Quantcast Table 38. Steel-Ply Retrofit Installations for the High-Severity Level Attack

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MIL-HDBK-1013/1A
Table 38
Steel-Ply Retrofit Installations for the High-Severity Level Attack
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*
* Additional  *
*
* Delay Time  *
Type of Construction
*
*  (minutes)  *
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*Three layers [10-gauge (3.4-mm) ASTM A569 steel - 3/4-inch
*
*
*(19-mm) plywood - 10-gauge (3.4-mm) ASTM A569 steel]
*
*
6
*
*
*
*Five layers [10-gauge (3.4-mm) ASTM A569 steel - 3/4-inch
*
*
11
*(19-mm) plywood - 10-gauge (3.4-mm) ASTM A569 steel - 3/4-
*
*
*
*
*inch (19-mm) plywood - 10-gauge (3.4-mm) ASTM A569 steel]
*
*
*
*Three layers [9-gauge (3.8-mm) ASTM A607 steel - 3/4-inch
*
14 (a) *
*(19-mm) plywood - 9-gauge (3.8-mm) ASTM A607 steel]
*
*
*
*
*
*Five layers [9-gauge (3.8-mm) ASTM A607 steel - 3/4-inch (19-*  Not Tested *
*mm) plywood - 9-gauge (3.8-mm) ASTM A607 steel - 3/4-inch
*
*
*(19-mm) plywood - 9-gauge (3.8-mm) ASTM A607 steel]
*
*
*
*
*
*Three layers [1/4-inch (6.25-mm) type 304 stainless steel -  *
*
10
*1/2-inch (12.5-mm) polycarbonate - 10-gauge (3.4-mm) ASTM
*
*
*A607 steel]
*
*
*
*
*
17
*Five layers [10-gauge (3.4-mm) ASTM A607 steel - 1/2-inch
*
*
*(12.5-mm) polycarbonate - 10-gauge (3.4-mm) ASTM A607 steel -*
*
*1/2-inch (12.5-mm) polycarbonate - 10-gauge (3.4-mm) ASTM
*
*
*A607 steel] (b)
*
*
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(a) Twenty minutes with two layers of 90-pound (41-kg) gravel finish
roofing paper.
(b) Recommended for ballistic protection. Source: MIL-HDBK-1013/5
The steel-ply options, including installation techniques, are described in
MIL-HDBK-1013/5.  Layered sheet steel and wood combinations can double or
triple penetration times (see Table 38). The test data indicate that a layer
of 3/4-inch (19-mm) plywood sandwiched between two layers of 10-gauge
(3.4-mm) hot-rolled steel provides about 6 minutes of penetration time (Table
38).  The penetration time can be increased by about 5 minutes with the
addition of another wood/steel layer (Table 38).  This rule of thumb can be
applied to the addition of more layers until the overall thickness of the
wall renders the use of hand and power tools impractical.  Better gains in
penetration time can be achieved by changing the steel layers to 9-gauge
(3.8-mm) ASTM A607 HS low alloy steel.
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