MIL-PRF-2912G (SH)
meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life
cycle costs.
3.3 Construction. Type II material shall be supplied in rolls 36 inches wide minimum and 1/16-inch thick
plus 1/32 minus 0-inch thick. Edges shall be straight.
3.4 Workmanship. Workmanship shall be such as to meet all applicable requirements of this
specification. Surfaces shall be free of surface voids, tears, rips, cuts and free from all foreign matter that may
affect the use of the product.
3.5 Off-gassing. The material shall meet the requirements in the Nuclear Powered Submarine
Atmosphere Control Manual, S9510-AB-ATM-010 Rev 2 of 30 July 1992, for a usage category of Limited (see
4.7 and 6.5).
3.6 Toxicity. The material shall have no adverse effect on the health of personnel when used for its
intended purpose. The material shall be assessed 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 material based on information
submitted by the manufacturer, to assess health hazards associated with the handling, application, use and removal
of the product. The material shall not cause any environmental problems during waste disposal (see 4.8 and 6.6).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
(a) First article inspection (see 4.4).
(b) Conformance inspection (see 4.5).
4.2 Preparation of samples. First article and conformance inspections of Type II rubber compound shall
be performed on a sample prepared as follows: four steel plates shall be prepared for the conformance inspection
of the material. Two steel plates shall be prepared for the first article inspection. The mild steel plates, 12 by 12
by 1/8-inches shall be blasted gray white. Immediately after blasting, one side of each plate shall be coated with
GACO N-11 primer or equivalent to prevent re-oxidation. The primer shall be allowed to dry for a minimum of
one hour and should be thoroughly dry before proceeding with subsequent operations.
4.2.1 For both conformance and first article, a single plate shall be prepared as follows: the plate shall be
coated with one coat of accelerated bonding cement, GACO N-29 or equivalent. After the bonding cement has
dried, it shall be covered with a 1/16-inch layer of accelerated putty, GACO N-250 or equivalent. The putty shall
be allowed to dry for a minimum of 8 hours. A coat of accelerated bonding cement, GACO N-29 or equivalent
shall be applied to the puttied surface and the rubber sheet. A 3-inch wide strip of separating material such as
aluminum foil shall be located between the putty and the rubber sheet along one edge of the plate to facilitate
testing of adhesion between the rubber sheet and the putty. The rubber sheet shall be pressed firmly onto the putty
surface such that no raised or soft spots occur on the panel. A steel roller may be used to assure good adhesion.
4.2.2 The three additional plates for conformance and the single additional plate for first article shall be
prepared as follows: the plate or plates shall be coated with one coat of accelerated bonding cement, GACO N-29
or equivalent. The rubber sheets for each plate shall be coated on both sides with accelerated bonding cement,
GACO N-29 or equivalent. After the bonding cement has dried, the rubber sheet shall be applied to the plate. A 3-
inch wide strip of separating material such as aluminum foil shall be located between the plate and the rubber sheet
along one edge of the plate to facilitate testing of adhesion between the plate and the rubber sheet. A second
rubber sheet shall be coated on one side with accelerated bonding cement, GACO N-29 or equivalent and allowed
to dry. A 3-inch wide strip of separating material such as aluminum foil shall be located between the rubber sheets
along one edge to facilitate testing for adhesion between the plies. The second rubber sheet shall be pressed
firmly onto the prepared plate on top of the first rubber sheet, such that no raised or soft spots occur on the plate.
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