A-A-1206A
IV. Report: Weight of mineral, 140 mesh sieve, if any;
Weight of mineral on 325 mesh sieve = percent retained on 325 mesh sieve.
Weight of mineral per 90 sq.in
Backing material. The backing material shall be good quality jeans cloth properly dyed and filled prior to coating.
Adhesive. The adhesive shall be a good quality, animal hide glue base suitable for the purpose intended.
Breaking strength (coated product). The minimum average breaking strength of the crocus cloth, per inch width, shall conform with the following requirements when tested in accordance with the cutstrip method of Method 5102 of Federal Test Method Standard 191A (issue on effect on the date of invitation for bids or request for proposal):
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Machine direction |
Cross direction |
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100 lbs/inch |
45 lbs/inch |
Flexibility. The crocus cloth shall show no evidence of major cracking in the abrasive coating or flaking of the abrasive coating from the cloth backing, when tested as follows:
At least five test pieces 1 inch in width shall be cut longitudinally (direction of warp) from a sheet or roll under test. The test pieces shall be conditioned for not less than 12 hours at 70 degrees plus or minus 2 degrees F., and 50 percent plus or minus 2 percent relative humidity before testing. The specimens shall be flexed with the ends parallel over a 3/16 inch smooth steel rod, securely held in a vise or other suitable means, with the abrasive side away from the rod. They shall be given 20 to and fro motions of approximately 3 inches~ under tension of about 3flpounds at a temperature of 70 degrees plus or minus 2 degrees F. and a relative humidity of 50 percent Plus or minus 2 Percent. Specimens shall be inspected in a flat position for evidence of cracking in the abrasive coating, or flaking of the coating from the cloth backing, as a result of these tests.
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