MIL-PRF-24172B (SH)
6.1 Intended use. The material cove red by this specification is intended primarily for insulation of refrigerator
spaces. The materials traditionally used to meet the requirements of this specification were organic polyisocyanate and
polyol resin containing a blowing agent.
6.2 Acquisition requirements. Acquisition documents should specify the following:
(a) Title, number, and date of this specification.
(b) Type and class material required (see 1.2).
(c) Color, if different (see 3.3).
(d) Dimensions for type I material (see 3.6).
(e) Ambient cure temperature conditions (see 3.7.1).
(f) Atmospheric conditions, if different (see 4.5.1).
(g) Sample test mold required (see 4.5.2 through 4.5.2.1.3).
(h) Handling characteristics required for type II only (see 4.5.2.2 and 6.3).
(j) Packaging requirements (see 5.1).
(k) Is Material Safety Data Sheet required? (see 6.4).
(l) Is off-gas testing required? (see 3.10 and 6.7).
(m) If first article inspection is required (see 3.1).
6.3 Handling characteristics for type II material. For any specific application that may be necessary to specify the
following characteristics:
(a)
The temperature range required for mixing and foaming the basic ingredients.
(b)
Temperature range for air and mold prior to foaming.
(c)
Mixing time.
(d)
Flow time.
(e)
Rise time.
(f)
Permissible time lapse between pourings, if multiple pours are needed to fill the cavity.
6.4 Material safety data sheets. Contracting officers will identify those activities requiring copies of
completed Material Safety Data Sheets prepared in accordance with FED-STD-313. In order to obtain the MSDS,
FAR clause 52.223-3 must be in the contract.
6.5 Subject term (key word) listing.
Foam material
Insulation
Plastic
Polyisocyanate
6.6 Toxicity evaluation. The NAVENVIRHLTHCEN requires sufficient information to permit a HHA of
the product. Any questions concerning toxicity and requests for HHA should be addressed to the Commanding
Officer, Navy Environmental Health Center, ATTN: Hazardous Materials Department, Industrial Hygiene
Directorate, 620 John Paul Jones Circle, Suite 1100, Portsmouth, VA 20378-2103. Upon receipt of the HHA, a
copy should be provided to Commander, Naval Sea Systems Command, ATTN: SEA 05Z9, 1333 Isaac Hull Ave.,
SE, Stop 5133, Washington Navy Yard, DC 20376-5160.
6.7 Off-gassing. Materials to be installed in submarines are to be controlled to prevent off-gassing,
which contaminates the atmosphere and results in health hazards to personnel or deleterious effects on machinery.
These controls are accomplished through the Submarine Material Control Program, which is described in the
Nuclear Powered Submarine Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev
2. Under the Submarine Material Control Program, all materials considered for use on submarines require
certification and assignment of a usage category. Under the certification process, candidate materials are selected
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