The safety number of the canvas refers to the weaving density of the warp and weft yarns of the canvas, which indicates the roughness of the fabric texture. The greater the safety number, the greater the weight of the fabric, the rougher the surface, and the greater the texture. The smaller the safety number, the lighter the weight of the fabric, the smoother the surface, and the finer the texture. The weight of the canvas refers to the weight of one square meter of fabric, which means the thickness of the canvas. The greater the weight, the greater the thickness. Therefore, the greater the safety number of the canvas, the higher the warp and weft yarn weaving density of the fabric. The higher the yarn weaving density, the higher the damage, and the thickness and wear resistance of the fabric will naturally increase.

Currently, the commonly used canvas fabrics on the market are generally 6A, 8A, 10A, 12A, 14A, 16A, 18A, 20A, 22A, and 24A. If it is sorted according to the weight of the fabric and the roughness of the surface texture, 6A<8A<10A<12A<14A<16A<18A<20A<22A<24A OEM ODM Backpack Manufacturer, according to the canvas surface In terms of delicacy and smoothness, it is 6A>8A>10A>12A>14A>18A > 20A > 22A > 24A. The greater the amperage of the canvas fabric, the better the durability and wear resistance of the fabric. Of course, the price of the canvas fabric with a larger amperage is slightly higher than that of a smaller ampere. Some simple canvas shopping bags that are more common in daily life are made of low-ampere canvas such as 6 amps, 8 amps, and 10 amps. Like some canvas tool bags, the requirements for the strength and wear resistance of the fabric are relatively high, so the selected canvas is generally made of canvas fabric with an ampere of 14 amperes or above.