MIL-P-47099 Polyurethane Foam, Polyether Type, Rigid, For Packaging And Encapsulation Of Electrical ComponentsThis specification covers the requirements and tests for three types of two-component polyether type polyurethane foam,rigid, for packaging and encapsulation of electronic components.

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MIL-P-47099A

TABLE II. Quality conformance inspection.

Inspection

Requirement paragraph

Test paragraph

Density

Tensile strength Compression strength Shear strength Dielectric constant Dielectric strength Dimensional stability Flammability Temperature resistance Humidity growth Fungus resistance Workmanship

3.4, table I

3.5

4.7.2

4.7.3

4.7.4

4.7.5

4.7.6

4.7.7

4.7.8

4.7.9

4.7.10

4.7.11

4.7.12

4.5.3

4.5.1 Sampling. For sampling purposes, a one pint kit containing all required ingredients shall be considered as a sampling unit. The number of sampling units shall be as specified by the procuring activity (see 6.2).

4.5.2 Lot formation. A lot shall consist of a batch of material manufactured in one continuous operation by the same process, by the same manufacturer, using the same batches of raw materials and submitted for 100 percent inspection at one time.

4.5.3 Examination. The polyether type polyurethane foam shall be examined for compliance with the requirements specified in 3.2 through 3.5.

4.6 Inspection of packaging. Except when commercial packaging is specified, the sampling and inspection of the preservation and interior package marking shall be in accordance with groups A and B quality conformance inspection requirements of MIL-P-116. The sampling and inspection of the packing for shipment and storage

shall be in accordance with the quality assurance provisions of the applicable container specification shown in section 5. The inspection of marking for shipment and storage shall be in accordance with MIL-STD-129. The inspection of commercial packaging shall be as specified in the contract (see 6.2).

4.7 Methods of inspection.

4.7.1 Test specimen preparation. Utilizing the samples selected as specified in

4.5.1, the test specimens shall be prepared as specified in the applicable test method.