PPP-C-1120D
4.5.3 Water resistance and water absorption. Five test specimens, 4 to 6 inches square and containing not less than 20 cubic inches of material shall be weighed to the nearest 0.1 gram. Submerge the specimen for 24 hours in potable water at 75 ±5° F. The specimens shall be submerged a minimum of 1 inch and oriented in a manner so that a minimum of air is entrapped. After 24 hours, remove and let drain on a wire screen for 1 minute and examine the specimens for decomposition. If the specimens are still acceptable then transfer them to a weighing dish and individually weigh to the nearest .1 gram. Specimen percent water absorbed is the
difference between the final weight and the initial weight multiplied by 100 and divided by the initial weight. The percent water absorption for each of the five specimens shall be averaged to determine the sample water absorption value.
4.5.4 Tensile strength. Five test specimens shall be tested. Each specimen shall be 8 inches long and 3 inches wide and of nominal sample thickness. The two opposite ends of the specimen shall be securely clamped with a horizontal distance of 6 inches separating the clamps. A dead weight tensile load of 1.5 psi shall be applied to the specimen midway between the clamps.
Total separation of any one of the specimens within 10 minutes shall constitute failure of the lot.
4.5.5 Dusting. Five 2-inch square specimens shall be cut from each sample unit, cleaned with a brush and then weighed to the nearest 0.001 gram. A 0.75 ±0.01 pound cylindrical weight, having a flat face of 1.5 ±0.01 square inches in area shall be dropped squarely upon each specimen from a height of 10 inches above the specimen. After a total of 10 such impacts, each sample shall be cleaned with a brush and weighed to the nearest 0.001 gram. Specimen weight loss is the difference between the initial and final weighings and shall be expressed in percent of initial specimen weight. The weight losses of the five specimens shall be averaged and the average shall be reported as the sample dusting weight loss.
4.5.6 Hydrogen ion concentration (pH). Place 5 grams of air-dried cushioning material in a
500 mL heat resistant Pyrex Erlenmeyer (or equivalent) flask and add 250 mL of boiling distilled or deionized water free of C02 and having a pH between 6.7 and 7.1. To avoid the tendency of the material to float on the surface, the flask shall be well shaken. Attach a water-cooled condenser and reflux gently for one hour with occasional shaking to ensure that all of the
material is immersed in the water. Stopper the flask, cool the solution to room conditions and determine the pH of the extract electrometrically, using a glass or quinhydrone electrode and calomel cell, or colorimetrically, using isohydric indicators. The average of three separate tests shall be determined. Electrometric determination of pH is preferred for control testing.
4.5.7 Contact corrosivity. Contact corrosivity testing shall be conducted in accordance with
MIL-STD-3010, Test Method 3005 using steel panels only. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD, or in-house contractor, personnel, these personnel need to contact the responsible packaging
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