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This site features Outgassing Data for Selecting Spacecraft Materials, which lists products that the Goddard Space Center has tested (and the tests results) Not all materials tested have passed the TML and CVCM specifications Independent test labs can also be used to test for this property 33426 Other Customer Industry Application Specifications (AABUS) Often PCB customers have special requirements for their solder mask These can be a modification of the IPC criteria or some additional requirement not included in the SM-840 document There is a term used to describe these requirements: as agreed between user and supplier (AABUS) The key word here is agreed, since both parties must be completely aware of the requirement and what it takes to achieve the required result..

Environmental and Health Considerations 33.4.3.1 RoHS Compliance. Most PCB fabricators now insist that any solder mask products they use be compliant with Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment, the RoHS directive, and Directive 2003/11/EC, the 24th amendment to Council Directive 76/769/EEC. This directive places requirements on specific materials and amounts of each that may be included in a formulation. Meeting this criterion is essential for most printed wiring board (PWB) fabricators. 33.4.3.2 Lead-Free. One of the materials eliminated with RoHS compliance is lead. The largest impact of eliminating lead is the higher soldering temperatures required for lead-free solders. Soldering temperatures for these alloys are typically 10 to 20 C hotter than for eutectic tin-lead solders. For example, one of the current alloys of choice is SAC-305 (tin-silver-copper solder) has a melting point 34 C higher than eutectic solder. Higher temperatures place

Unless you re a professional speaker, don t rely on your slides to be your cues for the whole talk. Make a few notes on paper as a guide. Be sure to number the pages!

additional stress upon the solder mask and could potentially lead to adhesion loss, color change, embrittlement, or cracking. 33.4.3.3 Low Halogen. The low-halogen requirement came about due to concerns about incineration of scrap PCBs generating dioxins under some conditions, and originally centered on some brominated flame retardants used in base laminates. It progressed from that into an additional concern over the chlorine content. This requirement is sometimes referred to as halogen-free, but in reality, the true requirements place a limit on the amount of bromine, chlorine, and their sum in the content of the material. Current low-halogen requirements on the cured solder mask are as follows:

Although solder masks do not typically contain flame retardants, and hence no bromine, they often contain chlorine. The chlorine generally comes from pigments that give the mask its desired color, and also from residual catalyst from the resin (solder mask raw material) manufacturing process. A number of manufacturers offer low-halogen solder mask materials that meet the specified criteria.

Circuit Density Issues As the pitch of circuitry and packages has decreased, it has also generated the demand for smaller holes and finer solder mask features 33441 Hole Size As mentioned in Sec 33212, small hole sizes are a significant challenge for the solder mask process All application processes introduce some solder mask into the holes, and this material must be removed (developed) from the holes before curing There are two primary considerations in achieving finished PCBs with no mask in the holes First, it is easier to achieve mask-free holes when less solder mask is introduced into the holes during the application process In general, spray applications put the least mask into holes, and single-sided screening introduces the most Curtain coating and simultaneous double-sided screen printing produce more moderate levels of solder mask in holes.

For the remaining terms, we use the fact that we are using a torsion-free connection, and therefore a bc = a cb , so we nd

The ability to remove all solder mask from the holes is dependent upon the solder mask material itself, the tack drying, and the developing processes Some solder masks inherently develop faster than others, so the choice of products has a significant impact on development If the solder mask is subjected to an overly aggressive (too hot and/or too long) tack drying process, the mask may not develop at its optimum speed The developing equipment and process should be set up according to the solder mask manufacturer s recommendations This includes the chemistry, pressures, flow rates, nozzle type(s), process cycle times, and so on 33442 Solder Dams ( Webs ) To reduce soldering defects in assembly, designers have placed fine solder dams, or webs, between attachment pads The width of these dams is frequently in the 25 to 3.