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MIL-PRF-4556F

3.6.2.1 Component A. When tested as specified in 4.3.11.1, component A shall

show no skinning, livering, curdling, hard dry caking or tough gummy sediment.

shall remix readily to a smooth homogeneous state and shall meet all other

requirements of this specification.

3.6.2.2 Component B. When tested as specified in 4.3.11.2, a can of component B

shall be clear and free from sediment and suspended matter. It shall show no

livering, curdling, gelling or skinning in a freshly opened container.

3.6.3 Mixing properties. When tested as specified in 4.3.12, smooth homogeneous

mixtures shall result, and shall be free from grit, seeds, skins or lumps.

3.6.4 Spraying properties. When

tested as specified in 4.3.13, the coatings

shall spray satisfactorily in all

respects and shall show no running, sagging or

streaking. The dried films shall

show no dusting, mottling or color seperation

and shall present a smooth finish

free from any defects.

3.6.5 Brushing properties. When tested as specified in 4.3.14, the coatings

shall brush easily. They shall dry to smooth, uniform films free from sags, runs

and streaks.

3.6.6 Knife test. When tested as specified in 4.3.15, the coating shall adhere

tightly to and not flake or crack from the metal surface. The cut shall show

beveled edges and there shall be no delamination between the primer and the

topcoat.

3.6.7 Pot life. When tested as specified in 4.3.16, the viscosity of each

sample, 4 hours after mixing its two components, shall be 100 krebs units (KU)

maximum and it shall meet all of the requirements of 3.6.4.

3.6.8 Fuel and water resistance. When tested as specified in 4.3.17, the panels,

upon removal, shall show no softening or loss of adhesion. A moderate darkening

of the area immersed in JP-8 fuel is acceptable. There shall be no blistering to

a greater extent than three small random blisters. Blister formation within 1/4

inch of the panel edge shall be ignored.

3.6.9 Adhesion. When tested as specified in 4.3.18, both areas of each panel

shall have a rating of 3B or higher. There shall be no evidence of film

separation between primer and topcoat.

3.6.10 Impact resistance. When tested as specified in 4.3.19, the area showing

cracking and a slight loss of adhesion shall be no greater than 15mm diameter.

3.6.11 Identification marking. In addition to the markings specified, all

containers shall be legibly marked or labeled with the following (see 6.2):

CAUTION: The Surgeon General requires airline respirators to be used unless air

sampling shows exposure to be below standards, then either chemical cartridge

respirators or airline respirators are required. Avoid contact with skin and

eyes. Use with adequate ventilation. Keep containers tightly closed. For other

safety recommendations refer to the material safety data sheet.

VERIFICATION

4.1 Verification alternatives. Alternative test methods, techniques, or

equipment, including the application of statistical process control, tool control,

or cost effective sampling procedures may be proposed by the contractor.

Acceptable alternative verification approaches shall be identified in the

contract.