specifics in Rogers Sanders DIY ESL book, need some clarification

[thadman]

I have Roger Sanders "Electrostatic Loudspeaker Design Cookbook" and im a little bit confused with some of the terms he uses in the book.

He mentions 1/2 mil and 1/4 mil mylar (the latter having incredible tensile strength, but unavailable at the moment). Does he mean millimeter? If so, thats 500 microns. I googled 1/4 mil to microns, and got 6.35 microns...hmm He mentions that 1/4 mil was the thinnest and strongest mylar that dupont ever produced, but im also positive that 3.8 micron film is available and is used quite often. So what abbreviation is *mil* for?

[gitarretyp]

1 mil = 1/1000 of an inch.

[thadman]

nvm I believe hes referring to the *thou* which is 25.4 microns

[wkhanna]

1 mil = 1/1000 of an inch.

FWIW:

1/1000 inch = .001 inch

1/2 mill = .0005 inch

1/4 mill = .00025 inch