MIL-DTL-24688A
TABLE III. Density (unlagged) (maximum).
Type and Class
Density (lb/ft³)
Type III
Class 1
0.55
Class 2
0.55
Class 3
1.5
Class 4
1.5
Class 5
3.0
Class 6
3.0
3.6 Facing alignment.
3.6.1 Type II, classes 1, 3, 4, and 5 and type III. If the facing material does not cover the entire surface of the
panel or pipe length, the uncovered portion of the panel or pipe length shall not be longer than inch from any
edge. The facing shall not extend over the edge of the panel or pipe length by more than inch. Facing alignment
shall be determined in accordance with 4.4.4.
3.6.2 Type II, class 2. Misalignment of the facing material over the slotted panel shall be not greater than
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3.7 Painting. Type I panels shall be furnished unpainted. Unless otherwise specified (see 6.2), Type II shall be
furnished unpainted. Painting when required shall conform to MIL-DTL-24607 with color as specified (see 6.2).
3.7.1 Paintability (type II, classes 1, 3, 4, and 5 and type III, classes 2, 4, and 6). The faced panel or prelagged
preformed pipe insulation, as furnished, shall be compatible with and shall hold one coat of paint conforming to
MIL-DTL-24607 when applied to the facing. The paint shall dry to a uniform smooth coat which shall have a flat to
semigloss appearance and exhibit no shiners or flashes when viewed under ordinary conditions of illumination.
Paintability determination shall be in accordance with 4.4.5.
3.8 Cutability (type II). When the panel is cut or sawed, the threads of the cloth facing across which the cut is
made shall not be separated from the face over a distance of more than inch. Determination shall be in
accordance with 4.4.6.
3.9 Mass loss by tumbling (type I and type III). The mass loss after tumbling shall be not greater than
3 percent after the first 10 minutes and 5 percent after the second 10 minutes. Determination shall be in accordance
with 4.4.7.
3.10 Corrosiveness (type I and type III). The material shall show no corrosion greater than that observed with
sterile cotton. Determination shall be in accordance with 4.4.8.
3.11 Wicking (type I and type III). The wicking of the material shall not exceed ½ inch above the water line
when tested in accordance with 4.4.9. In addition, precipitates shall not form in the water bearing the wicking
specimens.
3.12 Puncture resistance (type II, class 1 only). The puncture resistance of the faced board shall be not less
than 800 ounce-inches per inch of tear when tested in accordance with 4.4.10.
3.13 Compressibility.
3.13.1 Type I, type II, and type III, classes 1 and 2. Compressibility of Type I (unfaced) panel and Type III,
Class 1 (unlagged preformed pipe) shall be a minimum value of 1.2 pounds per square inch (lb/in²) at 50 percent
deflection when tested in accordance with 4.4.11.1. Compressibility of Type II (faced) panel and Type III, Class 2
(prelagged) preformed pipe shall be performed on the unfaced foam backing only with a minimum value of
1.2 lb/in² at 50 percent deflection when tested in accordance with 4.4.11.1.
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