MIL-PRF-20092M
(b) Changes in volume during cure, resulting in surface depressions or minor changes in size, shall be
corrected by addition of material of identical composition and buffed to a level surface.
(c) Laminae products shall be scrim-reinforced provided such scrim reinforcing does not add to
flammability or smoke emission of the material. Also, scrim reinforcing will be permitted as long
as the surfaces of the mattress are not wrinkled. Scrim reinforcing is defined as woven cloth fabric
bonded to the cellular surfaces to add to the tensile strength of the assembly.
(d) Where laminae assembly is employed to achieve thickness, the laminae shall be as thick as possible
but in no case less than 1/2-inch.
(e) Seams that are cemented shall not cause distortion of the base material in an uncompressed state or
when compressed to 75 percent of the original height. Cemented seams shall exhibit strength
greater than the base material.
(f) For cushions, a maximum of two sections may be butted together to achieve width or length. Sections
are defined as pieces of full thickness which are the full width or length of the item. Lamination
may be used to achieve thickness.
3.4 Odor. The material shall be properly cured in order to prevent any objectionable odor. (An
objectionable odor shall be defined as one that is atypical of cellular rubber compound.) The material shall
conform to the requirements of paragraph 5.6 of ASTM C 739.
3.5 Dimensions and tolerances. Dimensions of all sheets, molded or assembled shapes shall be as
specified (see 6.2), and within the tolerances or dimensions of latex foam rubber products for general applications
in accordance with ASTM D 1055.
3.6 Physical properties.
3.6.1 Indentation. The indentation of each class and condition of uncored material shall be as specified in
Table I or II.
TABLE I. Indentation and apparent density of mattress insert material (Type II mattress inserts only).
Class
Condition
Indentation, pounds required to
Apparent density, pounds per
compress 50 square inches (in2)
cubic foot (lb/ft3) (maximum)
of a 43-inch specimen 25 percent
based on gross volume
Class 5
Medium
25 to 42
8.0
Medium firm
30 to 55
9.0
Firm
42 to 60
9.2
3.6.2 Density.
3.6.2.1 Type II. The maximum apparent density of each class and condition of uncored material shall be
as specified in Table I or II.
TABLE II. Indentation and density of cushioning material (Type II nonmattress inserts).
Class
Condition
Indentation, pounds required to
Apparent density,
Compression resistance
compress 50 in2 of a 43-inch
(lb/ft3) (maximum)
Oscillograph lb/in2 to
specimen 25 percent - test
based on gross volume
compress to 25 percent
method ASTM D 3574
Class 5
Soft
10 to 25
7.5
0.20 to 0.50
Medium
25 to 42
8.0
over 0.50 to 0.84
Medium firm
30 to 55
9.0
0.60 to 1.10
Firm
42 to 60
9.2
over 0.84 to 1.70
4
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