A-A-1898 Cushioning Material, Cellulosic, PackagingThis document covers cushioning material in roll and multifold unit forms used for packing applications.

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A-A-1898D

5.2  Inspection requirements.

5.2.1  Sampling.  Samples shall be selected for inspection in accordance with ASQ Z1.4, using the plans specified in table II (see 7.4).  A lot shall consist of a number of sample units manufactured by the same process from the same components at the same time.  Random samples shall be drawn from each lot for the end item inspection.  Unless otherwise specified in the contract or purchase order every lot shall be tested.

TABLE II. Sampling.

5.2.2  Thickness test.  From each sample unit make a 2.54 cm (1 inch) high stack of 10.2 ±0.32 cm (4 ±118 inch) square pieces of the cushioning material.  If the material is 2.54 cm (1 inch) thick or greater, one piece is enough.  If more than one piece of material is used, the measured thickness shall be the measured height of the stack divided by the number of pieces used.  Place a 1.52 ±1.27 cm (6 ±112  inch) square flat load plate that weighs 181.4 ±22.7 grams (0.40 ±0.05 lbs) on top of this stack.  After 1 minute, measure the vertical distance of the stack to the nearest

0.80 mm (1132  inch) between the level surface and the load plate at each of the four corners and record the average.  The average of the four readings shall be the measured thickness.  The percent of nominal thickness shall be calculated as follows:

5.2.3  Strain test.  Take each stack of cushioning material prepared for the thickness test (see

5.2.2) and apply a load resulting in 122 kPascals (3 psi) to this stack for 15 seconds.  After 15 seconds, measure the loaded height at the four corners and record the average (compressed thickness).  The strain shall be calculated as follows:

Strain        =   measured thickness - compressed thickness      x 100 (in percent)                           measured thickness

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