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MIL-PRF-87260 Foam Material, Explosion Suppression, Inherently Electrostatically Conductive, For Aircraft Fuel TanksThis document covers the requirements for an electrically conductive open-celled foam material that will be used for explosion suppression in aircraft fuel.

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MIL-PRF-87260B(USAF)

CONTENTS

PARAGRAPH

PAGE

Qualification testing. .................................................................................................... 11

4.3.1

Test sample(s). ............................................................................................................ 11

4.3.1.1

Test specimens............................................................................................................ 12

4.3.1.1.1

Test section location. ................................................................................................... 12

4.3.1.1.2

Quantity of specimens. ................................................................................................ 12

4.3.2

Test report, disposition of test specimens, and data for the qualifying activity. .......... 12

4.3.3

Qualification approval. ................................................................................................. 13

4.3.4

Qualification tests. ....................................................................................................... 13

4.4

Conformance inspections. ........................................................................................... 13

4.4.1

Production tests. .......................................................................................................... 13

4.4.2

Lot tests. ...................................................................................................................... 14

4.4.2.1

Rejection and retest..................................................................................................... 14

4.4.3

Process control tests. .................................................................................................. 14

4.4.3.1

Rejection and test. ....................................................................................................... 15

4.5

Test methods. .............................................................................................................. 15

4.5.1

Examination of product. ............................................................................................... 15

4.5.2

Color test...................................................................................................................... 15

4.5.3

Density test. ................................................................................................................. 15

4.5.3.1

Density uniformity. ....................................................................................................... 15

4.5.4

Porosity (air pressure drop) test. ................................................................................. 15

4.5.5

Tensile strength and ultimate elongation tests. ........................................................... 18

4.5.6

Tear resistance test. .................................................................................................... 18

4.5.7

Constant deflection compression set test.................................................................... 18

4.5.8

Compression load deflection (CLD) test...................................................................... 18

4.5.9

Fuel displacement test................................................................................................. 19

4.5.9.1

Theoretical fuel displacement. ..................................................................................... 19

4.5.10

Fuel and water retention test. ...................................................................................... 19

4.5.10.1

Fuel retention tests. ..................................................................................................... 19

4.5.10.2

Water retention test. .................................................................................................... 20

4.5.10.3

Test data and sample requirements. ........................................................................... 20

4.5.11

Extractable material test. ............................................................................................. 21

4.5.12

Volume swell test. ........................................................................................................ 21

4.5.13

Low temperature flexibility test. ................................................................................... 21

4.5.14

Entrained solid contamination tests............................................................................. 22

4.5.15

Steam autoclave exposure test. .................................................................................. 22

4.5.16

Fluid immersion tests................................................................................................... 22

4.5.16.1

Tension tests................................................................................................................ 22

4.5.16.2

Electrical resistivity test................................................................................................ 23

4.5.16.3

Immersion tests. .......................................................................................................... 23

4.5.17

Hydrolytic stability tests. .............................................................................................. 23

4.5.17.1

Humidity exposure. ...................................................................................................... 23

4.5.17.1.1

Tension tests................................................................................................................ 23

4.5.17.2

Water immersion.......................................................................................................... 24

4.5.17.2.1

Testing frequency. ....................................................................................................... 24

4.5.17.3

Dry heat. ...................................................................................................................... 24

4.5.17.3.1

Testing frequency. ....................................................................................................... 24

4.5.17.4

Data requirements. ...................................................................................................... 24

4.5.18

Explosion suppression and flame arrestor characteristics. ......................................... 24

4.5.18.1

Material sizing. ............................................................................................................. 25