MIL-T-68410
4.2 Classification of inspections. The inspection requirements specified herein are classified as quality conformance inspections (see 4.3).
4.3 Quality conformance inspection. Samples shall be labeled completely with information identifying the purpose of the sample, name of product, specification number, lot number, date of sampling and contract number.
4.3.1 Inspection
4.3.1.1 Inspection lot. A lot shall consist of all material manufactured in the same identifiable production period, by the same process under the same operating conditions, and submitted for acceptance by one supplier at one time.
4.3.1.2 Samples for quality conformance tests. The sample unit for each lot shall consists of 10 linear feet of tape, or 1 sheet. Two inch wide specimens shall be supplied for the water vapor transmission rate test. The inspection level for determining the sample size shall be S-1 of MIL-STD-105, except that not less than three sample units shall be randomly selected throughout the lot. The index level shall be 4.0 expressed in defects per 100 units. The lots size, for purpose of testing, shall be expressed in units of rolls or cut sheets, as applicable,of the specified width, length, and thickness.
4.3.2 Examination of component materials. In addition to conformance with quality assurance provision of any subsidiary specification, component material shall be examined as specified in table V. In addition, the supplier shall furnish a certificate stating that the cork content and adhesive conform to the requirements of
3.1.1 and 3.1.3, respectively. There shall be no evidence of failure to meet the requirements as applicable.
TABLE V. Examination of component materials.
|
Component and characteristic |
Reference requirement |
Requirements applicable to individual unit |
Number determinations per sample unit |
Results reported as- |
Sample unit |
Sample size |
|
Pass or fail 1 |
Numerically to nearest 2 |
||||||
Cork 20-mesh sieve 40-mesh sieve Backing Weight/sq yd Wrap Filling |
3.1.1 3.1.1 3.1.2 3.1.2 3.1.2 |
x x x |
Average of 2 on composite. Average of 2 on composite. Average of 2 Average of 5 Average of 5 |
x x x |
(composite) 0.1 percent 0.1 percent 0.1 oz/sq yd |
1 lb 2 ft |
3 |
1 If failure is indicted, report description of failure.
2 Test reports shall include all values on which results are based.
4.3.3 Examination of the end item. The tape and sheet shall be visually examined to determine conformance with the requirements of this specification with respect to appearance, workmanship, construction, and dimension. The lot size shall be expressed in units of rolls or sheets. Defects found during this examination shall be scored in accordance with 4.3.3.1 through 4.3.3.4.
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