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the sample, transfer weighing dish and sample to a vacuum drying oven, dry at 160° ±5°F and 28 ±2
inches of mercury vacuum until constant weight is obtained. The loss of weight represents the
percentage of moisture in the original sample. Use the same procedure for the primer composition.
4.7.2 Smokeless powder, condition. Smokeless powder shall be inspected in accordance with the
applicable paragraphs of OP 5. Evidence of decomposition shall be cause for rejection.
4.7.3 Insulation resistance. The insulation resistance of each completely assembled ignition element
shall be checked with an applied voltage, of 350 ±10 volts D.C. This measurement shall be made
between shorted electrodes (connector pins) and receptacle. Units which fail to meet the requirements of
3.7 shall be rejected.
4.7.4 X-ray of ignition element. Examine all ignition elements by X-ray and reject those, having any
of the defects of 3.10.4. Ignition elements shall be mounted in suitable racks or frames and laid on their
side so that the most revealing exposure can be obtained. Pressure-sensitive tape may be used as an aid
in positioning the ignition elements.
4.7.5 Bridge circuit resistance. Conformance, with the bridge circuit resistance of 3.10.2 shall be
ascertained by means of a test circuit which limits the bridge current to 25 milliamperes, maximum. The
test circuit shall be connected to the ignition element through a number PTO6E-8-2S Bendix connector,
or equivalent. A new connector shall be used after a maximum of 500 connections. A safety chamber
with an interlock switch shall be used to protect the operator during the application of current. A suitable
bridge which is known to be accurate within 1 percent in the range of resistance specified shall be used to
determine whether or not the requirement is being met. Units which fail to meet the requirements of
3.10.2 or fail to assemble completely, by hand, with the specified connector, with ignition element lugs
locked in connector detents, shall be rejected. The results of bridge circuit resistance measurements shall
not be affected by resistance of the test circuit or connector.
4.7.6 Visual inspection. Examine all ignition elements visually and reject those having any of the
defects of 3.10.1.
4.7.7 Leakage. Each ignition element in the first article sample or production lot sample shall be leak
tested in a dry gas or dry air leak tester. Ignition elements which exhibit a leak rate in excess of 10 -5
cc/sec gas or air at a pressure differential of 1.0 ±0.1 atmosphere shall be considered defective. Ignition
elements of the first article sample which exhibit a leakage defect shall be rejected. If one or more
ignition elements of the production lot sample exhibit a leakage defect, then a 100 percent leak test of the
lot being tested shall be required at no additional expense to the government. Ignition elements which
exhibit a leak rate in excess of that specified above shall be rejected.
4.7.8 Electric sensitivity tests.
4.7.8.1 No-fire test. The number of ignition elements selected from each production lot for the no-fire
test shall be in accordance with the requirements of table I of ANSI/ASQC Z1.4, General Inspection
Level I. Each ignition element shall be conditioned at 70° ±5° F for a minimum of 6 hours and then
tested. During this test insure that the ignition element is sufficiently shielded to prevent personnel
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