MIL-PRF-2912G (SH)
penetration shall again be measured after the assembly has stood for 48 hours at room temperature. The apparatus
for performing this test shall be as shown on Figure 2.
4.6.8 Hardness. The hardness of the rubber lining shall be measured with a Shore A durometer following
the procedure specified in ASTM D 2240. The reading shall be taken 3 seconds after pressing the durometer
against the lining.
4.7 Off-gassing. The material shall be tested in accordance with the Nuclear Powered Submarine
Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010/(U), by a Government approved
testing facility. The results shall be submitted to the Government for evaluation and approval for use (see 3.9 and
6.5).
4.8 Toxicity. To determine conformance with the requirements of 3.10, the material shall be evaluated
using the HHA process. 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 6.6.
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 command. 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. Type II synthetic rubber compound is intended for use where an acid and oil resistant
surface is desired for the battery compartments of submarines or other compartments aboard ship. Type II is a
prevulcanized material which is lined to the compartment with adhesives.
6.2 Acquisition requirements. Acquisition documents should specify the following:
(a) Title, number, and date of the specification.
(b) When first article is required (see 3.1).
(c) Is off-gas testing required? (see 3.5 and 6.5).
(d) Is NEHC toxicity evaluation required? (see 3.6 and 6.6).
(e) Packaging requirements (see 5.1).
(f) Is Material Safety Data Sheet required? (see 6.4).
6.3 Additional material required to complete adhesion tests contained in this specification and the actual
compartment lining include: priming cement, tie cement, cure accelerator, troweling material and cleaner. These
materials may be obtained from GACO Coatings, 2628 Pearl Road, PO Box 724, Medina, OH 44258. Installation
instructions can be found in S9086-VG-STM-010/CH-634, Chapter 634, Deck Coverings, under the heading of
Acid-Resistant Rubber Sheet.
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.
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