MIL-C-18312G
The dissipation factor of each sample shall be measured as specified in 4.7.5 at the high test temperature after 24
hours, but not more than 48 hours from the start of the life test, and also at any time during the last 48 hours of the
life test. During these measurements, the dc voltage shall be removed from the capacitor terminals. After the
conditioning, capacitors shall be returned to standard test conditions, and capacitance, dissipation factor, and
4.7.16.2 For group A conformance inspection. Capacitors shall be tested under the same conditions as specified
in 4.7.16.1 except that test duration shall be 250 hours.
4.7.16.3 For group B extended life. Every 2 months, capacitors that have completed the group A test shall be
extended for an additional 750 hours under the same conditions.
4.7.17 Flashpoint of impregnant (see 3.20). The flashpoint of impregnant shall be measured as specified in
ASTM-D92, except that fire point and precision do not apply. The word "impregnant" shall be substituted for the word
"oil" throughout the test method.
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 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.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The capacitors covered by this specification are primarily designed for use in power supply filter
circuits, by-pass applications, and other applications where the ac component of voltage is small with respect to the
dc voltage rating. They are military unique due to the fact that they must be able to operate satisfactorily in military
systems under the following demanding conditions: -55°C to +85°C or +125°C operating temperature range, 15 Gs
of vibration, 100 Gs of shock, 48 hours of salt atmosphere, 1,000 hours of use at the maximum temperature and
140% of rated voltage. In addition, these military requirements are verified under a qualification system. Commercial
components are not designed to withstand these military environmental conditions.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification, the applicable specification sheet, and the complete PIN (see
3.1).
b. Packaging requirements (see 5.1).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are,
at the time of award of contract, qualified for inclusion in Qualified Products List (QPL) whether or not such products
have actually been so listed by that date. The attention of the contractors is called to these requirements, and
manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tested
for qualification in order that they may be eligible to be awarded contracts or orders for the products covered by this
specification. Information pertaining to qualification of products may be obtained from DLA Land and Maritime,
ATTN: VQP, PO Box 3990, Columbus, OH 43218-3990, or by e-mail to vqp.chief@dla.mil. An online listing of
products qualified to this specification may be found in the Qualified Products Database (QPD) at
17
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business