IPC-SM-840, Revision E, on Qualification and Performance of Permanent Solder Mask has just been released and is available from Document Center Inc.
The new 19-page standard establishes the requirements for the evaluation of liquid and dry film solder mask material and for the determination of the acceptability of use on a standard printed board system. It provides two classes of requirements, T and H, to reﬂect functional performance requirements and testing severity based on industry/end use requirements. Coverage is given to adhesion, material qualification, resistances to solvents, and electrical requirements.
The new Revision E incorporates requirements for flexible cover materials used as a flexible dielectric protective layer over etched conductors and other conductive features.
Copies of this popular IPC document and all IPC publications are available from Document Center Inc. at our website www.document-center.com. You can also reach us by phone at 650-591-7600, fax at 650-591-7617, and via email at firstname.lastname@example.org.
We’ll be happy to assist you with any Standards needs you may have.