MIL-PRF-3135H
3.5.5 Indentation.
3.5.5.1 Initial Indentation. The percent initial indentation of the deck covering underlay material shall be as
follows:
Type I
Type II
Type III
Type IV
Class 1
Class 2
Class 1
Class 2
All Classes
All Classes
Min
Max
Min
Max
Min
Max
Min
Max
Max (%)
Max (%)
(%)
(%)
(%)
(%)
(%)
(%)
(%)
(%)
Material cured
---
40
---
10
---
40
---
10
10
25
48 hours
Material cured
1
40
---
10
1
5
---
5
5
7.5
96 hours
3.5.5.2 Residual indentation. The residual indentation of all materials shall not be greater than the following
maximum percentages:
Type I
Type II
Type III
Type IV
Max (Percent)
Max (Percent)
Max (Percent)
Max (Percent)
Material cured 96 hours
38
5
1
1
3.5.6 Resistance to elevated temperatures. The deck covering underlay materials shall not soften detectably by
touch, nor have a measured slip greater than 0.7936 millimeter (0.03125 inch).
3.5.7 Resistance to moisture and temperature changes. The deck covering underlay materials shall show no
signs of cracking, separation from the steel plate, or corrosion of the steel beneath the underlayment.
3.5.8 Moisture absorption.
3.5.8.1 Type I, Class 1. Type I, Class 1 materials shall not absorb greater than 5 percent of moisture based on
its weight at normal atmospheric conditions.
3.5.8.2 Type I, Class 2. Type I, Class 2 materials shall not absorb greater than 2 percent of moisture based on
its weight at normal atmospheric conditions.
3.5.8.3 Types II and III. Type II and III materials shall not absorb greater than 1 percent of moisture, based on
its weight at normal atmospheric conditions.
3.5.8.4 Type IV. Type IV materials shall not absorb greater than 0.1 percent of moisture, based on its weight at
normal atmospheric conditions.
3.5.9 Resistance to chemicals (Types II and III). When tested as specified in 4.5.9, the deck covering underlay
material shall not exceed the following changes in weight and volume:
Weight change
Volume change
Chemical
(Percent maximum)
(Percent maximum)
Oil
6.5
2
JP-5
6.5
2
AFFF (50% solution)
4
2
10% Sulfuric Acid
4
2
3.5.10 Resistance to corrosion. The deck covering underlay material shall not soften or become detached, and
the surface of the steel beneath the deck covering underlay material shall show no signs of corrosion, capillary
action (wicking), or other water penetration under the underlay.
3.5.11 Fire performance. Deck covering underlay shall meet the fire resistance requirements specified in MIL-
STD-1623 for underlay.
7
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