Classification
Duck is classified according to weight in a numerical system, with grade 1 the heaviest and grade 12 the lightest variety. Besides this, traditional names exist, which are rarely used today.
A numbering system is used to describe the various weights of duck cloth, based on the weight of a 36×22-inch piece. Weights below 19 ounces are called numbered duck. The grade of numbered duck refers to the number of ounces subtracted from 19 for a 36×22-inch piece of fabric. For example, a piece of #8 numbered duck with dimensions of 36"×22" weighs 11 ounces (19 − 8 = 11); those above 19 ounces are called naught duck.
Numbered duck is nominally made in weights from 1 to 12, but numbers 7, 9, and 11 are no longer used. Some typical uses of various grades (with weights in ounces) are:
- #1 (18 oz): hammocks, cots, sandbags
- #2 (17 oz): hatch paulins
- #3 (16 oz): heavy-duty bags
- #4 (15 oz): sea bags
- #5 (14 oz): heavy work clothes
- #6 (13 oz): large boat covers, heavy work clothes
- #8 (11 oz): work clothes, clothes bags
- #10 (9 oz): work clothes, shower curtains
- #12 (7 oz): light clothes
Read more about this topic: Cotton Duck