A-A-52492A
3.1.2 Cover cloth. Cover cloth shall be aramid/glass wire reinforced cloth with silicone rubber on the inside, and coated on the outside with aluminum pigment silicone compound. The base fabric shall be plain weave aramid/glass cloth. Reinforcing wire shall be Inconel or stainless steel of the 300 series and wire diameter shall be American Wire Gage 36 (0.12 millimeter (mm) dia.). The cloth weight shall be 0.90 kg per square meter (m2) (maximum). Wrap and fillings yarns shall be strands of wire and fiberglass completely covered by aramid fibers. The yarn shall be not less than 50 percent (%) aramid. The wire shall not show in the yarn or cloth. The inner and outer coating shall be silicone rubber Grade 5GE605A19B37E026F19Z of ASTM D2000. The value of Z shall be the minimum adhesion to the base fabric of 17.5 N per centimeter (cm) of width.
3.1.3 Cover coatings. When coatings are integrated into the weave of the cloth so that separation of tensile tongue is impossible, adhesion values are assumed to exceed 26.3 N per cm. The inner and outer coating shall be complete and continuous. No exposed yarns shall be visible through the coating. The coating shall be smooth without blisters or depressions. The cloth after coating shall have the following properties:
a. Thickness: Not less than 1.27 mm
b. Weight: 1.575 ±0.16 kg per m2
c. Tear strength: Not less than 89 N
3.2 Design and construction. Seals shall be constructed to conform to the dimensions and form shown in the AED (see 7.2). These seals shall consist of a core of the shape specified (see 2) and a cover (see 3.1.2). The cover shall overlap the core. Its edge shall extend to form the tail.
3.2.1 Core of the bulb. The core of the bulb shall be constructed of Inconel alloy or corrosion resisting stainless steel of the 300 series with not less than 16% chromium and 6% nickel. The filler shall be enclosed in a tubular mesh cover of the same material. The configuration and consistency of the filler, diameter of wire and size of mesh in filler and mesh cover shall be such as to provide the compression and recovery characteristics specified in 3.4, 3.5 and 3.6. When specified in the applicable drawings (see 7.2), the mesh cover shall be drawn over the cut ends of the core, and engaged upon itself in such a way as to form a bound end without distorting the bulb of the seal.
3.2.2 Tail section. The tail section shall be furnished with bolt holes or with cut-outs, as specified in the AED. Sewing shall be of lock stitches and shall count not less than 3 nor more than 5 stitches per running 25 mm. Sewing shall consist of two rows. One stitch line shall be closely adjacent to the core, the other stitch line shall be approximately 6 mm in from the edge of the tail. Bolt holes or cut-outs, when specified, shall not penetrate the stitching adjacent to the bulb.
3.2.3 Length. Length of seals without bolt holes or cut-outs shall not exceed 7.5 meters (m).
3.2.4 Bulb and tail. The dimensions of bulb and tail (overall width) for type I and type II seals shall be as specified in table I.
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