MIL-PRF-24699A (SH)
installation pattern. The studs shall be installed such that they are aligned in rows and columns in a rectangular
pattern, 12 inches apart and 6 inches from the seams in the barrier material.
4.4.9 Toxicity. The barrier material shall be evaluated by the Navy Environmental Health Center
(NAVENVIRHLTHCEN) using the administrative Health Hazard Assessment (HHA). A flowchart for this process
can be found as enclosure (1) of BUMEDINST 6270.8. The HHA is a review of the barrier material based on
information submitted by the manufacturer, to assess health hazards associated with the handling, application, use
and removal of the product. Sufficient data to permit a HHA of the product shall be provided by the
manufacturer/distributor to the NAVENVIRHLTHCEN. To obtain current technical information requirements
specified by the NAVENVIRHLTHCEN, see 6.5.
4.4.10 Off-gassing. The barrier material shall be tested in accordance with the Nuclear Powered
Submarine Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev 2, by a
Government approved testing facility. The results shall be submitted to the Government for evaluation and approval
for use (see 3.13 and 6.6).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract
or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel,
these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point's packaging activities within the Military Service or
Defense Agency, or within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Barrier materials furnished under this specification are intended for application to
plane and curved ship structures and machinery surfaces in order to attenuate airborne noise. Type I barrier
material (see 1.2) is primarily used as the top or middle layer of thermal, acoustic, or fire insulation materials
which are attached to the deck, bulkhead, overhead, ducting, or machinery casing surfaces. Standard application
details are contained in Naval Sea Systems Command (NAVSEA) drawings 804-5773931 and 804-5773932. The
type II barrier material (see 1.2) is intended as a middle layer (sandwich) component of composite treatments, and
uses an insulation material for the lower layer and a faced panel or metal sheathing as the upper layer. Type II
barrier material is used when Coast Guard approval is required. Type I and type II barrier materials are specified in
sizes that are convenient and economical for shipboard installation. The barrier materials are cut and fit to
irregular shapes and the sizes are selected to minimize waste and allow handling by installation personnel.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of the specification.
b. Type and class required (see 1.2).
c. When first article inspection is required (see 3.1 and 4.2).
d. Width of type I rolls (see 3.3.1).
e. Size of type II panels (see 3.3.3).
f. Is off-gas testing required? (see 3.13).
g. Packaging requirements (see 5.1).
h. Is Material Safety Data Sheet required? (see 6.4).
i. Toxicity conformance (see 3.11 and 6.5).
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