About the yarn of socks

Textiles can be roughly divided into the following categories: a: plant fiber; b: animal fiber; c: chemical fiber; and regenerated fiber.
Plants include cotton and hemp. Kapok, etc.
Animals include: wool, rabbit hair, camel hair, silk, etc.
Chemical fiber category includes: polyester, polypropylene, acrylic, nylon, etc.
Synthetic fiber refers to the combination of two raw materials, including cotton fiber, cotton fiber, wool fiber, cotton fiber, etc.
E. Characteristics of raw material combustion of socks:
Cotton: it burns immediately after contacting the fire, and continues to burn after leaving the fire, with the smell of burning paper, and a small amount of gray white.
Wool material: It burns slowly after being ignited, and sometimes goes out after leaving the fire. It has a bad smell and is in the form of gray powder.
Brocade cotton material: it melts and contracts when exposed to the fire, burns slowly, and extinguishes itself after leaving the fire. It has a special smell, and is loose and crisp black ash.
Polyester material: close to the flame melting and shrinking, slowly burning, leaving the flame to continue burning, fragrant odor, very hard black beads.
Acrylic material: it is close to the melting and contraction of flame, and it emits black smoke when burning. It has a peculiar odor, and it is hard and shapeless.