A-A-50435 Ropes (Aramid)This commercial item description covers four strand Aramid Fiber Rope which is intended for use as mooring lines and floating dry dock tending lines.

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A-A-50435B

4.4 ELONGATION. The elongation shall be determined in accordance with method 6015 of Fed Std 191 except the length shall be measured when the load applied during the test is 30 percent and 50 percent of the minimum breaking strength of the specimen being tested. A stress-strain curve shall be plotted to the rope’s breaking strength.

4.5 FAILURE MECHANISM. The failure mechanism shall be determined by testing one rope sample from each lot. The distance between the outer ends of the splices shall be 16 meters (50 feet) in length. The sample failure will be considered satisfactory if the time between the first and second ruptures of the strands is at least 10 seconds when tested in accordance with method 6015 of Fee Std 191. This sample shall meet the breaking strength requirements of Table III.

4.6 LAY LENGTH. The lay length shall be determined in accordance with method 6000 of Fed Std 191.

4.7 DETERMINATION OF SPLICEABILITY. A breaking strength specimen shall be prepared and tuck spliced with the lay at each end with six full strand tucks. The specimen shall then be allowed to rest for 24 hours. Four of the tucks shall then be backed out of the rope. The portion of the rope from which the tucks are removed shall be examined for distortion of the strands.

4.8 TEST PROCEDURE. The manufacturer shall submit testing procedures in writing to the Government Inspector prior to any testing.

4.8.1 SAMPLE IDENTIFICATION. Each sample unit or sample specimen shall be marked for identification in determining the lot or sample unit from which the specimens were taken.

CONTRACTOR CERTIFICATION. The contractor shall certify and maintain substantiating evidence that the rope offered meets the characteristics of this Commercial Item Description, and that the product conforms to the producers own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract.