MIL-PRF-26915D
3. REQUIREMENTS
3.1 Qualification. The primer coatings furnished under this specification shall be products that
are authorized by the qualifying activity for listing on the applicable qualified products list (QPL)
before contract award (see 4 .2 and 6.3).
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that
the materials meet or exceed the operational and maintenance requirements, and promote
economically advantageous life cycle costs.
3.3 Material components. The manufacturer is given latitude on the product design and
components with the following exceptions.
3.3.1 Lead content. The lead content shall not exceed 0.06% by weight of the total solids for the
primer (see 4.7.1).
3.3.2 Hexavalent chromium content. Hexavalent chromium shall not be present (see 4.7.2).
3.3.3 Volatile organic compounds (VOC). The primer shall not contain more than 340 grams per
liter (2.8 pounds per gallon) of VOC for Class A or 250 grams per liter (2.1 pounds per gallon) of
VOC for Class B (see 4.7.3).
3.3.4 Liquid vehicle. The liquid vehicle portion of the primer shall contain no rosin or rosin
derivatives (see 4.7.4).
3.4 Performance characteristics.
3.4.1 Application. The primer shall be suitable for application by spraying over solvent-cleaned,
phosphoric acid treated, zinc phosphated or sand blasted steel. One gallon of primer shall cover a
minimum of 300 square feet at a dry film thickness of 2.5 and 3.5 mils, given a temperature range
of 70°F to 82°F with relative humidity of 50 ± 5% (see 4.6.3.1).
3.4.2 Color. The primer shall contrast the cleaned, sand blasted steel surfaces during primer and
topcoat application (see 4.8.1).
3.4.3 Topcoating properties. The primer shall provide a suitable base for topcoating with
additional coats of primer, aliphatic urethane, and high-solids polyurethane (see 4.8.2).
3.4.4 Pot life. The pot life of the primer shall be a minimum of four hours (see 4.8.3).
3.4.5 Drying time. Maximum time for the primer to dry shall not exceed one hour (see 4.8.4).
3.4.6 Flexibility. A film of the primer, 2.5 to 3.5 mils-dry film thickness, shall show no cracking
or loss of adhesion in the bend area (see 4.8.5).
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