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MIL-C-18312 Capacitors, Fixed, Metallized \(Paper-Plastic, Or Plastic Film\) Dielectric, Direct Current \(Hermetically Sealed In Metal Cases\), General Specification ForThis specification covers the general requirements for fixed capacitors with metallized \(paper, paper-plastic or plastic film\) dielectric, direct current, hermetically sealed in metal cases. These capacitors should only be used in circuitry in which high values of insulation resistance are not essential, and in which occasional momentary breakdowns can be tolerated.

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MIL-C-18312G

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.

Except as specified in 4.6.2.3, delivery of products that have passed the group A inspection shall not be delayed

pending results of the group B inspection.

4.6.1.1 Inspection lot. An inspection lot shall consist of all capacitors of the same group and of the same

characteristic (see 1.2.1.4), produced under essentially the same conditions and offered for inspection at one time.

The sample selected from the lot shall be representative of the styles in the lot. All styles and voltage ratings may be

combined by characteristic as indicated in table VI.

TABLE VI. Inspection lot groups.

Group

Characteristic symbol

4.6.1.2 Group A inspection. Group A inspection shall consist of the examinations and tests specified in

table VII in the order shown.

4.6.1.2.1 Sampling plan. The sampling plan shall be as specified in table VII. In the event of one or more failures,

the lot shall be rejected.

4.6.1.2.2 Rejected lots. If an inspection lot is rejected, the supplier may rework it to correct the defects, or screen

out the defective units, and resubmit for reinspection. Reinspected lots shall be kept separate from new lots, and

shall be clearly identified as reinspected lots.

TABLE VII. Group A inspection.

Examination or test

Requirement

Method

Sampling

paragraph

procedure

Subgroup 1

Seal

3.5

4.7.2

Dielectric withstanding voltage

3.6

4.7.3

Insulation resistance at +25�C

3.9

4.7.6

See table VIII

0 failures

Capacitance

Dissipation factor

Subgroup 2

Visual and mechanical examination

13 samples

Physical dimensions

Marking 1/

0 failures

Workmanship

3.23

4.7.1

Subgroup 3

Insulation resistance (at high ambient)

3.9

4.7.6

See table IX

Life

3.19

4.7.16.2

0 failures

1/ Marking defects are based on visual examination and will be charged only for illegible,

incomplete, or incorrect marking. Any subsequent electrical defects shall not be used as a

basis for determining marking defects.