I'm expert in touch. I feel like meat. Layman, press by hand, there are wrinkles, leather material is not thick, is the real cowhide, that is, the first layer of skin, and vice versa is the second layer of skin
In terms of format size, the first layer skin basically retains the whole area of wet blue skin, and the width area of the skin material is larger, and the skin surface is symmetrical. For the second skin, there will be greater loss when dissecting the first skin, the skin area will be much smaller than the first skin, and there will be more disabled parts.
Tear resistance. According to the requirements of the vehicle manufacturer, the tear resistance of leather is 40 kg / cm2. Specifically, after a small cut in the second skin, adults can easily tear it. The first layer of cattle hide cut a small mouth, adults also have to work hard to tear.
There are nipple layer in the top layer of the road, which has natural granular surface and pores. If you press it down with your hand, natural leather wrinkles will stretch. Although the second layer of leather has artificial lines, it has no pores. If you press it down with your hand, the wrinkles of the leather like coating or peritoneum will not shrink. "
The higher the grade of the head leather, the thinner the leather. The best head leather is as thin as paper. The second layer of cow leather is the thickest, because the second layer of cow leather is the first layer of leather. Polyethylene material is added after breaking. If the leather surface is broken, it will be broken before production. Therefore, the leather surface is thicker and cannot be polished in the production process. If it is polished, the upper will break after use. If the leather is not polished, it is easy to open the glue. Therefore, the leather shoes of the second layer of cow leather are made by machinery, without glue, No glue smell.
Leather shoes with the top layer of cowhide will be polished during production to make the glue more firm. If they are glued, they will naturally have the smell of glue. The first layer of cowhide is the skin of the cow. The cow has only one color, and the gloss is not as bright as the second layer of cowhide (i.e. fake cowhide). Therefore, after production, polishing agent will be sprayed, so there will be a smell of oil.