Pound rating of paper is applicable to what ?

Question

For example, 20# paper means exactly what ? that a case weighs 20 pounds ? or what ?

Answer 1

20 lbs for 500 sheets of 17"x22"

500 sheets
We generally use paper in 8.5" x 11" finished sizes, it is the basis size that determines the basis weight. These are the most commonly used ‘basis sizes’:
Bond, Writing, Stationery, Ledger 17" x 22"
Cover 20" x 26"
Book, Text, Offset, Coated 25" x 38"
Index 25.5" x 30.5"
Vellum Bristol Cover 22.5" x 28.5"
Tag 24" x 36"

Answer 2

The basis weight of paper is the density of paper expressed in terms of the mass of a ream of given dimensions and a sheet count. This mass is specified in avoirdupois pounds and the sheet count of a paper ream is usually 500 sheets.

For example, "20#" means "20 pounds per basis ream of 500 sheets". (for that sheet size... obviously the weight of 500 sheets of a different-sized sheet will also be different).

So basically you need to know 3 things: length, width, and mass for 500 sheets.

Answer 3

It is the weight of a standard ream (500 sheets) of paper.
Some paper is thicker than others and the weight is expressed in pounds (per ream). In your example, that would be 20 lbs.

Answer 4

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Answer 5

For the layman (users) its a measure of thickness, but I'm sure it has a relationship to the weight of a certain amount or volume.

Answer 6

Civilised countries measure the density of paper by "gsm" - grams per square metre. Ordinary photocopier or printer paper is usually 80 gsm. A square metre weighs 80 g.