RR-F-191/1F
4.4.3 Tensile test of steel wire. The steel wire shall be tested for tensile strength in accordance with ASTM A370 (see 3.2).
4.4.4 PVC coating tests.
4.4.4.1 PVC coating thickness. Determine thickness of PVC coating by stripping the coating and measuring the diameter of the wire as in 4.3.1. One-half the difference between this measurement and the outside diameter of the coated wire will be used to determine the thickness of the coating for conformance to 3.7.
4.4.4.2 Accelerated aging of a PVC coated wire. A sample of PVC coated wire from which the fabric is woven shall be subjected to accelerated aging by exposure for 1,000 hours at a black panel temperature of 145° ± 9° Fahrenheit (F) (63° ± 5° Celsius (C)) in accordance with ASTM D1499. After completion of this aging, the coated wire shall be examined to determine compliance with 3.7.3. Shrinkage of the coating of more than 1/16 inch per foot of length, significant visual change in color or gloss, or breaks, cracks, crazing, crumbling, or other visual forms of failure shall be cause for rejection. In addition, samples of the coated wire which have completed this aging process must meet the requirements of the mandrel bend test of 4.4.4.3.
4.4.4.2.1 Frequency of test. Unless otherwise specified (see 6.1), the test for accelerated aging shall be performed on the initial inspection, and thereafter only when changes are made in the PVC coating.
4.4.4.3 Mandrel bend test. After the sample has been subjected to the accelerated aging of
4.4.4.2, it shall be tested as follows: A 12-inch length of PVC coated wire removed from the fabric, including bends and straight sections, but not including twists or knuckles, shall be used as the sample. This sample shall be cold soaked at -20° F (-29° C) for 1 hour. The sample shall be removed from the cold source and within 30 seconds wrapped around a mandrel one complete turn (360°). The mandrel shall have a maximum diameter of 10 times the outside diameter of the wire being tested. The coating on the wire shall exhibit no breaks, cracks, crazing, crumbling or other visual forms of failure after completion of this test (see 3.7.4).
5. PREPARATION FOR DELIVERY (See RR-F-191/GEN)
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Ordering data. Purchasers should select the preferred options permitted herein and include the following information in acquisition documents:
a. Title, number, and date of this specification. b. Size required (see 1.2).
c. Type, mesh, size, wire gage size, and fabric height required (see 1.2, 3.3, 3.9, and
3.12).
d. When the steel wire is other than specified (see 3.2).
e. When weight of zinc or Zn-5Al-MM coating is other than specified (see 3.4). f. When method of applying the PVC coating is not manufacturers option and
method specified (see 3.7 and 6.4).
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