gal\)\).

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MIL-PRF-85322C

consist of two or three components, Component A, typically a polyurethane base component,

Component B, a curing agent, and Component C, a thinner (if applicable), but is not limited to

this packaging.

3.4.5 Volatile content. The maximum volatile organic compound (VOC) content of the rain

erosion coating shall be a maximum of 420 g/L when tested as specified in 4.6. The maximum

volatile organic compound (VOC) content of the antistatic coating (Grade B) shall be a

maximum of 720 g/L when tested as specified in 4.6. Brominated and chlorinated solvents,

except for para-chlorotrifluoromethylbenzene or equal, shall be prohibited in the formulation of

these coatings.

3.5 Component properties.

3.5.1 Condition in container. All components of the rain-erosion and antistatic coatings

shall be uniform, homogeneous, and free of skins, lumps, gels, or coarse particles. There shall be

no separation of ingredients which cannot be readily dispersed to a smooth, homogeneous state

by mixing with a hand paddle. The coating containers shall exhibit no evidence of excessive

pressure or be deformed by gassing.

3.5.2 Storage stability. The unopened coating components, as packaged by the

manufacturer, when admixed shall meet all of the requirements of this specification after storage

for a minimum of six months at 90 �F (32 �C) (see 6.3.2).

3.5.3 Accelerated storage stability. The coating components, after storage for 4 days (see

4.6.1) as packaged by the manufacturer, when admixed shall meet all of the requirements of this

specification as specified in 4.6.1. The container shall not develop excessive internal pressure,

capable of causing it to swell.

3.6 Liquid properties.

3.6.1 Viscosity. The steady-state viscosity of the rain erosion and antistatic (if applicable)

admixed coatings shall be not greater than 4000 centipoise (cP), when tested as specified in 4.6

and 4.6.2.

3.6.2 Pot life. When maintained in a full, closed container, in accordance with 4.6.3, the

pot life of the admixed coating(s) shall be a minimum of two hours at a temperature of

73.5� �2 �F (23� �1.1 �C) and relative humidity (RH) of 50 �10 percent. After exposure to these

conditions, the admixed coating(s) shall show no signs of gelation or an increase in viscosity of

more than 50 percent, and be capable of being spray applied to a smooth, uniform coating, in

accordance with 3.7.1.

3.6.3 Fineness of grind. The fineness of grind (when measured on the Hegman scale) of the

admixed coating shall be a minimum of 5, when tested as specified in 4.6.