MIL-PRF-62309G
3.2.3.1.2 Seal adhesion. The seal shall be capable of withstanding a maximum pull of
876 Newtons per meter (N/m) [5 pound-force per inch (lbf/in.)] of length perpendicular to the
surface without any separation (see 4.3.2.1.2).
3.2.3.2 Media. The filtering element media shall be securely bonded to the element
end-caps. The bonding shall be free of porosity, voids, and pin-hole leak paths (see 4.3.2.2).
3.2.3.2.1 Internal tear strength. The filtering media shall be capable of withstanding
40 grams (g) [1.4 ounces (oz)] minimum internal tear resistance without evidence of physical
damage (see 4.3.2.2.1).
3.2.3.2.2 Bursting strength. The filtering media shall withstand differential pressure of
103 kilopascals gage (kPag) [15 pounds per square inch gage (psig)] minimum without evidence
of tearing (see 4.3.2.2.2 and 6.5.1).
3.2.3.2.3 Tensile breaking strength. The filtering media shall withstand
3.6 kilograms (kg) [8 pounds (lb)] minimum in tensile load without evidence of damage
(see 4.3.2.2.3).
3.2.3.3 Pin loading.
3.2.3.3.1 End loading. The element shall be capable of withstanding a compressive end
load without damage, when a 1,334 ± 13 N (300 ± 3 lbf) static load is applied uniformly over a
127 mm (5 in.) diameter circular area (see 4.3.2.3.1).
3.2.3.3.2 Maximum loading. The element shall be capable of withstanding a
compressive, (end to end) load without damage when a 2,669 ± 133 N (600 ± 30 lbf) static load
is simultaneously applied to each clamping pin, totaling 5,338 ± 267 N (1,200 ± 60 lbf)
(see .3.2.3.2).
3.2.3.3.3 Nominal loading. Each of the two spring-loaded pins shall support a preload of
623 ± 133 N (140 ± 30 lbf) at 138.2 mm (5.44 in.) from the rear of the pin to the element stops.
Compression of the seal, and positioning of the pins 131.1 mm (5.16 in.) from the rear of the pin
to the element stops, shall cause the load on each pin to be 1,246 ± 267 N (280 ± 60 lbf)
(see 4.3.2.3.3).
3.2.3.4 Element protection. Protective means shall be provided on the inside and outside
of the element, to securely attached the frame and bond to the element media. In addition,
structural members shall be securely attached to the inside frame of the element. The resulting
assembly shall ensure that any flexure of the internal elements are minimized and do not exceed
1/32 in. (see 4.3.2.4).
3.3 Operating requirements. Each filter element shall provide the following functional,
operational and performance capabilities.
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