MIL-PRF-23648/19C
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3.18 Seal. When tested in accordance with 4.5, the maximum allowable leakage rate shall be 1 X 10
atmospheric cubic centimeters per second (atm cc/sec). For the purpose of this specification, a
hermetically sealed thermistor is one which is capable of passing the seal test of 4.5. Enclosure materials
shall be ceramic, metal, or glass, or combinations thereof.
3.19 Immersion. The maximum allowable change in zero-power resistance as the result of the
immersion test shall be ±3 percent.
3.20 Resistance to solvents. There shall be no evidence of mechanical damage to the body and the
marking shall remain clear and legible.
3.21 Marking. The thermistors shall be marked in accordance with MIL-PRF-23648.
4. VERIFICATION
4.1 Sampling and inspection. Sampling and inspection shall be in accordance with MIL-PRF-23648.
4.1.1 Qualification seal test. The seal test specified in 4.5 shall be performed prior to the immersion
testing of MIL-PRF-23648, table III, group VI.
4.1.2 Semiannual seal test. The seal test specified in 4.5 shall be performed prior to the immersion test
of MIL-PRF-23648, table VI.
4.2 Terminal strength.
4.2.1 Direct load. Direct load shall be applied gradually until the load reaches 4.5 pounds.
4.3 Solderability (type S leads). The solderability test is applicable to this specification for the type S
leads.
4.4 Resistance to soldering heat (type S leads). The resistance to soldering heat test is applicable to
this specification.
4.5 Seal. Thermistors shall be tested in accordance with method 112 of MIL-STD-202. The following
details shall apply.
a. Test condition: C, procedure III.
b. After test: Thermistors shall be cleaned in alcohol or other suitable degreaser, and allowed to dry
thoroughly.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When actual packaging of material is to be performed by DoD personnel,
these personnel need to contact the responsible packaging activity to ascertain requisite packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activity
within the Military Department or Defense Agency, or within the Military Department's System Command.
Packaging data retrieval is available from the managing Military Departments or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
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