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Ask the Experts Member

Lee Wilmot

Director, EHS
TTM Technologies

Lee Wilmot has 20+ years doing EHS work in the PCB/PCBA industries, including environmental compliance, OSHA compliance, workers compensation, material content declarations, RoHS & REACH compliance. Active on IPC EHS committee and c-chaired committees on IPC-1331, J-STD-609A on labeling & marking, IPC-1758 on packaging and others.

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 ...

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