Paper/Envelope Sizes – Grammes to Microns – Storage

See below a range of common paper sizes, an explanation of gsm and microns and advice on paper storage.

Paper Sizes

 A Sizes                           SRA Sizes                             Envelope Sizes

A0  - 1189mm x 841mm    SRA0  - 1280mm x 900mm    C3   – 457mm x 324mm
A1  - 841mm x 594mm    SRA1  - 900mm x 640mm    C4  - 324mm x 229mm
A2  - 594mm x 420mm    SRA2  - 640mm x 450mm    C5  - 229mm x 162mm
A3  - 420mm x 297mm    SRA3  - 450mm x 320mm    C6  - 162mm x 114mm
A4  - 297mm x 210mm    SRA4  - 320mm x 225mm    DL  - 220mm x 110mm
A5  - 210mm x 148mm
A6  - 148mm x 105mm
A7  - 105mm x 74mm
A8  - 74mm x 52mm

 

 

 

 

 

GSM and Microns
Board thickness or caliper is measured in microns (1000 microns = 1mm).  Most of the time boards are refered to by weight in gsm (grams per square metre).  A few different board weights are shown below along with their thickness in microns.

160gsm = 200 microns
180gsm = 230 microns
240gsm = 300 microns
270gsm = 350 microns
290gsm = 380 microns
385gsm = 500 microns

Storage
Paper is liable to be affected by variations in temperature and humidity.  The optimum storage conditions are a temperature of 16ºC – 22ºC and relative humidity (the moisture content of the air) of 40% – 60%.  Variations in humidity are the most serious and can, by changing the moisture content of the stationery, permanently damage it.

Stationery transferred from a cold room to a warm room can experience a temporary warp.  Sufficient time should be allowed for it to become acclimatised before being used.

All printed stationery should be kept in the original boxes until required for use.  The boxes should be stored lid uppermost and should not be stacked more than five high.  Any partly used box should be placed as the top box.

Stationery should not be stored directly touching the floor and should be kept away from pipes, radiators, hot air ducts, windows or such like.

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