MIL-PRF-17927D
requirements are maintained by the Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. The gasket material covered by this specification is intended to be used in scuttles,
doors, and hatches located in the path of missile blast areas and also in fume-tight doors located in fire zone
bulkheads. The gaskets covered by this document are military unique because they are used in missile blast
areas, which the commercial public does not have access to obtain or use. In addition, the gaskets must be
able to retain fumes and withstand extreme temperature changes from room temperature to temperatures of
1600°F for a minimum of 15 seconds.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of the specification.
b. When first article inspection is required (see 3.1).
c. Size or dimensions required (see 3.47 and 3.8).
d. Testing conditions as required (see 4.4.1).
e. Packaging requirements (see 5.1).
f. Is NEHC toxicity evaluation required? (see 6.5).
g. Is a Material Safety Data Sheet required? (see 6.4).
6.3 Fabrication. There are many material combinations that potentially could meet the requirements of
this document. One possible material combination is as follows (see 6.3.1). Suggested shapes are listed in Table
IV. However, if a gasket is fabricated from these components, there is no assurance that it will meet all the
requirements of this document.
6.3.1 Yarns.
6.3.1.1 Wire-reinforced yarns. Wire-reinforced yarns may consist of three ends of textured continuous
filament glass yarn and two ends of type 304 corrosion resistant steel (CRES) wire yarn. The wire and glass
should be plied in a manner that will secure the glass and wire and prevent skin-back.
6.3.1.2 Wire insertion. The wire should be made of type 304 CRES in accordance with ASTM A 478.
The total cross section of the two wires should be 0.009 ± 0.001 inch in diameter. Any combination of wire
diameters is permitted.
6.3.1.3 Plain yarns. Plain yarns should consist of three ends of textured continuous filament glass yarn
and two ends of synthetic yarn plied together. The synthetic yarn should not represent more than 3 percent by
weight of the plied yarn. The fibrous glass fiber diameter should not be greater than 0.00025 inch.
6.3.2 Glass or wire-reinforced glass braids. The glass metallic braids may be constructed from two
yarns as specified in 6.3.1.1 and 6.3.1.2. The yarn should be uniformly braided over the core. The braid should be
so constructed that there may be a minimum of 14 two -ply yarns per inch in either direction measured at right
angles to the direction of the two -ply yarn. The inner and outer braid should be bonded together with silicone
rubber, except when resiliency is affected (see 6.3.4.1). The outer braid may be covered with silicone rubber to
prevent wicking, to keep down wear, and to permit future top-dressing.
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