MIL-DTL-3688D
3. REQUIREMENTS
3.1 Material. The material furnished under this specification shall be a uniform, stable aqueous
emulsion of waxes, resins, and emulsifying agents together with suitable rust inhibitors capable
of meeting all the requirements of this specification. The emulsion shall be supplied ready for
application at room temperature 77° ± 5°F (25° ± 2°C) by spray, dip or brush methods.
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials shall be used to the maximum extent possible provided that
the material meets or exceeds the operational and maintenance requirements and promotes
economically advantageous life cycle costs.
3.3 pH value. The pH of the wax emulsion shall be between 8.0 and 9.0 when tested as
specified in 4.4.1.
3.4 Volatile matter. The emulsion shall be free from volatile organic solvents when tested as
specified in 4.4.2. The volatile shall be water with not more than 1.0 percent by weight perfume
or perfume solvents.
3.5 Nonvolatile matter (total solids). The nonvolatile content of the wax emulsion shall be not
less than 12 percent by weight when tested as specified in 4.4.3.
3.6 Wax and resin content. The wax and resin content of the emulsion shall be not less than 8
percent by weight when tested as specified in 4.4.4.
3.7 Ash content. The ash content of the wax emulsion shall not exceed 0.5 percent when tested
as specified in 4.4.5.
3.8 Free alkali. There shall be no free alkali present when tested as specified in 4.4.6.
3.9 Softening point (dropping point). The softening point of the wax shall be not less than
165°F (74°C) when tested as specified in 4.4.7.
3.10 Stability to centrifuging. The emulsion shall be free from particles, granules and foreign
agents as shown by centrifuging as in 4.4.8. The material shall remain homogeneous and no
more than 3 percent by weight shall settle out.
3.11 Drying time. The wax emulsion shall dry to a hard flexible surface within 20 minutes and
shall form a non-tacking film when tested as specified in 4.4.9.
3.12 Appearance of dried film. A film of the wax, prepared and tested as specified in 4.4.10,
shall show no signs of whiteness and shall have a smooth, lustrous finish. The film shall be
clear, free from particles and practically colorless.
3.13 Dipping properties. The unreduced wax emulsion shall dip and flow out in a continuous
film and shall deposit 0.30 gm maximum per ft2 of coating when prepared and tested as in
4.4.11.
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