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Bruce Roorda wrote: > > Bill Cameron's post raises a question I'll bet someone on the list > can answer: Is there a reference on the web that clearly explains > paper thickness specifications? > > John Goerger's post is helpful, but as I understand it, not all > paper "weights" are based on the same size sheet, and it seems > that actual thickness could vary with the density of the paper for > two papers of the same weight. > > And what does "gsm" specify (e.g. "250gsm" in post from J. Arthur > Davis)? Media thickness is most commonly measured in mils or points, however the thickness has no bearing on weight. I very dense media like film that is 4mils thick would weigh much more than a 4mil thick piece of tissue paper. Your right about weights, there are 5 "weights" in pounds that are commonly used, as well as other less commom weights, with each one having a different basis weight. They are; BOND 17"x22"x500 sheets TEXT 25"x38"x500 sheets COVER 20"x26"x500 sheets BRISTOL 22.5"x28.5"x500 sheets INDEX 25.5"x30.5"x500 sheets Gsm is the way most people specify "grams per square meter" in emails. It is a little difficult if not impossible with some email programs to insert a super script 2, as in gmsÓ, I'm not even sure if that is the right way to type it, Its been so long since I've used it. Most Inkjet Coaters use the BOND measurment when specifying a weight in pounds. This is beacause, like us, most of them were or still are diazo coaters. Diazo (blueprint) paper uses the bond basis, so most of us stuck with the bond weight basis. IMHO gsm is far superior because it is constant, a gram is a gram is a gram and a meter is a meter is a meter. John Goerger www.weber-valentine.com Toll Free 1-800-323-9642 USA ONLY 1-847-439-7111 Fax: 1-847-439-6887 - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.