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Identification of materials:

1. Cowhide has small and tight pores, fine grain surface, plump leather body and good fastness.

2. The grain lines on goatskin are semi-circular, and tile-shaped grain lines are formed by 2-4 larger pores on the circular arc. The grain is clear, the three-dimensional sense is strong, and the leather surface is slightly rough. Leather is strong and durable.

3. The grain surface characteristics of sheep leather are similar to those of goat leather, but the three-dimensional sense of grain surface is weak, and the grain surface of leather is more delicate, soft and malleable than goat leather.

4. Pigskin is characterized by large pores, forming a set of unique three-hole triangular lines. Leather is flexible, more wear-resistant and cheaper than cowhide.

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Visual inspection:

1. Be sure to identify the trademark, specification, name and address of the manufacturer of leather clothes, and don't buy products without registered trademarks and manufacturers. Ask for an invoice and warranty card when purchasing.

2. Leather clothing should not be discolored, cracked or pulped, and the feel should be plump and elastic. The whole garment should be the same color, five colors, colorful flowers, smooth leather surface and meticulous grain surface.

3. Touch, smell and see. "Touch" should be soft, plump and elastic; "Smell" should be odorless and tasteless. "Look" depends on whether the whole dress is too thin, loose, shelled and peeled (the secondary parts can be loose and rough). Generally, only three or four pigs or five or six sheep are needed to make a leather coat, and the overall effect is good. The thickness, thickness and color should be properly matched, and the smaller the difference between primary and secondary parts, the better.

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Observe color

Select the secondary parts of leather clothing, such as the back of the collar, the inside of the clothes or the skirt, dip absorbent cotton in water and squeeze it dry by hand. Select a 250px long part on the leather coat and rub it back and forth with wet absorbent cotton for 20 times to see if the absorbent cotton is stained. If the dyeing color is heavy, black or dark gray, it is unqualified. According to the laboratory inspection, the general wet rubbing grade of leather is required to be Grade III (refer to the colorimetric standard card of leather inspection station). Let's take a look at the situation of the cracked surface falling off. Rub your hands for two or three minutes. After stretching, observe whether there are cracks and slag on the leather surface. If cracks and slag fall, it is unqualified. You can also lift the leather surface from the inside with your fingers and rub it several times at the same time to lift part of the leather surface. If the surface coating falls off, it is pulp dropping, indicating that the coating is not firm. Finally, look at the strength of leather itself. The most important index of leather strength is tear strength. When doing experiments in the laboratory, a diamond-shaped incision was made in the leather, and then two hooks were hung on the tension machine to see whether the incision continued to tear under a certain tension (chrome pigskin garment leather was 30N/cm, while other garment leather was 20N/cm). Visual inspection can be based on this principle, cut a small mouth in the secondary part of the leather coat and gently break it open by hand. If the cut part is deformed, the tear strength is not enough. You can also pull the joint with moderate strength, and if there is a tearing trend, it is unqualified; You can also let your fingers dig hard at the top leather surface from the inside. If there are cracks and cracks, it is unqualified.

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Work inspection

There should be a straight front placket, symmetrical left and right, and correct buttons. The sleeves are long, the armholes are round and smooth, and the sleeves are not twisted. Back splicing, flat sewing. The lining of clothes should fit well, not too loose or too tight. Clothing sewing mostly uses polyester thread or silk thread, and jumpers and broken wires are not allowed. The number of stitches in the 30mm long seam of natural leather clothing is 8- 14, and the spacing is equal. The smaller the diameter of the sewing needle, the higher the seam strength. High-quality leather accessories have high quality requirements. The lining is made of high quality silk. Zippers and buttons are also made of high quality copper. A high-quality leather coat gives people the feeling that it is soft, smooth and elastic, and the wrinkles pressed by hand can disappear quickly. The thickness of leather in all parts of the clothing is uniform, and it is comfortable, flat and crisp to wear. Not hard or soft.