MIL-DTL-62547D
could result in leakage at any temperature or over any thermal gradient within the temperature
range specified. Static and dynamic seals, including gland design and mating sliding surfaces
material selection, shall result in minimum dynamic seal(s) friction, negligible breakout
frictional forces after short term or prolonged inoperation and zero stickslip characteristics of
moving or sliding parts during the discharge valve opening process. Silicone seals shall not be
used. Erosion of materials due to liquid and vapor flow shall be negligible and shall not wear
through any protective or antifriction finish or coating. Elastomers which swell or contract when
in contact with Halon 1301 shall not result in leakage or hinder operation at any ambient
temperature or thermal gradient. Plastics that swell when in contact with Halon 1301, such as
ethyl cellulose or cellulose acetate/butyrate, shall not be used. Materials that are soluble in
Halon 1301 shall not be used (see 4.4.1).
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent
possible, provided that the material meets or exceeds the operational and maintenance
requirements and promotes economically advantageous life cycle costs (see 4.4.1).
3.2.2 Dissimilar metals. Contact between dissimilar metal parts within or anywhere on
the extinguisher, which could encourage galvanic action, shall be avoided. Separation of
dissimilar metals shall be accomplished by providing approved protective finishes, coatings or
insulation between the mating materials and shall be in accordance with provision of MIL-STD-
171, or equivalent, which address reduction of corrosion at intermetallic contact points.
Corrosion-resistant materials shall be used whenever possible (see 4.4.1).
3.2.3 Environmental quality (see 4.4.1):
a. The extinguisher shall have a Categorical Exclusion under Section 1508.4 of Title 40
CFR, Parts 1500-1508 by the Council of Environmental Quality.
b. The extinguisher shall meet the requirements of Title 40 CFR, Subchapter R, Toxic
Substance Control Act, Parts 702-775.
3.2.4 Extinguishing agent. The fire extinguishing agent, charged into the extinguisher,
shall be bromotrifluoromethane (CBrF3, Halon 1301) conforming to ASTM D5632, or
equivalent (see 4.4.1).
3.2.5 Nitrogen. The nitrogen used to superpressurize the extinguisher, after charging
with Halon 1301, shall conform to A-A-59503, grade B, type I, class 1, or equivalent (see 4.4.1).
3.3 Design and construction.
3.3.1 Discharge valve. The discharge valve shall be designed to safely contain, and to
electrically or manually discharge liquid and vaporous Halon 1301, which has been
superpressurized with dry nitrogen to 5170 kilopascals (kPa) [750 pounds per square inch (psi)]
at 21 °C (70 °F). It shall be designed for rapid opening and a high rate of expulsion (see 4.4.1).
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