The following specifications establishes material requirements and process procedures for Gun Kote. A coating developed for ordnance usage on equipment and weapons, providing excellent corrosion protection, abrasion resistance, and the lubricity to meet automatic weapon dry firing requirements after 60 days sea water immersion.

Applicable Specifications:

The following documents form a part if this specification to the extent specified herein.

Material Requirements:

Component material used in the manufacturing of this coating consist of abrasion resistant corrosion inhibiting and lubricating solids dispersed in a suitable binder using a solvent carrier.

Baking/Curing

Coating shall be fully cured when baked as follows:

All colors 60 min at 150 degrees C

Appearance:

The bonded coating shall appear uniform in color, smooth free from cracks, runs, scratches, pinholes, blisters, bubbles, sags, and foreign matter.

Thickness:

The thickness of the coating shall be between 8 and 12 um unless otherwise specified.

Adhesion:

Place a strip of masking tape (UUT-106) firmly on the cured coating, with a quick motion remove the tape. Tiny particles are permissible, but the lifting of the coating to the base material is cause for rejection.

Thermal Stability:

The cured coating shall withstand exposure at a temperature of 260 degrees C for 100 hours minimum and 1000 hours minimum soak at -50 degrees C when tested for adhesion requirements.

Minimum initial oxidation temperature 460 Degrees C

Thermal breakaway @ 500 degrees C Minimum

Fluid Resistance:

>Coating shall meet requirements of Adhesion after immersion in the following fluids for time specified.

Corrosion Resistance:

The cured coating when applied to bare sandblasted (120 Nevada dry sand @ 30 psi) to cold rolled steel test panels conforming to QQ-S-698 shall pass the following test procedures with maximum of three (3) rust dots per panel.

ASTM B117-63T Salt spray fog testing for 1000 hours, minimum rating 9

ASTM D-1654-61 Corrosion Protection Minimum rating 9

ASTM D-870-54 DI Water immersion minimum 1000 hours @ 37 degrees C

60 Days sea water immersion

Impact Resistance

Minimum.375 in. deformation before loss of adhesion evidenced by cracking and peeling of coating on upset area of panel when struck with a .250 in. radius round nosed impact rod.

Dielectric Strength:

Minimum insulation with a 50 VAC applied, 1100 MEG OHM. insulation breakdown @ 500 VAC minimum applied to test specimen.

Abrasion Resistance:

Wear life when test panels tested on tabor abrasive with #cs10 wheel installed @ 500 gram weight minimum 235 revolutions (average of 3 test specimens) minimum 225 revolutions (low test specimen).