||MILSPECNAME||This commercial item description covers copper and aluminum metallic wool used as an abrasive for cleaning and polishing. This commercial item description may involve hazardous materials and procedures and does not purport to address the safety or environmental problems associated with it's use. It is the responsibility of the user of this description to consult and establish appropriate safety, health, and chemical disposal practices in accordance with all applicable state, local, and Federal regulations.

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A-A-1044A

4.7 Testing.

4.8 Thickness, types I & II. Measure 25 fibers for maximum lateral dimension under 50x or greater magnification using a microscope with a reticle suitable for measuring the fiber width in thousandths of an inch (see 3.1.3).

4.9 Edge, types I & II. Examine fiber edges under 30x or greater magnification (see 3.2 and 4.6).

4.10 Ductility, type I. Wrap a single fiber taken from each sample unit tightly around a taut wire of the appropriate diameter (see 3.3.1.1). In case of failure, repeat the process using two additional fibers taken from the same sample unit. Failure of either of the additional fibers shall constitute failure of the sample unit.

4.11 Corrosion, type I. Prepare a specimen of the material, approximately 1 inch square. Using a medicine dropper, place 2 drops of 6.5 percent phosphoric acid on the specimen. Examine for evidence of corrosion attack (see 1.1 and 3.3.1.2).

4.12 Elasticity, type I. Measure the height of a tuft 3/4 to 1 inch high taken from each sample unit. Compress the tuft to 50 percent of the original height, and then allow the tuft to spring back toward it’s original shape and measure the new height (see 3.3.1.3).

4.13 Brittleness, type II. Select a specimen of approximately 10 grass from each sample unit. Weigh the specimen accurately and record the weight. Roll the specimen into a ball approximately 2-1/2 inches in diameter, using the palms of the hands (gloves may be worn for protection). The duration of the rolling action shall be between 40 and 50 seconds. At the end of this time, the ball shall be pulled into an oval shape and all loose particles shall be shaken from the pad. The oval shape shall be repeatedly exercised, inverted and reshaken until no further loose particles are observed. The pad shall then be reweighed to determine the percentage of loss (see 3.3.2.2).

4.14 Contour, type II. The contour of the strandle shall be examined at a magnification of 10 to 35 times, using reflected light (see 3.3.2.1). The presence of any of these defects I more than 10 percent of the wool shall be cause for rejection of the lot.