MIL-PRF-62309G
specification sheets), the text of this document takes precedence. Nothing in this document,
however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.1.1 (see 6.3). First article inspection samples, properly marked
with identifying information shall be representative of the unit to be furnished to the
Government. All subsequent air filter elements delivered to the Government shall conform to
these samples in all of their pertinent physical and performance attributes.
3.2 Design, materials and manufacturing processes. Unless otherwise specified, the
design, materials and manufacturing process selection is the prerogative of the contractor as long
as all articles submitted to the government fully meet the operating, interface, support and
ownership, and environment requirements specified.
3.2.1 Materials. Materials shall be uniform and free from imperfections or defects which
affect their serviceability. All metallic parts shall be made from corrosion resistant materials or
treated/plated with corrosion-resistant materials. Asbestos and cadmium materials shall not be
used in any form in any part of the filter. No item, part or assembly shall contain radioactive
materials in which the specific activity is greater than 0.002 microcuries per gram or activity per
item equals or exceeds 0.01 microcuries.
3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials shall 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 6.5.3).
3.2.3 Design and construction. The air filter element, referred to herein as the element,
shall be of the dry type for use as the second stage in a heavy duty two-stage air cleaner with a
25,485 liters per minute (L/min) [900 cubic foot per minute (ft3/min)] rating, and shall meet the
interfaces in accordance with Drawing 11669740 (see 4.3.2).
3.2.3.1 Seal. The seal shall be properly seated and bonded in the seal retaining channel.
The seal base surface shall be free of any release agent. No separation shall exist between the
seal body and the channel, and between channel and end cover. There shall be no excessive
bonding material buildup between the seal and the top edge of the channel walls (see 4.3.2.1).
3.2.3.1.1 Seal compression. The seal shall be capable of being compressed to the stops
6.35 millimeters (mm) [0.25 inch (in.)] over a 152.4 mm (6 in.) section with a force of
289 ± 89 Newton (N) [65 ± 20 pound-force (lbf)] (see 4.3.2.1.1).
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