Back Quadratmetergewicht German Επιφανειακή πυκνότητα χαρτιού Greek Gramaje Spanish گرماژ Persian Grammage French גרם למטר רבוע HE Gramatura Croatian Gramatur ID Grammatura Italian Gramatura papieru Polish
Grammage and basis weight, in the pulp and paper industry, are the area density of a paper product, that is, its mass per unit of area. Two ways of expressing grammage are commonly used:
- Expressed in grams (g) per square metre (g/m2), regardless of its thickness (caliper).[1] This is the measure used in most parts of the world. It is often notated as gsm on paper product labels and spec sheets.
- Expressed in terms of the mass per number of sheets of a specific paper size, known as basis weight. The convention used in the United States and a few other countries using US-standard paper sizes is pounds (lb) per a ream of 500 (or in some cases 1000) sheets of a given (raw, still uncut) basis size. Japanese paper is expressed as the weight in kilograms (kg) per 1,000 sheets.
- ^ International Standard ISO 536: Paper and board – Determination of grammage. International Organization for Standardization, Geneva.