A-A-54309
Examination. Bandages shall be examined to verify that construction and workmanship are in accordance with applicable requirements.
Tests. Tests shall be conducted to determine compliance with specification requirements.
Dimensions. Length and width of bandages shall be measured.
Standard testing conditions. All testing specified below shall be conducted in a controlled environment with the temperature at 75°F ± 3°F and a relative humidity at 55% ± 5% on bandages wrapped and ready for shipment by removing envelope and testing as specified. Equipment and material shall be conditioned at this temperature and humidity at least ten hours prior to testing.
Cast strength. The test is used to determine the strength of a 2-3/4 inch inside diameter test cylinder when compressed diametrically at a specified test time. Test times are designated at 15 minutes; 1 hour; and 24 hours after activation of the bandage by immersion in water. Samples are removed from the forming dowl at 10 minutes and stored in an open area at ambient conditions until test time.
While wearing protective gloves of vinyl or latex, the tester shall remove the bandage from the pouch just prior to wrapping and dip it into clean, fresh water at 75°F ± 1°. The bandage is squeezed 4 to 5 times to complete water penetration, remove and shaken, then wrapped onto the solid metal forming dowl which has been covered with 1 layer or waxed paper. The complete bandage, approximately 16 layers, is rolled onto the dowl so that the long length edges lay on top of each other. The cylinder is compressed by hand to assure good lamination between layers.
Ten minutes after immersion, the samples are removed from the dowl and stored. At the specified test times the sample cylinders are compressed in an Instron Model 1122 or a Chattelon Tester Model USTM.
The cylinders are placed between the platens of the test apparatus so that the lengthwise direction of the cylinder aligns with the lengthwise direction of both platens and does not exceed the length of the platens of either side. The gap between the platens is closed so that both are in contact with the cylinder but no load is applied. Compression is then begun at a rate of 12 inches per minute for a distance of 1 cm at which point the strength of the cylinder is recorded. This load is recorded in pounds and 4 tests results are recorded per lot for each specified time.
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