MIL-PRF-22750G
4.6.2 Test panels. Steel test panels shall be cold-rolled SAE 1010 steel conforming to ASTM
A109/A109M or ASTM A1008/A1008M, treated with a zinc phosphate coating in accordance with
TT-C-490, type I. The panels shall have a Rockwell B hardness of 55 to 75 and a surface roughness
of 30 to 45 micro inches (arithmetic average) as rolled. Aluminum test panels shall be aluminum
alloy 2024-T3 treated with MIL-DTL-5541, type II.
4.6.2.1 Epoxy primer. Test panels shall be solvent cleaned prior to applying epoxy primer. Apply
epoxy primer conforming to the latest revision of MIL-DTL-53022 or MIL-DTL-53030 to a dry
film thickness of 1.5 ± 0.2 mils (37.5 ± 5 microns). For aviation system application evaluation,
MIL-PRF-23377 or MIL-PRF-85582 epoxy primers shall be used and applied to a dry film
thickness of 0.6 - 0.9 mils (15 - 22.5 microns). Allow the primer coatings to air dry according to
the requirement of the primer in use for these tests prior to the application of the topcoat.
4.6.2.2 Application of coating. The coating under test shall be admixed and allowed to stand for
30 minutes prior to use. The coating shall then be spray applied to the test panels to a dry film
thickness of 2.0 ± 0.2 mils (50 ± 5.0 microns). The test panels shall be air dried for a minimum of
7 days prior to testing. For type III, the coating shall be spray applied directly on steel and
aluminum panels pretreated as in 4.6.2 to a dry film thickness of 2 ± 0.2 mils (50 ± 5 microns). The
test panels shall be air dried for a minimum of 7 days prior to testing. Primers, as specified in
4.6.2.1, shall not be used with the type III coating.
4.6.3 Test procedures. Tests (see table II) shall be in accordance with ASTM, GMW, or as
specified herein. The right is reserved to make any additional tests deemed necessary to determine
that the coating meets the requirements of this specification.
TABLE II. Test methods.
Requirement
Item
ASTM Method
Test Paragraph
Paragraph or Table
3.3.1
Pigment analysis
D2371
4.7.1
3.3.1 and Table I
Lead content
D3335
4.7.1.1
-
4.7.1.2
3.3.1 and Table I
Hexavalent chromium
VOC
D3960
4.7.2
3.3.2 and Table I
VOHAP content 1/
D3271
4.7.3
3.3.2 and Table I
Specular gloss
D523
4.7.4
Table I
Fineness of grind
D1210
-
Table I
Hiding power
D2805
4.7.5
Table I
Infrared reflectance
E308 and E1331
4.7.6
Table I
Drying time
D5895
4.7.7
Table I
Viscosity
D1200
4.7.8
Table I
Coarse particles
D185
-
Table I
Condition in container
-
4.7.9
3.5.1
Storage stability
D1849
4.7.10
3.5.2
12
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business