MIL-PRF-24236D
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 No. 24236 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 vqp.chief@dla.mil or
Defense Supply Center, Columbus, DSCC-VQP, 3990 East Broad Street, Columbus, OH 43216-5000.
6.4 Intermetallic contact. The finishing of metallic areas to be placed in intimate contact by assembly presents a
special problem, since intermetallic contact of dissimilar metals results in electrolytic couples which promote corrosion
through galvanic action. To provide the required corrosion protection, intermetallic couples should be restricted to
those permitted by MIL-HDBK-889.
6.4.1 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. For additional information on this matter, refer to ASTM-B545
(Standard Specification for Electrodeposited Coatings of Tin).
6.5 Plastics. Type SDGF in accordance with ASTM 5948 is an acceptable flame retardant material.
6.6 Part or Identifying Number (PIN). This specification requires a PIN that is as described in the appropriate
reference to associated documents (see 3.1).
6.7 Subject term (key word) listing.
Bimetallic
Flame response
Hermetically sealed
Overheat detector
Temperature protection
Thermostatic
6.8 Environmentally preferable material. Environmentally preferable materials should be used to the maximum extent
possible that the material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs. Table VI lists the Environmental Protection Agency (EPA) top seventeen hazardous
materials targeted for major usage reduction. If any of these hazardous materials are required, it is recommended that it
be used only when other materials cannot meet performance requirements.
Table VI. EPA top seventeen hazardous materials.
Benzene
Dichloromethane
Tetrachloroethylene
Cadmium and Compounds
Lead and Compounds
Toluene
Carbon Tetrachoride
Mercury and Compounds
1,1,1 - Trichloroethane
Chloroform
Methyl Ethyle Ketone
Trichloroethyene
Chromium and Compounds
Methyl Isobutyl Ketone
Xylenes
Cyanide and Compounds
Nickel and Compounds
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