MIL-PRF-22E
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 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 Defense Supply Center, Columbus, ATTN: DSCC-VQP,
P.O. Box 3990, Columbus, OH 43218-3990
6.4 Derating. It is the intention of this specification to cover resistors capable of full load operation at an ambient
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temperature of 25 C. However, if it is desired to operate these resistors at an ambient temperature greater than
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25 C, the resistors should be derated in accordance with figure 1.
6.5 Supplementary insulation. Resistors should not be used at potentials above ground greater that 500 volts
(250 volts for RP05, RP06, and RP07) (see 3.1), unless supplementary insulation is used.
6.6 Dissimilar metals. Unless protected, metals such as brass, copper, or steel should not be used in intimate
contact with aluminum or aluminum alloys.
6.7 Electrical off positions. Care should be exercised in specifying an electrical off position when resistors are
required to break dc circuit having potentials in excess of 40 volts.
6.8 Tin plate finishes. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker
growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture and can
develop under typical operating conditions, on products that use such materials. Conformal coatings applied over top
of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass, have
shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545 (Standard
Specification for Electrodeposited Coatings of Tin).
6.9 Interchangeability. Resistors in this specification are mutually interchangeable with resistors of the same type
designation acquired under MIL-PRF-22.
6.10 Subject term (key word) listing.
Potentiometer
Electrical off
Rotating contact
Locking bushing
6.11 PIN. This specification requires a PIN that describes technology and appropriate references to associated
6.11.1 Type designation. The type designation system for identifying these parts are as follows:
RP06
2
SB
252
KK
│
│
│
│
│
Electrical off
Shaft and type
Resistance
Style
Resistance
position
of mounting
tolerance
(1.2.1.1)
(6.11.1.1)
(1.2.1.3)
(1.2.1.4)
(6.11.1.2)
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