MIL-PRF-55365H
6.4 Qualification. With respect to products requiring qualification, awards will be made only for products that are,
at the time of award of contract, qualified for inclusion in Qualified Products List 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. The activity responsible for the Qualified Products List is the ARMY CECOM RDEC, ATTN: RDER-
PRT, Fort Monmouth, NJ 07703-5023. An online listing of products qualified to this specification can be found at
6.4.1 Copies of SD-6. Copies of SD-6, "Provisions Governing Qualification". A copy of this document is available
online at https://assist.daps.dla.mil https://assist.daps.dla.mil/quicksearch/ or from the Standardization Order Desk,
700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.
6.5 Standard capacitor types. Equipment designers should refer to MIL-HDBK-198, "Capacitors, Selection and
Use of", for standard capacitor types and selected values chosen from this specification. MIL-HDBK-198 provides a
selection of standard capacitors for new equipment design.
6.6 Soldering heat. Caution should be exercised when subjecting these sample units to soldering heat. Preheat
and soldering exposure times and temperatures should be held to a minimum.
6.7 Weibull FRL determination. Weibull FRL determination is based on lot by lot, 100 percent quality conformance
accelerated FR life testing. For example:
2,500
Capacitors have a voltage rating (Vr) of 50 V dc;
hours Weibull life test as 65 V dc voltage applied (Va);
X40
accelerated factor for Va/Vr = 1.3000.
X279.1496
27, 914, 960
Accelerated part hours
Weibull FRL's are determined from actual lot performance data. Exponential FRL determination starts with
several production lots which may be included in the same inspection lot. For example, 4 production lots of
2,500 capacitors having a voltage rating of 50 V dc are offered for inspection in the same inspection lot.
Capacitors have a voltage rating (Vr) of 50 V dc;
10,000
X40
hours voltage conditioning at 50 V dc minimum;
400,000
part hours, however, exponential lot voltage conditioning performance data are not used to
determine FRL's.
110
Samples are drawn from the inspection lot of 10,000 capacitors;
hours group C life test at 50 V dc voltage applied;
X2,000
220,000
part hours, however, data accumulated and used to determine FRL's.
10
Samples selected on completing each group C inspection;
hours continuation life testing to 10,000 hours;
X9,760
97,600
rated condition part hours for FRL maintenance.
Exponential FRL's are based on the aggregate averages of a few samples drawn from many lots maintained in
accordance with MIL-STD-690.
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