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MIL-PRF-85322 Coating, Elastomeric, Polyurethane, Rain-ErosionThis specification establishes the requirements for rain erosion coatings with a maximum volatile organic compound \(VOC\) content of 420 grams/liter \(g/L\) \(3.5 pounds/gallon \(lb/gal\)\) for use on exterior aircraft structures. The antistatic component \(if applicable\) will have a maximum VOC limit of 720 grams/liter \(g/L\) \(6.0 lb/gallon \(lb/gal\)\).

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MIL-PRF-85322C
3.8.3 Rain-erosion resistance (Type I and II, Class A and B, Grade A and B rain erosion
coatings). The coating(s), tested in accordance with 4.6.9, shall possess a minimum of 30
minutes erosion time without eroding through the coating at a dry-film thickness of 12-14 mils
(304-356 microns [µ m]). For Class B coatings, an additional set of panels after heat resistance
exposure (see 4.6.9.1) shall be tested with a minimum of 30 minutes erosion-time.
3.8.4 Accelerated weather resistance. The test coating(s), applied to two test panels when
exposed to accelerated weathering for 500 hours in accordance with 4.6.10, shall exhibit no
cracking, checking, embrittlement, nor loss of adhesion.
3.8.5 Hydrolytic stability. The coating, when tested in accordance with 4.6.11, shall exhibit
no softening or loss of adhesion.
3.8.6 Electrical transmission. The test coating, applied to test panels in accordance with
4.6.12.1 and tested in accordance with 4.6.12.2 through 4.6.12.5, shall meet the requirements
specified in table II.
3.8.7 Surface resistivity (Grade B only). The resistivity of Type I and II, Grade B coatings,
applied to test panels in accordance with 4.6.13.1 and tested in accordance with 4.6.13.2 and
4.6.13.3, shall be in accordance with table II.
TABLE II. Electrical transmission.
Requirement
After 7 day cure
After 7 day cure
Characteristic
at 75º ±5 ºF
plus 7 days at
(24º ±3 ºC) and
100 ºF (38 ºC) and
RH of 50 ±10%
RH of 90%
Electrical transmission
90%
85%
(minimum)
Surface resistivity
0.5 to 15 megohms
0.5 to 15 megohms
3.8.8 Thermal conductivity (Class B only). The coating when tested in accordance to 4.6.14
shall have a minimum thermal conductivity of 0.4 W/(m· K) (watts per meter Kelvin).
3.9 Working properties.
3.9.1 Application. The coatings shall be capable of being applied by brushing or spraying
to plastic laminates, composites and aluminum alloy substrates. The material shall be mixed in
accordance with the manufacturer's instructions.
3.9.2 Strippability. The rain erosion and antistatic test coatings shall be capable of being
completely stripped through to the substrate, when processed as specified in 4.6.15.
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