MIL-DTL-25708F
6.3.2 Band of doubt. A VSWR value is considered to be in the band of doubt if the measured VSWR = (the
maximum allowable) VSWR ± 0.08 (the maximum allowable VSWR-1). If VSWR values are within the band of doubt,
a frequency band of ± 10 percent must be investigated about the point.
6.4 First article. When first article inspection is required, the contracting officer should provide specific guidance to
offerors, whether the item(s) should be a preproduction sample, a first article sample, a first production item, a sample
selected from the first production items, a standard production item from the contractor's current inventory (see 3.2),
and the number of items to be tested as specified in 4.3. The contracting officer should also include specific
instructions in acquisition documents regarding arrangements for examinations, approval of first article test results,
and disposition of first articles. Invitations for bids should provide that the Government reserves the right to waive the
requirement for samples for first article inspection to those bidders offering a product which has been previously
acquired or tested by the Government, and that bidders offering such products, who wish to rely on such
production or test, must furnish evidence with the bid that prior Government approval is presently appropriate for the
pending contract. Bidders should not submit alternate bids unless specifically requested to do so in the solicitation.
6.5 Tin whisker growth. 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 (see 3.3.4). For additional information on this matter, refer to ASTM-B545
(Standard Specification for Electrodeposited Coatings of Tin).
6.6. Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the dating of this document, the U.S.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
is available on their website at https://www.epa.gov/epaoswer/hazwaste/minimize/chemlist.htm. Further information is
available at the following EPA site: https://www.epa.gov/epaoswer/hazwaste/minimize/. Included in the EPA list of 31
priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should be minimized or eliminated
unless needed to meet the requirements specified herein (see Section 3).
6.7 Subject term (key word) listing.
Altitude
Radiation
Attenuation
Salt fog
Fungus
Seal
Impedance
Shock
Nonflammable
Solvents
Polarization
VSWR
6.8 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where
changes from the previous issue were made. This was done as a convenience only and the Government assumes no
liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - AS
Air Force - 11
(Project 5985-2008-015)
DLA - CC
Review activities:
Army - AV
Air Force - 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at https://assist.daps.dla.mil.
17
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