Lee Wilmot

Lee Wilmot has submitted responses to the following questions.

Max Peak Topside Reflow Temperature
S.M. should check J-STD-020D, section 4, tables 4-1 and 4-1. ...

Conformal Coating in Nitrogen Environment
Conformalcoatings are basically a resin dissolved in a solvent. Most conformal coatingsutilize a flammable solvent. Once the coating is applied, ...

RoHS Bill of Materials Crosscheck
J-STD-609A requires the labeling of component maximumtemperatures. Here’s an example from that standard. You should contact your BGAsupplier re: labeling ...

Trichloroethylene Alternative
Some non-halogenated solvents that can be used for degreasing and/or defluxing PCAs and components include d-limonene and n-methylpyrrolidone. ...

Rise of Bismuth Levels in our Solder Pots
J.G.does not state which solder he uses. From the appendix of the J-STD-609A standard, I noticed that 2 solder alloys ...

Challenging Cleaning Problem
My expertise is EHS, not electronic design or assembly. However, there is a cleaning method that may be used for ...

Spotting After DI Water Cleaning
It sounds like there's some organic fouling of the IX resin. Is there a carbon pre-filter prior to the IX ...

Cause of Green/Blue Oxide Buildup
Blue copper compounds include copper hydroxide (Cu(OH)2)- light blue, which can convert to copper carbonate (greenish); copper nitrate (Cu(NO3)2) and ...

Reflow Oven Calibration Schedule
What does the reflow oven manufacturer recommend? ...

Deionized Water Sample Testing
I don't have direct DI sampling experience, but do know that water samples for just pH measurement can change over ...