MIL-DTL-24487B (SH)
3.2.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the material
meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle
costs.
3.3 Form. The tile shall consist of a rubber sheet having one smooth face and one cross-grooved face.
The tile shall be furnished with the face or faces that will be bonded to metal roughened by abrading so that, except
for solvent cleaning and adhesive application, no further treatment is required. The cross-grooved face of Class 1
tile shall be roughened. Both faces of Class 2 tile shall be roughened. Abrasion of the tile faces shall break the
gloss over at least 95% of the area. The number and size of cross-grooves shall be such that a tile shall easily
conform to a curved surface with no wrinkles, buckling or obvious distortions. Tiles prepared with the dimensions
as shown in 6.4 have in the past allowed the tile to meet the requirements of the specification.
3.4 Dimensions. Unless otherwise specified (see 6.2), tile dimensions shall be as follows: Plan size
11.875 ± 0.0625 inches (30.16 ± 0.16 cm) by 11.875 ± 0.0625 inches (30.16 ± 0.16 cm); thickness Class 1, 0.750 ±
0.015 inch (1.90 ± 0.04 cm) and Class 2, 0.630 ± 0.015 inch (1.60 ± 0.04 cm). If tiles are ordered with plan
dimensions which differ from those provided above, each plan dimension shall conform to the ordered size with a
tolerance of plus or minus (±) 0.0625 inch (0.16 cm).
3.5 Weight. The weight of the Class 1 tile shall be 5.0 ± 0.2 pounds per square foot (lb/ft2) (24.4 ± 1.0
kilograms per square meter (kg/m2)). The weight of the Class 2 tile shall be 4.4 ± 0.2 lb/ft2 (21.5 ± 1.0 kg/m2).
3.6 Flame retardance. Tiles shall be self-extinguishing.
3.7 Vibration damping characteristics. Tiles shall conform to the vibration damping characteristics
specified in Table II or III, as appropriate.
TABLE II. Class 1 tiles, vibration damping characteristics.
Lengthwise
Nominal frequency at 50°F (10°C)
Flexural
of 0.5 x 3 x 26 in. (1.3 x 7.6 x 66 cm)
Percent critical damping (minimum)
mode number
covered bar, Hz
at 50°F (10°C)
5
1800
4.5
7
3700
4.5
9
5750
1.5
TABLE III. Class 2 tiles, vibration damping characteristics.
Lengthwise
Nominal frequency at 50°F (10°C)
Flexural
of 0.625 x 3 x 29 in. (1.6 x 7.6 x 74 cm)
Percent critical damping (minimum)
mode number
covered bar, Hz
at 50°F (10°C)
5
1850
2.0
7
3330
3.0
9
6650
1.0
3.8 Identification. Each tile shall be legibly and permanently marked with the contractor's name or
trademark, the month and year of manufacture, the contract number and the specification number. In addition, two
adjacent edges of each tile shall be marked with one coat of paint or lacquer to identify the class of the tile. The
marking shall be at least 0.250 inch (0.64 cm) wide. The identifying colors shall be as follows:
Class 1 - green
Class 2 - orange
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