What are the main components of silk fiber?

What are the main components of silk fiber? The main component of silk fiber is protein, and the protein content accounts for 97.34%. In addition, there are 1.40% moisture, 1.14% ash, 0.26% ether-soluble extract, and 0.39% fiber. In raw silk, silk fibroin accounts for about 70%, and sericin accounts for about 22%.
Silk is a continuous long fiber that solidifies from the silk fluid secreted by cooked silkworms when they form cocoons. It is also called natural silk. It is a kind of natural fiber. The main component is protein. The burning speed is very fast, and it appears loose gray after burning. The stretching force of good-quality silk is also very good. The longer the silk is stretched, the better the quality.
For the textile industry, the fiber raw materials used for textiles include cotton, wool, cashmere, silk, ramie, flax, hemp and other natural fibers. Among them, silk is a continuous long fiber formed by the solidification of silk fluid secreted by mature silkworms when they form cocoons, also known as "natural silk". Like wool, it is one of the earliest animal fibers used by human beings.

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