MIL-STD-981C
5. DETAILED REQUIREMENTS
5.1 Materials.
5.1.1 Outgassing. Materials used in nonhermetic sealed devices for spaceflight application must not exceed a maximum total mass loss (TML) of 1.0 percent and maximum collected volatile condensable material (CVCM) of 0.1 percent when tested in accordance with ASTM-E-595. (See 6.2)
5.1.2 Hydrolytic stability. When requested by the acquiring activity: hydrolytic stability of any polymeric materials used must be verified by test data. In the absence of hard data, samples of any polymeric material used shall be cast into blocks approximately 2 inches square by 1/2 inch thick. The shore hardness shall be measured in accordance with ASTM-D-2240. The samples shall be exposed to an atmosphere of 71°C, 95 percent relative humidity for 1000 hours. The shore hardness shall again be measured and samples examined for liquid reversion. Materials shall show no visible reversion to the liquid state and any decrease in hardness shall not exceed 30 percent.
5.1.3 Tapes, films and insulating materials. Insulating materials or combinations of insulating materials shall have a minimum RMS dielectric strength of at least twice the maximum peak operating voltage to be induced between coil winding layers, or twice the RMS dielectric withstanding voltage to be applied between the coil winding and ground, or twice the dielectric withstanding voltage to be applied between the coil winding and other coil windings to be insulated from it. These requirements shall be met at the maximum operating temperature. Devices with materials stresses greater than 100 volts/mil due to the maximum operating voltage shall be tested for corona discharge in accordance with MIL-PRF-27.
5.1.4 W ire.
5.1.4.1 Magnet wire. Magnet wire shall conform to and be of the types and sizes specified in MW-
1000 and shall be of the appropriate class for the maximum temperature within the winding. Magnet wire used for coil winding shall conform to the size limits of Table II as absolute limits. Temperature rise limits must also be observed in selecting wire sizes. Procuring activity approval shall be required when other types and sizes of magnet wire are used.
TABLE II. Wire Limitations for Magnet Wire (see 5.1.4.1).
Family |
Minimum Wire Size 1/ (AWG) |
|
Class S |
Class B |
|
03, 04, 36, 37, 40, and 41 11, 12, 13, 14, 20, 21, 31, 50, 51 and 52 |
38 44 |
44 50 |
1/ Procuring activity approval shall be required when other sizes of magnet wire are used.
5.1.4.2 Insulated wire. When insulated wire is used as wire terminals, the wire shall be of the types and sizes covered in SAE-AS22759. Wire size shall conform to the limits of Table III. Procuring activity approval shall be required when other types and sizes of insulated wire are used as terminals.
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