A-A-304C
2.2 Materials. Type I bags shall be made of latex reinforced kraft paper and be capable to withstand moisture exposure in accordance with normal commercial practice. Unless otherwise specified, Type II bags shall be made of the following options, at the choice of supplier:
Option 1 – Kraft paper, 48.8 g/m2 (30 lb) basis weight minimum, laminated to aluminum foil with a water/heat resistant adhesive. The aluminum foil side of the laminate shall be on the inside of the bags.
Option 2 – Kraft paper, 48.8 g/m2 (30 lb) basis weight minimum, with Mylar brand or equivalent inner coating. The inner layers shall consist of the following:
Layer 1 - 16.3 g/m2 (10lb) basis weight LDPE
Layer 2 - 0.0072 mm (0.000285”) metal foil
Layer 3 - 32.5 g/m2 (20 lb) basis weight LDPE
*LDPE - Low density polyethylene
2.3 Physical characteristics. Before the paper is laminated for Type II bags, it shall be tested for Flame Resistance in accordance with TAPPI T 461 as Type I paper. The Char Length determined by this test shall be not more than 110 mm. the laminated material shall have an Internal Tearing Resistance in the machine direction of not less than 52 grams when tested in accordance with TAPPI T 414.
2.4 Style and Capacity. Bags shall be square style or self opening style, at the option of the supplier. The face width shall be not less than 152 mm (6”). The gusset width or the bottom width, which equals 1/2 the perimeter of the top of the bag minus the face width, shall be not less than 76 mm (3”). Unless otherwise specified, the overall height shall sufficient to give a bag capacity of not less than 3.25 Liters. Bag capacity shall be determined through the following equations:
F = face width
P = perimeter of the top of the bag
H = overall height of the bag (excluding the lip)
Capacity of square bags = F[0.5P - F] [H - (0.25P - 0.5P)]
Capacity of self opening bags = F[0.5P - F] [H]
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