MIL-PRF-15305F
4.6.14 Moisture resistance (grades 1 and 2 only) (see 3.17). Coils shall be tested in accordance with method 106
of MIL-STD-202. The following details shall apply:
a. Mounting On racks. Cylindrical insulated coils shall be soldered by their leads to rigid mounts or
terminal lugs. The spacing of the mounts or terminal lugs shall be such that the length of each coil
lead is approximately 0.25 inch when measured from the edge of the supporting terminal to the coil
body. For polarization the coils shall be covered with a flat, corrosion resistant metal strap whose
width is equal to the length of the coils and of sufficient thickness to be rigid. A 0.075 inch thick layer
of conductive, moisture resistant, resilient material, having a resistivity of less than 1000 Ω cm, shall
be bonded to the surface of the strap next to the coils. Sufficient contact pressure shall be maintained
by applying a compressive force between the strap and a cylindrical, corrosion resistant,
nonconducting rod held beneath the coils, as shown in figure 2. The mounting strap may be used to
cover one or more coils at a time. All mounting straps shall be removed to perform step 7a and shall
be replaced prior to returning the coils to the humidity chamber. Step 7b shall not be applicable.
b. Polarization - Unless otherwise specified (see 3.1), during steps 1 to 6 inclusive, a polarizing
voltage of 100 V dc shall be applied. The voltage shall be positive with respect to the mounting
hardware or case. For coils having no mounting hardware, the polarizing voltage shall be applied as
specified (see 3.1).
c. Final measurements Following the 1-1/2 to 3-1/2 hour conditioning period, unless otherwise specified
(see 3.1), the units shall be removed to room ambient conditions. The specified electrical characteristics
corrosion.
4.6.15 Fungus (see 3.18). Unless certification is provided, coils shall be tested in accordance with method 508 of
MIL-STD-810.
4.6.16 Solderability (see 3.19). Coils shall be tested in accordance with method 208 of MIL-STD-202. (both leads
on each unit shall be tested.)
4.6.17 Resistance to solvents (see 3.20).
Coils shall be tested in accordance with method 215 of MIL-STD-202.
The following details shall apply:
a. Portion of specimen to be brushed Marked portion of coil.
b. Number of specimens to be tested See table IV.
c. Permissible extent of damage to the specimen See 3.20.
4.6.18 Flammability (see 3.21). Coils shall be tested in accordance with method 111 of MIL-STD-202. The
following details and exceptions shall apply:
a. Point of impingement of applied flame The flame shall be applied to the body and one end of each coil.
b. Allowable time for burning of visible flame on specimen - 3 minutes maximum.
c. Examinations during and after test Coils shall be examined for evidence of violent burning which results
in an explosive type fire, dripping of flame material, and visible burning which continues beyond the
allowable duration after removal of the applied flame.
5. PACKAGING.
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When the 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 activities within the Military Service or Defense
Agency, or within the military service's 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.
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