MIL-P-38336A(USAF)
3. REQUIREMENTS
3.1 Components. The inorganic zinc rich primer shall be a ready-to-mix, two component material. The two component material shall be furnished in separate companion containers; the dry zinc dust shall be in one container and the liquid inorganic vehicle in the other container. The container size, where specified, shall refer to the liquid vehicle container which shall hold enough of the vehicle to provide the specified volume of the mixed primer. For example, a one gallon container shall be of the standard one gallon size and shall contain adequate amount of liquid vehicle to provide a minimum of 231 cubic inches of the mixed primer. The primer must be furnished in pint, quart, half gallon, one gallon or larger containers as specified by the procuring activity.
3.2 Material. Except where otherwise specified, the manufacturer is given latitude in the selection of raw materials and processes of manufacture but shall be restricted by the requirements of this specification. The materials used shall be of high quality and entirely suitable for the purpose intended.
3.2.1 Toxic products and formuations. The material shall have no adverse effect on the health of personnel when used according to provided instructions and for its intended purpose. Questions pertinent to this effect shall be referred by the procuring activity to the appropriate department medical service who will act as an advisor to the procuring activity.
3.2.2 Zinc dust pigment. The zinc dust pigment shall conform to the requirements of TT-P-460, type II.
3.2.3 Liquid vehicle. When the liquid inorganic vehicle portion of the primer cannot be thinned with water, dilute with organic solvents as specified herein.
3.2.3.1 Thinner. Denatured ethyl alcohol conforming to MIL-S-6091 shall be used as required for thinning the primer.
3.2.3.1.1. Denatured ethyl alcohol. Denatured ethyl alcohol shall be used only when applying the organic solvent dilutable primer to structures located in outside environments. The application procedure is necessary because of the potential fire hazard created by the low flash point of ethyl alcohol.
3.3 Quantitative requirements. The primer shall meet the quantitative requirements as specified in table I.
TABLE I. QUANTITATIVE REQUIREMENTS OF PRIMER
Characteristic |
Minimum Requirements |
Nonvolatile (solids) content, percent by weight, of vehicle Zinc content, percent by weight, total zinc solids of zinc dust pigmented primer Flash point °F, of ethyl alcohol diluted primer Weight per gallon in pounds |
32 80 65 18 |
3.4 Quantitative requirements
3.4.1 Mixing. When tested as specified in 4.6.4, the zinc dust pigment shall be easily mixed, by hand, into the inorganic vehicle to form a smooth, homogeneous material free from lumps, or other objectionable characteristics.
3.4.2 Odor. When tested as specified in 4.6.1, the odor of the wet primer and the dry film shall not be obnoxious.
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