MIL-DTL-24688 Insulation, Thermal And Acoustic Absorptive, Cellular Polyimide FoamThis specification covers thermal and acoustic absorptive cellular polyimide foam insulation for use on bulkheads, overheads, and ventilation ducting. This specification also covers preformed thermal pipe insulation for use on piping operating at temperatures up to 600 degrees F in shipboard applications \(see 6.1\).

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MIL-DTL-24688A

APPENDIX B

B.4 IGNITION SOURCE

B.4.1 Ignition source. The ignition source shall be a gas fired burner, as shown on figure B-4, with fuel bed

surface dimensions of 23 inches by 34 inches by 12 inches high. The burner shall use C.P. Grade propane as the

fuel. The gas piping will be installed inside the burner box and the box then filled with materials to allow for the

diffusion of the gas. The burner shall be positioned on the floor of the test compartment such that the 23-inch

dimension is 12 inches from the back wall and the 34-inch dimension is 16 inches from the left wall as shown on

figure B-5. The spacings shall be measured from the interior surface of the wall to the edge of the fuel bed of the

burner. The heat release rates for the burner shall be as shown below:

Test Time (Minutes)

Heat Release Rate (kW)

0�5

100

5 � 10

150

10 � 20

200

FIGURE B-4. Ignition burner.