QB 1873-1993 Leather for upper QB1873-1993 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Leather for shoe uppers
Subject content and scope of application
QB 18731993
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of leather for shoe uppers. This standard applies to leathers for leather uppers made of pig, cattle, sheep and other animal skins, using various processes and various agents (such as chromium and various combinations, etc.). 2
Referenced standards
GB/T4689 Test methods for physical and chemical properties of finished leather products Determination of thickness of finished leather products
GB/T4691
GB/T4694 Packaging, marking, transportation and storage of finished leather products Test method for friction fastness of leather surface color QB/T 1327
3 Product classification
See Table 1 for product classification.
Thickness, mm
4 Technical requirements
Cow, horse and cow leather
4.1 The thickness error between the back leather and the standard point shall not exceed ±10%. Physical and chemical indicators shall meet the requirements of Table 2.
Pig leather
Tensile strength, MPa
Tear strength, N/mm
Elongation under 10N load, %
Coating folding fastness
Color rubbing fastnessbzxZ.net
Shrinkage temperature, ℃
Dilution difference)
Dry/wet, grade
Note: 1) This item shall be tested when the pH value is 3.5~4.0. Approved by the Ministry of Light Industry of the People's Republic of China on November 13, 1993 382
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Sheep Leather
Other Leather
No cracks on the front side for 20,000 times, no cracks on the face for 2,000 times 4.0/3.0
90 (The shrinkage temperature of leather for vulcanized shoe uppers should be greater than 100°C) 3.5~6.0
1994-07-01 Implementation
Text Standard Service
4.3 Appearance Requirements
QB1873-
4.3.1 The thickness of the whole leather is basically even, without peculiar smell or greasy feeling. 4.3.2 The leather body should be plump, soft and elastic. No cracks or wrinkles, and the main parts should not be loose. 4.3.3 The coating of the finished leather should be even and firm, and the nap of the suede leather should be even and the color should be basically consistent. 5 Test methods
5.1 Air conditioning
The sample shall be air-conditioned according to GB/T4689.2. 5.2 Finished product thickness
Measured according to GB/T4691.
5.3 Physical and chemical performance tests
5.3.1 Color fastness to rubbing: Tested according to QB/T1327. 5.3.2 Other items shall be tested according to GB/T4689. 5.4 Appearance inspection
Inspect by sense organs at a clear viewing distance under natural light. 6 Inspection rules
6.1 Batch
Products of the same variety produced by the same batch of raw materials and the same production process constitute an inspection batch. 6.2 Factory Inspection
6.2.1 Products must be inspected before leaving the factory. They can only leave the factory after passing the inspection and accompanied by a certificate of conformity. 6. 2.2 Inspection items: appearance inspection, coating folding fastness. 6.2.2.1 Appearance inspection: Inspect each sheet (piece) according to the provisions of Article 4.3. 6.2.2.2 Coating folding fastness: Randomly select 3 sheets (pieces) from all qualified products in the appearance inspection and conduct the inspection according to the provisions of 5.3.2. 6.2.3 Qualification judgment: The appearance inspection shall all comply with the provisions of Article 4.3. In the coating folding fastness inspection, if only 1 sheet (piece) out of 3 sheets (pieces) does not meet the requirements of coating folding fastness in Table 2, the batch of products shall be judged to be qualified. If 2 sheets (pieces) or more do not meet the requirements of coating folding fastness in Table 2, double sampling shall be taken for re-inspection of the item. If 2 sheets (pieces) or more still do not meet the requirements of the item during the re-inspection, the batch of products shall be judged to be unqualified.
6.3 Type inspection
6.3.1 Type inspection shall be conducted in any of the following cases. When the raw materials, main process or agent are changed; a.
b. When the product is resumed after a long-term suspension: When the national quality and technical supervision agency proposes a requirement for type inspection; c.
In normal production, at least a type test shall be conducted every six months. d.
6.3.2 Sampling quantity: Randomly select 5 sheets (pieces) from the inspected products and conduct all appearance inspections, of which 3 sheets (pieces) shall be tested for physical and chemical properties.
6.3.3 Qualification judgment
6.3.3.1 Principles for judging a single sheet (piece)
If the folding fastness of the coating in Table 2 is unqualified, the sheet (piece) shall be judged as unqualified. If three or more of the other items in the technical requirements are unqualified, the sheet (piece) shall be judged as unqualified.
6.3.3.2 Batch determination principle
If 2 or more samples are unqualified among 5 samples, 10 samples will be doubled for re-test. All 10 samples will be inspected for appearance, and 6 samples will be inspected for physical and chemical properties. If 3 or more samples are unqualified, the batch of products will be judged to be unqualified. 383
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7 Marking, packaging, transportation, storage
QB1873-1993
Marking, packaging, transportation, and storage shall comply with the provisions of GB/T4694. Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Fur Leather Standardization Center. This standard was drafted at the expense of the Leather Research Institute of the Ministry of Light Industry. The main drafter of this standard is Chen Yingyuan.
This standard adopts the Japanese industry standard JISK6551-1977 "Leather for Shoes". From the date of implementation of this standard, the former Ministry of Light Industry standards SG355-1984 "Chrome Pig Genuine Upper Leather", SG356-1984 "Chrome Pig Nubuck Upper Leather", SG357-1984 "Chrome Pig Modified Upper Leather", SG358-1984 "Chrome Yellow Cattle Genuine Upper Leather", SG359-1984 "Yellow Cattle Modified Upper Leather", SG360-1984 "Chrome Goat Genuine Upper Leather", SG361-1984 "Chrome Thorn Goat Suede Upper Leather", and the former professional standard ZBY45003-1988 "Chrome Pig Soft Genuine Upper Leather" shall be invalid. 384
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