INCH-POUND
MIL-DTL-24688A
06 December 2011
SUPERSEDING
DOD-I-24688
18 August 1987
DETAIL SPECIFICATION
INSULATION, THERMAL AND ACOUSTIC ABSORPTIVE,
CELLULAR POLYIMIDE FOAM
This specification is approved for use by all Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This 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 °F in shipboard applications (see 6.1).
1.2 Classification. Flexible and rigid polyimide foam is to be furnished in the following types and classes as
specified (see 6.2).
Type I
-
Unfaced (thermal and acoustic absorptive) panel
Type II
-
Faced panel
Class 1
- Fibrous glass cloth faced (thermal)
Class 2
- Slotted base board faced with perforated fibrous glass cloth (acoustical)
- Faced with primer coated aluminized polyester/aluminum foil reinforced with a fibrous
Class 3
glass scrim
- Faced with primer coated aluminized polyester/aluminum foil reinforced with a fibrous
Class 4
glass scrim laminated to a lightweight fibrous glass cloth
Class 5
- Faced with primer coated white polyester film reinforced with a fibrous glass scrim
Type III
-
Preformed pipe insulation (thermal)
- 0.55 pounds per cubic foot (lb/ft³) (maximum) flexible foam unlagged (400 °F upper
Class 1
temperature limit)
- 0.55 lb/ft³ (maximum) flexible foam prelagged with fibrous glass cloth (400 °F upper
Class 2
temperature limit)
Class 3
- 1.5 lb/ft³ (maximum) rigid foam unlagged (600 °F upper temperature limit)
- 1.5 lb/ft³ (maximum) rigid foam prelagged with fibrous glass cloth (600 °F upper
Class 4
temperature limit)
Class 5
- 3 lb/ft³ (maximum) rigid foam unlagged (600 °F upper temperature limit)
- 3 lb/ft³ (maximum) rigid foam prelagged with fibrous glass cloth (600 °F upper temperature
Class 6
limit)
Comments, suggestions, or questions on this document should be addressed to Commander, Naval Sea Systems
Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or
emailed to CommandStandards@navy.mil, with the subject line "Document Comment". Since contact information
can change, you may want to verify the currency of this address information using the ASSIST Online database at
https://assist.daps.dla.mil.
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