Occurs when sizing materials are added to the water suspension of pulp fibers in the papermaking process. Also known as Beater, or Engine sizing.Also known as ISO sizes are widely used in metric countries. ISO standards are based on a rectangle whose sides have a ratio of one to the square root of 2 (1.414). No matter how many times a sheet of these proportions is halved, each will retain the same constant proportions. There are three ISO series A, B, and C.The A Series: The A series is for general printed matter including stationary and publications.
SIZE Millimeters
4A0 1682 x 2378
2A0 1189 x 1682
A0 841 x 1189
A1 594 x 841
A2 420 x 594
A3 297 x 420
A4 210 x 297
A5 148 x 210
A6 105 x 148
A7 74 x 105
A8 52 x 74
The B series: The B series is about half way between two A sizes. It is intended as an alternative to the A series, used primarily for posters and wall charts.
SIZE Millimeter
B0 1000 x 1414
B1 707 x 1000
B2 500 x 707
B3 353 x 500
B4 250 X 353
B5 176 x 250
B6 125 x 176
B7 88 x 125
B8 62 x 88
B9 44 x 44
B10 31 x 44
The C series: The C series is used for folders, post cards and envelopes. C series envelope is suitable to insert A series sizes.
SIZE Millimeter
C0 917 x 1297
C1 648 x 917
C2 458 x 648
C3 324 x 458
C4 229 x 324
C5 162 x 229
C6 114 x 162
C7 81 x 114
C8 57 x 81RA
Series Formats
RA0 860 x 1220
RA1 610 x 860
RA2 430 x 610
RA3 305 x 430
RA4 215 x 305
SRA Series Formats
SRA0 900 x 1280
SRA1 640 x 900
SRA2 450 x 640
SRA3 320 x 450
SRA4 225 x 320
Envelopes
DL 110 x 220
C6 114 x 162
C5 162 x 229
C4 229 x 458
C3 324 x 458