MIL-PRF-22097J
4.7.19.3 Bend (applicable to terminal types P, W, X, and Y only). Resistors shall be firmly clamped and each
terminal shall be bent through a 90 degree point .125 inch (3.18 mm) from the body of the resistor, with the radius of
the curvature at the bend approximately .03125 inch (0.7938 mm). The pin shall be returned to the original position,
bent 90 degree in the opposite direction, and again return to the original position. At the conclusion of the test, the
resistors shall be examined for evidence of mechanical damage and tested for electrical continuity.
4.7.20 Solderability (applicable to terminal types P, W, X, and Y only). Resistors shall be tested in accordance
4.7.21 Immersion (not applicable to L terminations). The surface shall be cleaned of any foreign matter
immediately before immersion (see 3.26).
Precondition: Precondition resistors in an oven at 125OC ±5OC for 13 minutes ±2 minutes, or use a
a.
fluorocarbon bath maintained at 125OC ±5OC for a period of 1.5 minutes ± .5 minute. Upon completion of
precondition, allow resistors to stabilize to room temperature for approximately 13 minutes ±2 minutes.
Immersion: Immerse resistors (not to exceed 30 samples) into a bath of fluorocarbon bath held at 85°C
b.
+5OC, -0OC for a period of 60 seconds ±5 seconds. The resistor shall be completely submerged in the bath,
with no part at a depth of less than 1 inch. Resistors shall be shaken for a maximum of 5 seconds and shall
remain in the bath for a period of 1 minute ±5 seconds. Visually examine resistors for inadequate seals, as
evidenced by a continuous stream of bubbles emanating from any concentrated point on the resistor.
c.
Dye penetrant verification: A five piece sample of the product exhibiting inconclusive evidence of
compliance to immersion requirements (see 3.26), shall be preconditioned in an oven, stabilized at 125OC
±5 C for 13 minutes ±2 minutes, or preconditioned in a fluorocarbon bath maintained at 125 C ±5 C for 1
O
O
O
minute ±5 seconds and immediately upon removal (within 5 seconds), shall be submerged in a dye
penetrant solution for 30 seconds minimum. The dye penetrant solution shall consist of 0.1 grams per liter,
or equivalent, of a soluble stain dye such as crystal violet dissolved in deionized water maintained at room
temperature until external surfaces are dry. The samples shall then be carefully opened and examined
under 10X to 30X for evidence of dye penetration into the sealed cavity. Evidence of such penetration
verifies loss of immersion seal, and lack of such evidence verifies compliance to the requirements.
4.7.22 Fungus. Resistors shall be tested in accordance with method 508 of MIL-STD-810. Resisters shall be
inspected for evidence of mechanical damage (see 3.27).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Service or Defense Agency, or within
the military services system commands. Packaging data retrieval is available from the managing Military Department's
or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Resistors covered by this specification are intended for use in electronic equipment, and are
used for matching, balancing, adjusting circuit variables in computers, telemetering equipment, and other critical
applications. Resistors covered by this specification are unique due to the fact that these devices must be able to
operate satisfactorily in military systems under the following demanding conditions: 20 Gs of high frequency
vibration, 100 Gs of shock (specified pulse), undergo moisture resistance, setability, and salt corrosion test. In
addition these military requirements are verified under a qualification system. Commercial components are not
designed to withstand these military environmental conditions.
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