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Lee Wilmot

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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, ...
Wave Soldering System Nitrogen Use
A simple answer to your Q is put in a flow meter and measure it. However, Isense that you do ...
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 fordegreasing 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-609Astandard, I noticed that 2 solder alloys have ...
Challenging Cleaning Problem
My expertise is EHS, not electronic design or assembly. However, there is acleaning method that may be used for your ...
Spotting After DI Water Cleaning
It sounds like there's some organic fouling ofthe IX resin. Is there a carbon pre-filter prior to the IX beds ...
Cause of Green/Blue Oxide Buildup
Bluecopper compounds include copper hydroxide (Cu(OH)2)- light blue, which canconvert to copper carbonate (greenish); copper nitrate (Cu(NO3)2) and coppersulfate (CuSO4).Greencopper ...
Reflow Oven Calibration Schedule
What does the reflow oven manufacturerrecommend? ...
Deionized Water Sample Testing
I don't have direct DI sampling experience, but do know that water samples forjust pH measurement can change over time ...