Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
The standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee on Leather of Standardization Administration of China (SAC/TC 252).
This standard is issued as first edition.
Case and Bag Leather
1 Scope
This standard specifies the requirements, grading, test methods, inspection rules, acceptance, packaging, marking, transportation and storage of case and bag leather.
This standard is applicable to various case and bag leathers (excluding transfer coating leather).
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 19941 Leather and Fur - Chemical Tests - Determination of Formaldehyde Content
GB/T 19942 Leather and Fur - Chemical Tests - Determination of Banned Azo Colourants
GB/T 22886 Leather - Tests for Colour Fastness - Colour Fastness to Water Spotting
GB/T 22889 Leather - Physical and Mechanical Tests - Determination of Surface Coating Thickness
GB/T 30398 Leather and Fur - Chemical Tests - Determination of Allergenic Disperse Dyestuffs
GB/T 30399 Leather and Fur - Chemical Tests - Determination of Carcinogenic Dyestuffs
QB/T 2537 Leather - Tests for Colour Fastness - Colour Fastness to Cycles of To-and-fro Rubbing
QB/T 2710 Leather - Physical and Mechanical Tests - Determination of Tensile Strength and Percentage Extension
QB/T 2714 Leather - Physical and Mechanical Tests - Determination of Flex Resistance
QB/T 2724 Leather - Chemical Test - Determination of pH
QB/T 2725 Leather - Determination of Odour
QB/T 2727-2017 Leather - Tests for Color Fastness. Color Fastness to Artificial Light: Xenon Art Fading Lamp Test
QB/T 2801 Leather - The Rules of Examination for Acceptance Packing Marking Transportation and Conservation
QB/T 4198 Leather - Physical and Mechanical Tests - Determination of Tear Load: Single Edge Tear
3 Requirements
3.1 Physical and chemical properties
It shall meet the requirements specified in Table 1.
Table 1 Physical and Chemical Properties
Item Index
Tear load/N ≥ 15
Elongation under the specified load/% (specified load 10N/mm2) ≤ 60
Folding fastness of coating Free of crack after folding for 10000 times
Odor/grade ≤ 3
pH 3.5~6.0
Diluted difference of pH (when pH value is less than 4.0, inspect the diluted difference) ≤ 0.7
Decomposable harmful aromatic amine dyes/(mg/kg) ≤ 30
Carcinogenic dyes/(mg/kg) ≤ 30
Allergenous disperse dyes/(mg/kg) ≤ 30
Free formaldehyde/(mg/kg) ≤ 150
3.2 Color fastness
It shall meet the requirements specified in Table 2.
Table 2 Color Fastness
Item Category
No-finishing and light-finishing leather Heavy-finishing leather Suede leather
Coating thickness/μm ≤20 >20 -
Color fastness to rubbing /grade Dry rubbing ≥ 3 3/4 3
Wet rubbing ≥ 2/3 3 2
Color fastness to light /grade ≥ 3 4 3
Color fastness to water stain /grade ≥ 3 (except suede leather)
3.3 Sensory requirements
3.3.1 The whole piece of leather has basically uniform thickness, the leather is flat and free of greasy feeling; soft leather is soft, plump and elastic.
3.3.2 There are no broken grain and pipey and the primary parts shall be free from loose grain.
3.3.3 The finishing of finished leather is uniform, the coating is in firm adhesion and free of decoating and crazing. The fluff of suede leather is uniform and the color is basically consistent.
4 Grading
After the product passes the inspection, the grading is carried out according to the proportion of available area for whole piece of leather and shall meet the requirements specified in Table 3.
Table 3 Grading
Item Grade
Grade I Grade II Grade III Grade IV
Available area/% ≥ 90 80 70 60
Major positions of whole piece of leather (leather center, hip and back) Free of defect influencing the use function -
Minor defect/% ≤ 5
Note: minor defect: defect that have no influence on the inherent quality and use of the product, but may slightly influence the appearance such as slight dyeing defect, roughness on the leather surface and non-uniform color.
5 Test Methods
5.1 Tear load
Inspect according to QB/T 4198.
5.2 Elongation under the specified load
Inspect according to QB/T 2710.
5.3 Folding fastness of coating
Inspect according to QB/T 2714.
5.4 Odor
Inspect according to QB/T 2725.
5.5 pH value and diluted difference
Inspect according to QB/T 2724.
5.6 Decomposable harmful aromatic amine dyes
Inspect according to GB/T 19942.
5.7 Carcinogenic dyes
Inspect according to GB/T 30399.
5.8 Allergenous disperse dyes
Inspect according to GB/T 30398.
5.9 Free formaldehyde
Inspect according to GB/T 19941. In case dispute occurs and arbitration inspection is carried out, the chromatography shall prevail.
Foreword i
1 Scope
2 Normative References
3 Requirements
4 Grading
5 Test Methods
6 Inspection Rules
7 Acceptance, Marking, Packaging, Transportation and Storage
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
The standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee on Leather of Standardization Administration of China (SAC/TC 252).
