What does the number designation of canvas indicate?

The number designation of canvas primarily refers to its weight in ounces per square yard. This is a standard measurement used in the textile industry to provide a guideline for the thickness and durability of the fabric. For example, a canvas that is designated as 10-ounce would weigh 10 ounces for a square yard of material. The weight of the fabric is crucial for understanding its application; heavier canvas is typically more durable and suited for heavy-duty use, such as in sails or tarps, whereas lighter canvas may be used for items like tents or lighter-duty applications.

Understanding this weight classification helps individuals select the right type of canvas for their specific needs, ensuring the material will perform effectively in its intended use. The other options, while they cover different aspects of fabric quality or specifications, do not accurately represent what the number designation on canvas indicates.