QB/T 1873-2023 (QB/T1873-2023, QBT 1873-2023, QBT1873-2023) & related versions
QB/T 1873-2023: PDF in English (QBT 1873-2023)
QB/T 1873‐2010
Translated English of Chinese Standard. QB/T1873‐2010
Wayne Zheng et al.
QB
ICB 59.140.30
Class No.. Y46
Record No.. 31055-2011
INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing QB/T 1873-2004
Shoe upper leather
ISSUED ON. DECEMBER 29, 2010
IMPLEMENTED ON. APRIL 1, 2011
Issued by. Ministry of Industry and Information Technology of the
People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Product classification ... 5
4 Requirements ... 5
5 Grade ... 7
6 Test methods ... 7
7 Inspection rules ... 8
8 Mark, package, transportation and storage ... 9
Foreword
This Standard is a revision of QB/T 1873 - 2004 Shoe Upper Leather.
This standard, in comparison with QB/T 1873-2004, has the major changes as follows.
— Adjust “scope”;
— Add standards for reference in "normative reference documents";
— Adjust the thickness range in "product classification";
— Add requirements for "limit of harmful substances", to be consistent with GB
20400-2006;
— Replace the "tear load" with the "tear load";
— Adjust requirements for "specified load elongation" and "bursting height";
— Adjust and refine the requirements for "coating folding endurance" and "bursting
strength". And add requirements for "split leather";
— Add requirements for "internal surface of unlined shoe upper leather" in "color
fastness to rubbing";
— Add requirements for "odor";
— Add requirements for "shrink temperature" of non-chrome tanning shoe’s upper
leather;
— Simplify the requirements for "ex-factory inspection";
— Modify the "determination rules for single (piece) leather".
This Standard was proposed by China National Light Industry Council.
This Standard shall be centralized by the National Leather Industry Standardization
Technical Committee (SAC/TC 252).
Drafting organization of this Standard. Fengan Leather Co., Ltd.
The main drafters of this Standard. Chen Ronghui, and Chen Rongsheng.
This Standard was first issued in 1993. And this is the second version.
From the date of implementation, this Standard shall replace the previous light industry
standard QB/T 1873-2004 Shoe Upper Leather.
Shoe upper leather
1 Scope
This Standard specifies the products classification, requirements, grading, test methods,
inspection rules, package, mark, transportation and storage of the shoe upper leather.
This Standard applies to all kinds of shoe upper leather. Leather for bags can also refer to
this Standard.
This Standard does not apply to shift membrane leather.
2 Normative references
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(Including all corrections) or revisions made thereafter shall be applicable to this Standard.
GB/T 19941 Leather and fur -- Chemical tests-Determination of formaldehyde
content (GB/T 19941-2005, ISO/TS 17226.2003,MOD)
GB/T 19942 Leather and fur -- Chemical tests -- Determination of banned azo
colourants (GB/T 19942-2005, ISO/TS 17234.2003,MOD)
GB 20400 Leather and fur-Limit of harmful matter
QB/T 2537 Leather -- Tests for colour fastness -- Colour fastness to cycles of
to-and-fro rubbing (QB/T 2537-2001, eqv ISO 11640.1993)
QB/T 2710 Leather -- Physical and mechanical tests -- Determination of tensile
strength and percentage extension (QB/T 2710-2005, MOD ISO 3376.2002)
QB/T 2711 Leather -- Physical and mechanical tests -- Determination of tear load --
Double edge tear (QB/T 2711-2005, MOD ISO 3377-2.2002)
QB/T 2712 Leather -- Physical and mechanical tests -- Determination of distension
and strength of grain -- Ball burst test (QB/T 2712-2005, MOD ISO 3379.2002)
QB/T 2713 Leather -- Physical and mechanical tests -- Determination of shrinkage
temperature (QB/T 2713-2005, MOD ISO 3380.2002)
QB/T 2714 Leather -- Physical and mechanical tests -- Determination of flex
resistance (QB/T 2714-2005, MOD ISO 5402.2002)
QB/T 2724 Leather -- chemical test -- Determination of ph (QB/T 2724-2005, MOD
ISO 4045.1977)
QB/T 2725 Leather -- Determination of odour
QB/T 2801 Leather -- The rules of examination for acceptance packing marking
transportation and conservation
3 Product classification
3.1 See Table 1 for the product classification. And the classification of each type of
leather includes the sectional-layer leather of its kind.
