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I've been working with MEK for years with no apparent health issues. MEK is the solvent of choice for virtually al adhesives except CA and epoxies used in speaker building and repair. I do have positive ventilation running when I'm working with the stuff, but have never worn a mask or gloves.

I might add that MEK is nowhere near as volatile as acetone or methylene chloride and for most things is a better solvent.

I'm 69 years old and as long as I get my afternoon nap, I'm OK to go. Maybe if I had spent my life avoiding all potential toxicity, I might be in better shape, but I doubt it. It would also have likely been a much less enjoyable and productive experience, living like that.

For cleaner/defluxer/degreaser, I have found that solvent blends are often more effective than a single solvent full strength. Water (as a solvent with tri sodium phosphate surfactant) plus orange oil plus alcohol plus MEK in various combinations can be pretty amazing. To make an excellent defluxer, you usually don't need more than about 30% MEK to get it done and can have as much as 50% water. The MEK, alcohol and, to a lesser extent, orange oil, are the most aggressive parts of the mix but without the water and TSP, the MEK and alcohol quickly dissipate and the gunk redeposits. The water with TSP float it up to where its relatively easy to mop up with absorbent towel or even just wash off in running water, if that's practical.

Thomas Garson
Aural Technology, Ashland, OR
By my calculation, the dynamic range of the universe is roughly 679dB,
which is approximately 225 bits, collected at a rate 1.714287514x10^23 sps.