Paper sizes according to ISO

Today we tell about the paper sizes.Their story begins with the end of the XVIII-th century.In 1798 the German writer and scientist Dr. Georg Christoph Lichtenberg, in his letter to Johann Beckmann explains the practical and aesthetic aspect ratio equal to the square root of 2.

A few years later the French government introduces a law on the taxation of paper merchants, indicating the size of it, has exactlycorresponding to modern formats ISO."Grand register" - is ISO A2, "Grand papier" - ISO B3 and so on.French formats never became popular and were forgotten about for a hundred years.

In 1922 in Germany, with a view of economy and efficiency are introduced standard DIN 406. This concept was so convincing that many European and Asian countries are taking German as a national standard.But since 1975 all the official documents of the United Nations was introduced it sheet sizes.

exception is North America, it is US and Canada, as well as Japan.

according to ISO paper originally divided into three main classes.The basis taken a leaf area per square meter.That size corresponds to A0 format.Assumed width and length in millimeters.As a general rule all other paper sizes are determined by dividing the longest two sides, ie, if A0 (841x1189) cut in half, we get 594h841.This will A1 format, etc.

For background information will carry all class sizes in the table.

class in Russia is the most popular.And it is considered the most popular A4 format.It is used daily in millions of offices.

But mass production in Europe can not rely on any particular format.The reason is that more and more used printing equipment that can work universally satisfying consumer demand.That is why there are Class B paper sizes are defined as the geometric mean it between neighboring class B1 A. That is the geometric mean between A1 and A0.And the format is similar to the C-Class - is the geometric mean between the formats A and B of the same number.That is a letter written on a sheet of A4, perfectly located in the envelope size C4 and A5 sheet without problems lies in an envelope C5.

All of these formats are edging that is itsheet sizes of finished publications.

On the pages of search engines is often confusion with the format and quality.Classes A, B, and C in any case should not be confused with the categories of paper A, A +, B, B +, C, C + - and vice versa.In the first case - the size in the second - grade and properties.The above categories define the quality of the paper on certain parameters, such as density, whiteness, humidity curl, conductivity, smoothness, roughness, thickness, stiffness.Accordingly, the categories determined by the quality, that is paper-luxury category - A price-performance ratio - In the category of paper, paper economy class - S.