This standard is issued as first edition.
Case and Bag Leather
1 Scope
This standard specifies the requirements, grading, test methods, inspection rules, acceptance, packaging, marking, transportation and storage of case and bag leather.
This standard is applicable to various case and bag leathers (excluding transfer coating leather).
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 19941 Leather and Fur - Chemical Tests - Determination of Formaldehyde Content
GB/T 19942 Leather and Fur - Chemical Tests - Determination of Banned Azo Colourants
GB/T 22886 Leather - Tests for Colour Fastness - Colour Fastness to Water Spotting
GB/T 22889 Leather - Physical and Mechanical Tests - Determination of Surface Coating Thickness
GB/T 30398 Leather and Fur - Chemical Tests - Determination of Allergenic Disperse Dyestuffs
GB/T 30399 Leather and Fur - Chemical Tests - Determination of Carcinogenic Dyestuffs
QB/T 2537 Leather - Tests for Colour Fastness - Colour Fastness to Cycles of To-and-fro Rubbing
QB/T 2710 Leather - Physical and Mechanical Tests - Determination of Tensile Strength and Percentage Extension
QB/T 2714 Leather - Physical and Mechanical Tests - Determination of Flex Resistance
QB/T 2724 Leather - Chemical Test - Determination of pH
QB/T 2725 Leather - Determination of Odour
QB/T 2727-2017 Leather - Tests for Color Fastness. Color Fastness to Artificial Light: Xenon Art Fading Lamp Test
QB/T 2801 Leather - The Rules of Examination for Acceptance Packing Marking Transportation and Conservation
QB/T 4198 Leather - Physical and Mechanical Tests - Determination of Tear Load: Single Edge Tear
3 Requirements
3.1 Physical and chemical properties
It shall meet the requirements specified in Table 1.
Table 1 Physical and Chemical Properties
Item Index
Tear load/N ≥ 15
Elongation under the specified load/% (specified load 10N/mm2) ≤ 60
Folding fastness of coating Free of crack after folding for 10000 times
Odor/grade ≤ 3
pH 3.5~6.0
Diluted difference of pH (when pH value is less than 4.0, inspect the diluted difference) ≤ 0.7
Decomposable harmful aromatic amine dyes/(mg/kg) ≤ 30
Carcinogenic dyes/(mg/kg) ≤ 30
Allergenous disperse dyes/(mg/kg) ≤ 30
Free formaldehyde/(mg/kg) ≤ 150
3.2 Color fastness
It shall meet the requirements specified in Table 2.
Table 2 Color Fastness
Item Category
No-finishing and light-finishing leather Heavy-finishing leather Suede leather
Coating thickness/μm ≤20 >20 -
Color fastness to rubbing /grade Dry rubbing ≥ 3 3/4 3
Wet rubbing ≥ 2/3 3 2
Color fastness to light /grade ≥ 3 4 3
Color fastness to water stain /grade ≥ 3 (except suede leather)
3.3 Sensory requirements
3.3.1 The whole piece of leather has basically uniform thickness, the leather is flat and free of greasy feeling; soft leather is soft, plump and elastic.
3.3.2 There are no broken grain and pipey and the primary parts shall be free from loose grain.
3.3.3 The finishing of finished leather is uniform, the coating is in firm adhesion and free of decoating and crazing. The fluff of suede leather is uniform and the color is basically consistent.
4 Grading
After the product passes the inspection, the grading is carried out according to the proportion of available area for whole piece of leather and shall meet the requirements specified in Table 3.
Table 3 Grading
Item Grade
Grade I Grade II Grade III Grade IV
Available area/% ≥ 90 80 70 60
Major positions of whole piece of leather (leather center, hip and back) Free of defect influencing the use function -
Minor defect/% ≤ 5
Note: minor defect: defect that have no influence on the inherent quality and use of the product, but may slightly influence the appearance such as slight dyeing defect, roughness on the leather surface and non-uniform color.
5 Test Methods
5.1 Tear load
Inspect according to QB/T 4198.
5.2 Elongation under the specified load
Inspect according to QB/T 2710.
5.3 Folding fastness of coating
Inspect according to QB/T 2714.
5.4 Odor
Inspect according to QB/T 2725.
5.5 pH value and diluted difference
Inspect according to QB/T 2724.
5.6 Decomposable harmful aromatic amine dyes
Inspect according to GB/T 19942.
5.7 Carcinogenic dyes
Inspect according to GB/T 30399.
5.8 Allergenous disperse dyes
Inspect according to GB/T 30398.
5.9 Free formaldehyde
Inspect according to GB/T 19941. In case dispute occurs and arbitration inspection is carried out, the chromatography shall prevail.
Contents of QB/T 5087-2017
Foreword i
1 Scope
2 Normative References
3 Requirements
4 Grading
5 Test Methods
6 Inspection Rules
7 Acceptance, Marking, Packaging, Transportation and Storage
