D646-13 – Standard Test Method Technical Guide

⚖️ Scope and Significance of Basis Weight Testing

ASTM D646 – 13 establishes the standardized procedure for determining the mass per unit area, or basis weight, of paper and paperboard, including aramid papers. In accordance with SI metric standards, the results are explicitly expressed in grams per square meter (g/m²). This standard is essential for commercial transactions, as most paper products are bought and sold based on this fundamental property. Furthermore, the interpretation of key physical properties such as bursting strength, thickness, and bulk is directly reliant on the specific mass per unit area of the material.

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