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John Goerger wrote: > > 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. John: Thanks for the explanation. It has been over 20 years since I had my own printing business and these memories seem to fade away just like some inks. Jim Davis www.visual-artists.com/paper - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.
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