Questions and Comments

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May 1, 2023
Issues Mixing Silicone and Acrylic Conformal Coatings
Silicones are primarily used for thermal resistance, flexibility, and a T sub g that is higher so that it can be used on assemblies used in higher temps. Also, silicone provides shock and vibration resistance ...
Rick Perkins, Chem Logic

Apr 25, 2023
V-Score and Depanel in One Step
IPC-782 doesn't exist anymore. It was superseded in 2005 by IPC-7351. Furthermore creating bevelled edges for board edge connectors is usually done at the board shop. They can do a proper, controlled bevelling. Any mechanical ...
Frank, PIEK

Apr 17, 2023
Help With Lead to Hole Ratio
On top of above, You also need to consider the metal with which the pin is made. For example, metal A-42 (FeNi) is a poor conductor of heat compared to copper or brass. If the ...
Gabriele Sala, GSC

Mar 27, 2023
Reflow Oven Zone Separation Challenges
There are numerous ways to maximize the differential between zone of a reflow oven. Internal gas flow, static pressure, zone barriers, are just a few. Sometimes moving the peak temperature to a different zone will ...
Fred Dimock, Fred Dimock Global Services

Mar 22, 2023
How To Clean a Vintage Circuit Board Assembly?
Been there and did this: With the circuit board removed from the computer; Very hot water is a fairly large plastic tub with s little green detergent soap, as used for washing dishes. Do not ...
Jaye Waas, Renkus-Heinz