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

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