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|  MIL-F-27707H(USAF)
3.3.4 Plastic parts. If used in the construction of the elements, molded
plastic parts shall have the following physical properties:
a.
Tensile strength minimum . . . . . . . . . . . . . . . . . . 4.500 psi
b.
Flexural strength minimum . . . . . . . . . . . . . . . . . 7.500 psi
c.
IZOD impact minimum 1.5 pounds per inch of notch.
3.4 Design and construction. The filter element shall be so designed and con-
structed that no parts will work loose in service. It shall be built to withstand
the stresses, jars, vibrations, and other conditions incident to shipping, storage,
installation, and flight line service.
3.4.1 Functional design. The filter element shall be designed for use in the
Bowser, Incorporated, Bowser-Briggs Filtration Division series 842D filter-
separators. The element shall be as shown on figure 1. The element shall be
provided with an aluminum-alloy center tube. The element base shall be provided
with aluminum alloy threads of the size shown on figure 1. If the threaded
section is a metallic insert, it shall have a minimum outside diameter of
2-1/4 inches. The threads shall be coated with a material to prevent the
element from loosening in service after installation. The coating shall not
prevent the element from being removed. A 3/8-16 UNC-2B stainless-steel nut,
flat stainless-steel washer, and Buna N gasket of suitable size shall be
provided to attach the canister to the element and prevent leakage around the
stud.
3.4.1.1 Compatible fuels. The filter element shall be so designed that it
can be used with fuels conforming to MIL-G-5572 and MIL-T-5624.
3.4.1.2 Gasket. A gasket shall be furnished in each element. The gasket shall
have a 1-1/2-inch inside diameter by 2-inch outside diameter and shall be
1/8 inch thick. The material for the gasket shall be Buns N or other material
compatible with fuels conforming to MIL-T-5624.
3.4.2 Separator canister assembly. When specified (see 6.2), a separator
canister shall be furnished with each element. The canister shall be a
semipermanent separator element normally not needing replacement, and made
entirely from metallic parts except that the end cap may be made of polyester
resin as specified herein, and adhesives may be used, if required. It shall be
of rigid construction and shall be designed to withstand damage during normal
handling and installation. The canister dimensions shall be as shown on figure 2.
The canister shall be constructed of two concentric layers of perforated metal
and wire mesh. The outer layer shall be a covering made from aluminum alloy
metal having a minimum thickness of 14 gage. The perforations shall be
3/16-inch-diameter holes on 5/16-inch centers minimum or 1/4-inch-diameter holes
3
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