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|  MIL-S-45921A(AR)
3.2.3.2 Stock shells.
Stock shells shall consist of
fiberglass reinforced plastic (premix) and reimpregnated glass
rovings assembled in accordance with the applicable drawing.
Stock shells shall be uniform and smooth and shall be free of
cracks, holes, tackiness, blisters, wrinkles, porosity, air
pockets, foreign materials, and other injurious defects.
3.2.3.2.1 Barcol hardness. The average Barcol hardness of
the stock (left-hand and right-hand) 24 hours after molding
shall be not less than 50.
3.2.3.3. Knurled straight pins.
The knurled straight pins
shall be permanently cemented by the adhesive in the locations
specified on the applicable drawings.
3.2.3.4 Screw retaininq plate.
The screw retaining plate
shall be permanently cemented by the adhesive in the location
specified on the applicable drawing.
3.2.3.5 Adhesive.
Prior to cementing, adhesive surfaces
shall be cleaned and free from oil, grease, dirt, sanding dust,
and other contaminates. The adhesive joint areas of the stock
shall be completely filled with adhesive and the adhesive joint
areas shall not show any separation or shrinkage of adhesive when
tested as specified in 4.5.3.3.1 and 4.6.1.
3.2.3.6 Foam.
The foam in the butt end of the stock shall
be uniform and of homogeneous cell structure.
The foam shall be
free of open spaces, blowholes, or unfilled pockets. The foam
shall completely adhere to the skin of the stock shells. The
cellular material except the skin of the accessory holes shall be
uniform and free of voids or open cells exceeding 10 percent of
the total volume with none larger than l/4-inch diameter and not
occurring more than once per two cross-sectional areas when tested
as specified in 4.5.3.3.1 and 4.6.1.
The accessory holes shall
have hard, smooth, nonporous surfaces as specified on the
applicable drawing.
The surface coating shall be uniform and
3.2.3.7 Coating.
complete and shall be completely cured and dried. The surface
coating shall be free of tackiness, soft areas, pin holes,
orange-peal, and thickened drainage areas. The color shall be as
specified on the applicable drawing.
3.2.3.8 Repairing of stock. The stocks shall not be
repaired in any manner except that repairs may be made to the
coating and to the adhesive joint area if the adhesive is clearly
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