 to determine compliance with the requirement as specified herein. Examination to
ensure that the material conforms to 3.4 shall be conducted after the sample has been transferred to the
500 mL calibrated cylinder for standard grade or to a 1000 mL graduated cylinder for monopropellant and
high purity grades.
4.3.2 Hydrazine assay and water. The propellant and water content of the sample shall be
determined by one of the Gas Chromatographic (GC) methods described in Appendix A. In case of a
dispute, the packed column method (A.2.1) shall be the referee.
4.3.3 Particulate. The propellant sample shall be tested gravimetrically for contamination in
accordance with ASTM D2276, with the following exceptions:
a. Mix the sample thoroughly without exposure to air. Immediately pour 500 mL of the sample
into a clean 500 mL graduated cylinder for standard grade. For monopropellant and high purity grades
pour 1000 mL of sample into a clean 1000 mL graduated cylinder.
b. Use a Mitex disc polytetrafluoroethylene (PTFE) hydrophobic, 10 µm, 0.47mm, white filter for
standard grade, and a 5 µm, 0.47mm, white filter for monopropellant and high purity grades or equivalent.
c. Set oven temperature to 70°C (158°F).
d. Filtered isopropyl alcohol shall be used for rinsing the sample bottle and filter holder instead of
petroleum ether specified in ASTM D2276.
4.3.4 Chloride. The chloride level shall be determined by methods based on accepted scientific
chemical principles, such as ion chromatographic techniques (EPA 300.0), or one of the methods
described in Appendix B (colorimetric with mercuric thiocyanate or combinations of silver nitrate and/or
+
specific ion electrodes (Ag /AgCl)). In case of a dispute, the specific ion electrode method (B.2.1) shall
be the referee.
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