MILPRF55110G
APPENDIX A
A.4.8.2.4
A.4.8.2.4 Registration. Registration shall be determined by either evaluating microsectioned test coupons (method
II, see A.4.8.2.4.1) or by evaluating of special registration coupons when provided (method III, see A.4.8.2.4.2).
A.4.8.2.4.1
A.4.8.2.4.1 Method II (by microsectioned sample units). Registration shall be evaluated using the internal annular
ring measurement. Two test specimens (any combination of the "as received" (see A.3.7.2.1) and "thermal stress"
(see A.3.7.4.8) microsections) from diagonally opposing panel corners shall be inspected. Both test specimens shall
have been microsectioned in the vertical plane with one test coupon representing the panel's length (X axis) direction
and the other representing the panel's width (Y axis) direction.
A.4.8.2.4.2
A.4.8.2.4.2 Method III (optional) (by registration test coupons). Registration test coupons and techniques, when
provided by the printed wiring board fabricator, shall be evaluated in accordance with methods approved by the
qualifying activity and when applicable, the acquiring activity. Unapproved methods of measurement using
registration test coupons shall be backed up by method II of A.4.8.2.4.1 using the appropriate test coupons (see table
A-IV) from the same panel. Two non-destructive methods for determining registration are available using the
following test coupon designs:
a.
Test coupon F (etch factor not needed).
b.
Test coupon R (etch factor of each layer needed).
If other registration test coupon designs and requirements are provided as an element of the design documentation
set, registration can be evaluated in accordance with the criteria specified on the applicable master drawing.
A.4.8.3
A.4.8.3 Chemical inspection.
A.4.8.3.1
A.4.8.3.1 Cleanliness (by resistance of solvent extract) (see A.3.7.3.1 and A.6.4). The printed wiring board shall
be tested for cleanliness in accordance with test method number 2.3.25 of IPC-TM-650. Other alternate test methods
not specified in A.6.4 may be used in lieu of test method number 2.3.25 of IPC-TM-650 only when specifically
approved by the Government acquisition activity. Such approval shall be determined on the basis that the alternate
test method is demonstrated to have equal or better sensitivity and employs solvents with the ability to dissolve flux
residue as does the alcohol-water solutions specified in test method number 2.3.25 of IPC-TM-650.
A.4.8.3.2
A.4.8.3.2 Resistance to solvents (marking ink or paint) (see A.3.7.3.2). Marking ink or paint resistance to solvents
shall be tested in accordance with test method number 2.3.4 of IPC-TM-650. The following details apply:
a.
The marked portion of the test specimen shall be brushed.
After the test, the test specimen shall be visually inspected in accordance with A.4.8.1 for legibility of
b.
marking and the requirements of A.3.7.3.2.
A.4.8.3.2.1
A.4.8.3.2.1 Sampling procedures and test specimens. The resistance to solvents test shall be performed either
during group A (every lot) or during group B (monthly). The test specimens can be either production printed wiring
boards or quality conformance test circuitry strip identification areas containing ink or paint marking. The minimum
number of samples shall be at least one sample for each solution specified by the applicable test method (i.e., one
sample for each solution required).
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