Table 1 Classification
Category Cattle, horse, mule leathers Pig leather Sheep leather Other leathers
Thickness /mm
Type I >1.5 >0.9 >1.5
Type II 1.3-1.5 0.6-0.9 1.0-1.5
Type III < 1.3 < 0.6 < 1.0
4 Requirements
4.1 Limit of harmful substances
It shall comply with provisions indicated in GB 20100 and Table 2.
Table 2 Limit value of harmful substances
Items
Limit value
Class A
(Infants'
product)
Class B
(Products in direct
contact with the skin)
Class C
(Products in indirect
contact with the skin)
Decomposable harmful
aromatic amine dyes
/(mg/kg)
≤30
Free formaldehyde (mg/kg) ≤20 ≤75 ≤300
Note. See GB 20100 for names of banned aromatic amines. If the content of 4-aminobiphenyl and (or)
2-naphthylamine exceeds 30 mg/kg, and there is no other evidence, it still can not be concluded
that the banned azo dye is used, with existing scientific knowledge.
4.2 Physiochemical property indexes
It shall comply with provisions indicated in Table 3.
leather; 500g for suede leather, and internal surface of unlined shoe’s upper leather. 50
times for dry rubbing; and 10 times for wet rubbing.
6.8 Odor
Determine according to the provisions of QB/T 2725.
6.9 Shrink temperature
Determine according to the provisions of QB/T 2713.
6.10 pH and dilution difference
Determine according to the provisions of QB/T 27124.
6.11 Sensory requirements
Under the suitable light, choose the clear sight distance to conduct sensory inspection.
7 Inspection rules
7.1 Batch-group
The products of the same variety, produced by the same type of raw material and same
process shall consist as an inspection batch.
7.2 Ex-factory inspection
Products must be inspected; passing the inspection; and attached with certificate; before
leaving the factory.
7.3 Type inspection
7.3.1 Inspection cycle
Type inspection shall be conducted if there is one of the following conditions.
a) When the raw materials, process or chemical materials have significant changes;
b) When the production is resumed after a long-term shutdown (six months);
c) When the national quality and supervision agency puts forward requirements for
type inspection;
d) During the normal production, type inspection shall be conducted semiannually;
7.3.2 Sampling quantity
Randomly choose 3 sheets (pieces) for inspection from the products passing the
inspection.
7.3.3 Qualified determination
7.3.3.1 Decision rules for single sheet (piece)
— If one of the banned azo dye, free formaldehyde, tear load, coating folding
endurance, bursting height, colour fastness to rubbing and odor is unqualified; or
crack surface, crazing and other defects occurs and affects the use function, then
the sheet (piece) is judged as unqualified;
— If accumulative two items of the specified load elongation, bursting strength, shrink
temperature, pH, and pH dilution difference are unqualified, then the sheet (piece) is
judged as unqualified;
— If one item of the specified load elongation, bursting strength, shrink temperature,
pH, and pH dilution difference is unqualified; and there are accumulative two items
of sensory requirements that are unqualified, the sheet (piece) is judged as
unqualified;
— When the limit of harmful substances and physiochemical property indexes are all
qualified; and more than 3 items of sensory requirements are unqualified, then the
sheet (piece) is judged as unqualified.
7.3.3.2 Decision rules for the whole batch
In three sheets (pieces) of test samples, if all the three samples are qualified, then the
batch of the products is judged as qualified. If one sheet (piece) or more than one are
unqualified, then double sampling 6 sheets (pieces) for re-inspection. If one sheet (piece)
or more than one are unqualified in the six sheets (pieces), then the batch of the products
is judged unqualified.
8 Mark, package, transportation and storage
The mark, package, transportation and storage shall be in accordance with the provisions
of QB/T 2801.
......
| Standard ID | QB/T 1873-2023 (QB/T1873-2023) | | Description (Translated English) | (Chrome Tanned Upper Leather) | | Sector / Industry | Light Industry Industry Standard (Recommended) | | Classification of Chinese Standard | Y46 | | Classification of International Standard | 59.140.30 | | Word Count Estimation | 8,895 | | Date of Issue | 2023-04-21 | | Date of Implementation | 2023-11-01 | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Summary | This standard specifies the product classification, requirements, grading, inspection rules and signs, packaging, transportation and storage of chrome-tanned leather for shoe uppers, describes the corresponding test methods, and defines related terms and definitions. This document is applicable to the production, inspection, grading and sales of chrome-tanned leather for shoe uppers. This document does not apply to transfer film leather. |
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