MIL-DTL-24688A
3.17.3.3 Pipe insulation room/corner test (type III, all classes). Insulation or insulation system shall be fire
tested in the configuration that it is to be installed aboard ship. When tested in accordance with 4.4.15.2.1, the
insulation or insulation system shall meet the following performance criteria:
a. Flame spread shall be not greater than 1 foot of flame spread on horizontal pipe runs. Additionally, no
melting or dripping shall be evident, and no ignition of the target array on the floor of the test chamber caused by
burning insulation shall occur.
b. The maximum heat release rate shall be 11,384 Btu/min (200 kW) not including that of the initiating fuel
source.
3.18 Toxic gas generation (type I, type II, and type III). The toxic gas generation shall be not greater than
300 parts per million (ppm) for carbon monoxide (CO), not greater than 5 ppm for hydrogen cyanide (HCN),
hydrogen fluoride (HF), hydrogen bromide (HBr), and sulfur dioxide (SO2), and not greater than 10 ppm for
hydrogen chloride (HCL) and mixed nitric oxides (NOX). Determinations shall be made in accordance with 4.4.16.
3.19 Steam aging (hydrolytic stability) (type I and type III, classes 1, 3, and 5). The material shall be exposed
in a steam autoclave. Tensile strength shall not change more than 25 percent. Dimensional and weight changes
shall not be not greater than 10 percent. Determinations shall be made in accordance with 4.4.17.
3.20 Fungus resistance (type I and type III). Insulation or insulation system for Type I and Type III shall show
no signs of fungal growth after 30 days of incubation. Determinations shall be made in accordance with 4.4.18.
3.21 Odor (type I and type III). The material shall produce no offensive odor when tested in accordance with
4.4.19.
3.22 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.
3.23 Toxicity (type I, type II, and type III). When evaluated in accordance with 4.4.20, the cellular polyimide
foam insulation and any of its components 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 4.4.20 and 6.5).
3.24 Off-gassing (type I, type II, and type III). If the material is required to be used on submarines, the material
shall be certified for and assigned a usage category of either "Permitted" or "Limited" in accordance with
S9510-AB-ATM-010 chapter titled "Material Control Program" (see 4.4.21 and 6.6). Formulation changes in the
material shall require a reevaluation of the material (see 4.4.21).
3.25 Identification markings. Unless otherwise specified (see 6.2), each panel on the backside shall be marked
with the information as follows:
a.
"Polyimide Foam"
b.
"Asbestos Free"
c.
Specification number, type, and class
d.
Manufacturer's name
e.
Manufacturer's product identification
Markings shall be legible, permanent, and not less than inch in height. A minimum of two complete markings
shall be required per panel. Inspection shall be in accordance with 4.4.22.
3.26 Workmanship. Material shall be uniform in quality and condition. Material shall be clean and free from
foreign materials, contaminants, and defects that will impair material use and serviceability.
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