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MIL-D-60572B
3.3 Materials. All materials used in the manufacture of the cartridges shall conform strictly to the
specifications referred to on the respective drawings unless specific approval in writing covering a departure
therefrom has been obtained from the cognizant Navy design activity prior to manufacture. When alternate
materials or methods of manufacture are specified on the drawings, the bidder's selections shall be clearly
stated in the proposal.
3.4 Components.
3.4.1 Primary components. For the purpose of this specification, the PVU-1/A Ignition Device, Delay
Charge, and output material charge are considered primary components. Only primary components from a
single lot shall be used in a production lot of cartridges; however, one primary component production lot may
be used in more than one cartridge production lot (see 6.7).
3.4.1.1 Ignition device. The ignition device shall conform to the applicable drawing and reference
specification. Only ignition devices from lots manufactured within the last 24 months or recertified within the
last 12 months shall be used in these units. Prior to assembly into a delay element, the ignition device shall
be visually examined in accordance with 4.6.5 and radiographically examined for defects as specified in 4.7.1.
3.4.2 Protective finish. The finish of each component part shall be in accordance with MIL-A-8625 and the
applicable drawing (see 4.7.2).
3.5 Assembly.
3.5.1 Radiographic examination. Each delay element assembly shall be radiographically examined for
defects (see 4.7.3).
3.5.2 Vibration. The assembled delay element shall withstand vibration as prescribed in MIL-STD-810,
Method 514.3, Test Procedure I, Test Condition I-3.2.5 without evidence of any disintegration of the ignition
device, propellant, or igniter, or derangement of any component (see 4.7.4 and 6.2).
3.6 Functional requirements.
3.6.1 Delay element performance.
3.6.1.1 Misfires. The ignition delay element shall not fail to fire.
3.6.1.2 Ballistics. The ignition delay charge shall consist of barium chromate, as specified in MIL-B-550, and
boron, as specified in MIL-B-51092, in the proportion and quantity fixed by the contractor to produce the
ignition delay times required in table I (see 6.6.1).
3

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