Downloaded from https://www.everyspec.com ,. . . . . MIL-STD-2031(SH) il. Chemical composition of constituents h. Geometric relationships bctwec=mconstituent materi~ls in a composite l:lyer (i.e., fiber volume [raction, ply construction, etc. ) c. Stacking scqucncc for layers within the bulk structure d. Supplemental adhesives, additives or coatings applied for enhancing fire resistance, abrasion resist ante, dccorat ive purposes, etc. 3.7 Certification. Certification is the determination made by Naval Sea Systems Command as to the acceptability for use of the composite material system for the intended application. 3.8 Flame spread index.
The flame spread index is a number or classification indicating a comparative measure derived from obsewat ions made during the progress of the boundary of a zone of flame under defined test conditions. 3.9 Heat release rote. The heat release rate is the heat evolved from a material, expressed per unit of exposed area, per unit of time. 3.10 seconds, Ignitability. Ignitability is the ease of ignition, as measured by the time to ignite in at a specified heating flux with a pilot flame. igdticm. Ignition is the initiation of cornbusticm m evidtmee by gtow, flanrq detotittdort or explosion. ‘l%e combustion may be sustained or trfinsient. ., ,. ,..
3.11’ 3.12 Large scale open environment fire test. A large scale open environment fire test is a method to test materials at full size of their intended application under controlled fire exposure to determine fire tolerance or ease of extinguishment. 3.13 large scale pressurizable fin test. A large scale pressurizable fire test is a method to test materials using an enclosed compartment in a simulated environment under a controlled fire exposure. 3.14 Oxygen Index oxygen index is the minimum concentration of oxygen in a flowing oxygen nitrogen mixture capable of supporting flaming combustion of a material. 3.15 Oxygen-tempemture index profile.
A oxygen-temperature index profile is a plot of data points that define the temperature dependence of the oxygen index as the thermal environment of a material is changed, 3.16 Quidifieation. The qualification is the process of determining the acceptability of a composite material for use aboard a Naval submarine, 3