MIL-DTL-24688A
3.16 Upper temperature limit (type I, type II, and type III). The upper temperature limit for Type I, Type II,
and Type III, Classes 1 and 2 shall be 400 °F and the upper temperature limit for Type III, Classes 3, 4, 5, and 6
shall be 600 °F when tested in accordance with 4.4.14. The material shall not flame, glow, smolder, smoke, soften,
collapse, melt, or drip during hot surface exposure.
3.17 Fire resistance. Unless otherwise specified (see 6.2), fire tests shall be performed in accordance with
3.17.1 Testing and examination. For fire testing, an independent testing laboratory that is accredited to
ISO/IEC 17025 or equivalent procedure, and certified by an American Bureau of Shipping (ABS) surveyor or
NAVSEA, shall conduct all fire tests specified in this document. Accreditation to ISO/IEC 17025 shall be obtained
from a recognized accreditation body, such as American Association for Laboratory Accreditation (www.a21a.org)
or International Code Council's International Accreditation Services (www.iasonline.org). The scope of
accreditation shall include fire tests required for qualification. The independent test laboratory shall write a test
report for all tests conducted for qualification purposes. NAVSEA reserves the right to witness the tests, and/or
perform any of the fire tests set forth herein where such testing is deemed necessary to assure compliance to
prescribed requirements of the qualification tests.
3.17.2 Type I and type II.
3.17.2.1 Flame resistance. Type I and Type II, Classes 1, 2, and 5 shall meet the following full scale room test
performance requirements when tested in accordance with 4.4.15.1.1:
a.
Net peak heat release rate over any 30 second period less than 500 kilowatts (kW).
b.
Net average heat release rate for test less than 100 kW.
c. Flame spread must not reach 1.6 feet (0.5 meter) above the floor excluding the area 4 feet (1.2 meters) from
the corner with the ignition source.
d. No flaming droplets or flaming material at any location, which fall from the test specimen during the fire
test, shall continue flaming after reaching the test platform or floor.
e. Peak smoke production rate less than 89.4 square feet per second (ft²/s) (8.3 square meters per second
[m²/s]) over any 60 second period of test.
f.
Test average smoke production rate less than 15.1 ft²/s (1.4 m²/s).
3.17.2.2 Duct insulation room/corner test. Type II, Classes 3 and 4, shall meet the following full scale room
test performance requirements when tested in accordance with 4.4.15.1.2:
a.
Flame spread shall be not greater than 1 foot of flame spread on horizontal duct runs.
b.
No melting or dripping shall be evident.
c.
No ignition of the target array on the floor of the test chamber caused by burning insulation shall occur.
Maximum heat release rate for duct insulation shall be 11,384 Btu/min (200 kW) not including the heat release rate
of the initiating fuel source (e.g., gas burner).
3.17.2.3 Flame spread and smoke (type I). Flame spread shall be not greater than 10 and smoke developed
shall be not greater than 15 when tested in accordance with 4.4.15.2.
3.17.2.4 Flame spread and smoke (type II, all classes). Flame spread shall be not greater than 25 and smoke
developed shall be not greater than 50 when tested in accordance with 4.4.15.2.
3.17.3 Type III.
3.17.3.1 Flame spread and smoke (type III, classes 1, 3, and 5). Flame spread shall be not greater than 10 and
smoke developed shall be not greater than 15 when tested in accordance with 4.4.15.2.
3.17.3.2 Flame spread and smoke (type III, classes 2, 4, and 6). Flame spread shall be not greater than 25 and
smoke developed shall not be greater than 50 when tested in accordance with 4.4.15.2.
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