MIL-PRF-2912G (SH)
A steel roller may be used to assure good adhesion. The completed sample shall be visually observed for evidence
of softening or decomposition of the rubber compound at the interfaces with the primer, accelerated bonding
cement and accelerated putty.
4.3 Preparation of test specimens. The test specimens shall be prepared in accordance with the
requirements of the tests as specified herein.
4.4 First article inspection. First article inspection of the samples shall consist of the tests specified in
4.4.1, 4.7 and 4.8.
4.4.1 First article tests. Samples prepared as specified in 4.2 or 4.3, as applicable, shall be tested for
following properties:
(a) Tensile strength and elongation (see 4.6.2).
(b) Adhesion (see 4.6.3), both samples.
(c) Oxygen pressure aging (see 4.6.4).
(1) Tensile strength and elongation (see 4.6.4.1).
(2) Adhesion (see 4.6.4.2).
(d) Immersion in acid (see 4.6.5).
(1) Weight (see 4.6.5.1).
(2) Tensile strength and elongation (see 4.6.5.2).
(e) Immersion in oil (see 4.6.6).
(1) Volume (see 4.6.6.1).
(2) Tensile strength and elongation (see 4.6.6.2).
(3) Adhesion (see 4.6.6.3).
(f) Plastic flow (see 4.6.7).
(g) Hardness (see 4.6.8), double rubber ply sample only.
4.5 Conformance inspection. Conformance inspection shall consist of the examinations and tests
pertaining to the material (see 4.5.1)
4.5.1 Conformance inspection of the material. The following examinations and tests shall be performed
on test specimens of the material. All tests shall be conducted on the two rubber sheet ply samples. Only the
subparagraph (a) adhesion test shall be conducted on the putty and rubber sheet ply sample:
(a) Adhesion (see 4.6.3).
(b) Hardness (see 4.6.8).
4.5.2 Rejection. If the material fails to conform to all the requirements for which it is tested, the lot of
the material represented by the samples or test specimens shall be rejected.
4.6 Methods of examination and test. No tests shall be made on Type II material until the curing time of
24 hours has elapsed; however, this curing time shall not exceed 14 days.
4.6.1 Visual examination. A visual examination shall be conducted to detect defects in workmanship to
ensure conformance to 3.4. MIL-STD-289 shall be used to determine and evaluate defects.
4.6.2 Tensile strength and ultimate elongation. Tensile strength and ultimate elongation shall be
determined in accordance with ASTM D 412. Dumb-bell specimens shall be prepared using die C. The material of
the specimens shall have a uniform thickness within the range of 0.70 to 0.80 inch and shall have an equivalent cure
to the rubber lining material.
4.6.3 Adhesion. The adhesion between plies and between the rubber and steel and between rubber and
putty shall be measured at room temperature, 70 to 90 degrees Fahrenheit (ºF), on a 12 by 12 inch panel. The
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