MIL-PRF-2818D
3.5 Supporting members. The supporting members shall consist of stainless steel wire mesh on both
sides of the insulations or wire mesh on one side and metal lath on the other side or without supporting members,
as specified (see 6.2 and 6.9)
3.6 Resistance to vibration. The insulation blanket shall not, after heating/vibration, lose more than 15.0
percent in mass, nor sag an average of more than 3 inches (see 4.5.8). There shall be no detrimental affect to the
overall physical characteristics of the blanket when comparing to a control specimen. For example, bolts cutting
through the insulation material which cause large quantities of fiber or insulation blanket pieces to drop off the
test stand holder during or after the test is unacceptable.
3.7 Fire resistance. The insulation material without supporting members shall meet the requirements of
MIL-STD-1623 (see 4.5.9).
3.8 Maximum exothermic temperature rise. The insulation blanket mid-point temperature shall not
exceed the hot surface temperature by more than 100°F when tested in accordance with ASTM C 411 and the hot
surface performance section of ASTM C 447 at the insulation's maximum use temperature and at the
manufacturer's maximum recommended thickness for that temperature. The 100°F criterion applies during heat-
up as well as steady state conditions (see 4.5.10).
3.9 Toxicity. When evaluated in accordance with 4.5.11, the insulation blanket material shall have no
adverse effect on the health of personnel when used for its intended purpose and shall not cause any environmental
problems during waste disposal (see 4.5.11 and 6.6).
3.10 Off-gassing. The insulation blanket shall meet the requirements in the Nuclear Powered Submarine
Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev 2, for a usage category of
Limited (see 4.5.12 and 6.7).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.1.1 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be performed in
accordance with the test conditions specified herein.
4.2 First article inspection. First article inspection shall consist of the tests specified in Table II (see
6.3). Unless otherwise specified (see 6.2), if more than one thickness of insulation blanket is acquired at any one
time, one blanket of each thickness shall constitute the first article sample.
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