MIL-DTL-27443F (USAF)
Requirement
Minimum
Maximum
Insoluble Matter
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20%
Amylaceous Matter
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None
pH
2.5
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Working Life, hours
2
8
Storage Life
2 years
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The adhesives shall be identified when received and the certified test report of each container shall be
retained and identified to the container. Tensile shear specimens, not less than 4, shall be prepared and
tested prior to use of each adhesive in production. The minimum acceptable test result of any specimen
shall be 4,200 psi at 75oF. The minimum acceptable test result of any urea-resin specimen shall be as
specified in ASTM D4690. After a container of adhesive has been out of production 96 hours or
longer, it shall be tensile shear tested as above before placing it back into production. The contractor
shall develop a control procedure to ensure that the adhesives are controlled at all times. This shall
include, but not be limited to, storage control, method of issue to production, method of specimen
preparation, amount of adhesive, cleaning, cure pressure and temperature. Specification MMM-A-132
shall be used as guide in test specimen fabrication for metal to metal and metal to balsa bonds. Urea-
Resin test specimens shall be prepared according to ASTM D4690 (see 4.5.1).
3.2.3.1 Adhesive dye. A red dye shall be added to the adhesive (see 3.2.3) to identify the pallet as
one manufactured with a thermally cured adhesive (see 4.5.1).
3.2.4 Balsa Wood. The balsa wood shall be in accordance with MIL-S-7998. Paragraphs 3.3, 3.5,
and 4.3.2 of MIL-S-7998 shall not apply. The density requirements of paragraph 3.4 of MIL-S-7998
shall be deleted and a minimum of 6 pounds per cubic foot substituted. In addition to the defects listed
in paragraph 3.7 of MIL-S-7998, the following defects are acceptable:
a. Scattered pin holes shall not exceed 0.093 inch diameter (see 4.5.1).
b. Stains (mild blue or mineral) not associated with decay (see 4.5.1).
c. Four checks or splits are permitted per lateral surface; however, these checks or splits shall not
cause the wood to separate during fabrication. The check or split shall not be wider than 3/32 inch.
There shall be no limitation on the lengths of such defects (see 4.5.1).
d. Sound, tight knots (see 4.5.1).
e. Occasional bird's eye blemishes shall not exceed 0.375 inch in width (see 4.5.1).
f. Wane shall be permitted on two edges; the width shall not exceed 0.093 inch (see 4.5.1).
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