MIL-PRF-2818D
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.2.
3.2 Material. The thermal insulation blanket material when specified (see 6.2), shall be secured between
metallic supporting members. The insulation material shall contain neither asbestos nor ceramic (refractory)
fiber.
3.3 Physical requirements. The insulation material shall conform to the physical requirements specified
in Table I.
3.3.1 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.
TABLE I. Physical requirements.
Characteristic
Requirement
Test Method
Non-fibrous material (shot content) percent
20
4.5.1
by weight, max.
Alkalinity percent, max.
0.6
4.5.2
Corrosiveness to steel, copper, and aluminum
No corrosion greater
4.5.3
than that observed
with sterile cotton
Binder content, percent, max.
1.5
4.5.4
Density lb/ft3 (without supporting metal facings) 8-12
4.5.5
Thermal conductivity (K)
4.5.6
Max. Btu in/hr. sq. ft. degree
Fahrenheit at a mean temperature of
200°F
0.31
400°F
0.44
600°F
0.60
1.25
4.5.7
Moisture absorption, percent, max.
3.4 Dimensions. The length, width and thickness of the insulation blanket shall be as specified (see 6.2).
The tolerances shall be plus 1/4 inch and minus 1/8 inch for thickness, plus or minus 1/2 inch for length and plus
or minus 1/4 inch for width.
3
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