Do you often see “300D nylon”, “600D Codura”, “1680D oxford”…on the description card when you choose a backpack? What’s the meaning of the “D”? Most people may regard “D” as “density” or its weight, is that true?
If you are those people who know customized backpacks, you must know “D” is the unit of measurement for fiber. Searching “D” in Encyclopedia, “D” is the abbreviation of “denier”, a unit of fineness, also known as “denier number”, which is the weight in grams of 9000 meters of filament. For example, 600D means that the weight of 9000 meters of filament is 600 grams. While 9000 is a standard, but if the length is not 9000 meters? How to calculate? The formula is as below picture:
Item No.: SK61004A
Durable and water-resistant
Fits up for a 15” laptop
Roll-top closure design
Breathable padded back panel
Is it clear?
Let’s connect with our life and image what’s the fiber of the fabric looks like? The same designed T-shirt, which has a different thickness. Generally speaking, D is a reference to the thickness of backpacks. From the appearance, the bigger D, the thicker silk, the thicker backpack; While the smaller D, the lighter silk, so the backpack is lighter, thinner. For example, a 210D fabric, which has a very fine organization, and generally used as the lining or layer of the backpacks. And fabrics with 900D or 1000D are thicker, abrasion-resistant, more suitable for the bottom of the backpacks.