Canvas is an extremely durable plain-woven fabric used for making sails, tents, marquees, backpacks, and other items for which sturdiness is required. It is also popularly used by artists as a painting surface, typically stretched across a wooden frame. It is also used in such fashion objects as handbags, electronic device cases, and shoes.
Generally, plain weave is used and a few twill weaves are used. Warp and weft use multiple strands. "English system" means that one pound (454 g) of cotton yarn (or other component thread) has a length of 840 yards (0.9144 yards / meter). The yarn fineness is 1. If there is a pound of yarn, its length is 10 × 840 yards, its fineness is 10, the expression of the English support symbol is "S" single yarn notation: 32 single yarn - 32 S chain Both 32 strands (double strands) are: 32 S / 2, 42 strands and 3 strands are both: 42 S / 3. Canvas is used to make labor protection clothing and supplies.