A-A-52404 Insulation Sheet, Cellular, Plastic: Thermal (Metric)This commercial item description (CID) covers a unicellular, elastomeric, expanded plastic thermal insulating material whose intended use is to insulate metallic personnel compartment panels of military vehicles, as a thermal barrier for temperatures ranging from 74 deg. C to minus 54 deg. C.

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A-A-52404

2.3 Performance.

2.3.1 Compression set. The resilience capability of the insulation material shall be 35 to 50 percent (%) when tested in accordance with method B of ASTM D395.

2.3.2 Volume change on heat aging. The volume change on heat aging insulation material shall be not more than 8% when tested in accordance with method 7221 of FSD-STD-601.

2.3.3 “K” Factor. The heat transfer, coefficient of insulation material shall be no more than 0.043 watt per meter Kelvin [W/ (mK)] at 74°C and minus 54°C.

2.3.4 Density. The density of insulation material shall be not more than 120.138 kilogram per cubic meter (kg/m3).

2.3.5 Tensile strength. The tensile strength of the insulation material shall be not less than 344.737 kilopascal (kPa) when tested in accordance with ASTM D412 or ASTM D3574.

2.3.6 Elongation. The elongation of the insulation material shall be not less than 200%. The elongation shall be measured and recorded during tensile strength testing (see 2. 4.5).

2.3.7 Water absorption. The water absorption of the insulation Material shall be not more than 4% by weight when tested in accordance with method 12411 of FED-STD-601.

2.3.8 Flame resistance. The insulation shall be self-extinguishing. This shall be verified by applying a candle flame to the lower or free end of a clamped specimen for 15 seconds. The candle shall then be removed. If the flame ceases within 5 seconds, the insulation material shall be considered self-extinguishing.

2.3.9 Brittleness. The insulation material shall withstand a 180 degree bend over an 8 mm diameter rod in 15 seconds at a temperature of minus 54 ± 3°C without cracking.

2.3.10 Dimensional change. The change in the linear or transverse dimensions shall be not more than 1. 5%.

2.3.11 Coherency with adhesive cemented joint. The tensile strength of the cemented joint shall not be less than 344.737 kPa.

2.4 Identification and marking. Identification and marking shall be permanent and legible in accordance with MIL-STD-130 and shall include the manufacturer’s identification, and the part identification number (PIN).

2.5 Workmanship. Workmanship shall be in accordance with the manufacture of high quality insulation sheets. This shall be evidenced by the absence of any defects which are detrimental to their appearance or serviceability. Insulation sheet shall be free from large voids, foreign inclusions, contaminations, seams, and from any material that accelerates aging and deterioration.