MIL-PRF-24635E
3.5.5 Storage stability. (see 4.5.5)
3.5.5.1 Partially-full container (types II, III, and IV only). The coating components shall show no skinning.
After aging, the coating components shall show no surface float (separated pigments or other ingredients on the
surface of the liquid), livering, curdling, hard caking or gummy sediment. The components shall mix readily to a
smooth uniform state within 5 minutes when mixed with a paddle or mechanical mixer and shall have a consistency
not greater than 5 units from the original Kreb unit consistency before testing (see 3.5.8). At the end of the 7-day
period specified in 4.5.5.1, the mixed coating shall continue to meet the requirements of 3.5.10, 3.5.11, 3.5.12,
3.5.14, and 3.5.17. The CIELAB color difference of the mixed coating shall be not greater than 0.5 CIELAB units
from the original color values measured prior to the required storage period.
3.5.5.2 Full container. The coating components shall show no skinning, livering, curdling, hard caking, or
gummy sediment. The components shall mix to a smooth uniform state with no surface float (separated pigments or
other ingredients on the surface of the liquid) within 5 minutes when mixed with a paddle or mechanical mixer and
shall have a consistency not greater than 5 units from the original Kreb unit consistency before testing (see 3.5.8).
After the shelf life duration (see 4.5.5.2), the mixed coating shall continue to meet the requirements of 3.5.10,
3.5.11, 3.5.12, 3.5.14, and 3.5.17. The CIELAB color difference of the mixed coating shall be not greater than 0.5
CIELAB units from the original color values measured prior to the required storage period.
3.5.5.3 Accelerated storage stability. A previously unopened, original container of each coating component
shall be re-dispersible within 5 minutes with a paddle or mechanical mixer to a uniform condition free of grit, seeds,
skins, lumps, livering, pigment settling or surface float. The mixed coating shall continue to meet the requirements
of 3.5.8, 3.5.10, 3.5.11, 3.5.12, 3.5.14, and 3.5.17. The CIELAB color difference of the mixed coating shall not be
greater than 0.5 CIELAB units from the original color values measured prior to the required storage period.
3.5.6 Water content (non water-based systems only). The water content of the mixed coating shall not be
greater than 0.5 percent by weight.
3.5.7 Coarse particles. The coarse particles (and skins for Types II, III, and IV coatings) shall not be greater
than 0.5 percent by weight of the mixed coating.
3.5.8 Consistency (types II, IV, V, and VI only). The consistency of the mixed coating shall not exceed 120
Krebs units.
3.5.8.1 Consistency (type III). The consistency of Type III coating shall not exceed 90 Krebs units.
3.5.9 Fineness of grind. The fineness of grind of the mixed coating shall receive a minimum ASTM D1210
rating of six.
3.5.10 Brushing properties. The coating shall brush satisfactorily and shall dry to a uniform film, free from
seeds, runs, sags, or streaks.
3.5.11 Rolling properties. The coating shall roll satisfactorily and shall dry to a uniform film, free from seeds,
runs, sags, or streaks. The dried film shall show an even, smooth finish.
3.5.12 Spraying properties. The coating shall spray satisfactorily and shall show no running, sagging,
streaking, or orange peel. The air-dried film shall show no seeding, dusting, floating, mottling, hazing, or other film
defects.
3.5.13 Sag resistance. The sag resistance for each coat of the coating system shall be at least twice the
manufacturer's recommended wet film thickness (WFT) for that coat.
3.5.14 Drying times.
3.5.14.1 Types II, III, and IV coatings. The coating's set-to-touch time shall be less than 2 hours, and the dry-
through time shall be less than 8 hours.
3.5.14.2 Types V and VI coatings. The coating's set-to-touch time shall be less than 1 hour, and the dry-
through time shall be less than 4 hours.
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