MIL-DTL-38741A
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as conformance inspection (see 4.3).
4.2 Sampling for tests. Sampling may be used for lot acceptance. The material not used
during testing may be returned to the lot after acceptance (see 6.2).
4.3 Conformance inspection. Conformance inspection shall be performed in accordance with
inspection provisions set forth in table I. The characteristics required by table I, when tested in
accordance with 4.4, shall constitute minimum inspections to be performed by the supplier prior
to Government acceptance or rejection by lot. The absence of any inspection requirements in the
specification shall not relieve the contractor of the responsibility of assuring that all products or
supplies, submitted to the Government for acceptance, comply with all requirements of the
contract.
4.4 Test methods.
4.4.1 Assay. The percentage of bromochlorodifluoromethane shall be determined by
programmed temperature gas chromatography using a packed column and flame ionization
detector (FID). Component peak areas are integrated electronically and quantified by the area
normalization-response factor method. Manufacturers may use the test method of 4.4.1.1
through 4.4.1.7 or another method determined acceptable by the procuring agency.
4.4.1.1 Apparatus. The following apparatus is required to determine the percentage of
bromochlorodifluoromethane:
a. Temperature programmable gas chromatograph with dual flame ionization detectors, 500
µL sample loop, and packed column capability. One detector is used for gas analysis; the other is
used as a baseline reference.
b. Electronic integrator or suitable data acquisition system and chromatography software.
c. Packed column, 24 feet by 1/8-inch OD stainless steel, packed with either 1% AT-1000 on
Carbograph 1 [Alltech] or 1% SP-1000 on Carbopak B [Supelco], 60/80 mesh.
d. Sampling apparatus for vaporizing liquid refrigerant samples. The apparatus shown in
figure 1 may be employed and comprises a gas sampling bulb (either 250 mL or 500 mL) wrapped
with fiberglass tape, a vacuum gauge, appropriate valves, and an optional septum.
4.4.1.2 Reagents.
a. The chromatography gases used are UHP helium (carrier gas), UHP hydrogen (detector
fuel), and zero grade air (oxidizer).
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