55110 is now at rev H, for whatever that is worth.

Some specific points in which 55110 differs from 31032/1 are:

External annular ring in 55110 - 2 mils, in 31032 - 25 microns, defaulting to class 3 requirement

Marking adhesion test is done as monthly solvent resistance test in 55110, is done for each production lot and a different test method in 31032

55110 has no 'permitted defect allowance', i. e., any good material is shippable; 31032 has PDAs of 32%, 50%, 50% for Lot Conformance Inspection subgroups 1, 2, 3

LCI subgroup 1 coupon requirements in 55110 are greater than in 31032

55110 calls for triennial re-qualification via a standard test vehicle; 31032 calls for biennial 'capability verification inspection' to different criteria.



If you are qualified to a PCB technology via 31032, you may certify that technology to 55110 via appendix B of 55110.  Which means you build to 31032 requirements, and prepare, as the last step, a certificate of conformance saying the boards (those conforming to 31032) are conformant to 55110.

Don't ask me why there are two rigid board specifications.  MIL-P-50884, the flex board speak, has been subsumed into MIL-PRF-31032/3 and /4, if I understand correctly.  So we have three board specifications when one (31032) would seem to cover everything.    Louis Hart


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ramakrishnan Saravanan
Sent: Wednesday, October 14, 2015 10:44 AM
To: [log in to unmask]
Subject: [TN] Difference between MIL-PRF-55110G and 31032

Hi,

I am in the business of making high reliability PCBs. 

What are the major difference between the standards 


MIL-PRF-55110G and MIL-PRF-31032/1


regards,


R.Saravanan

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