QB/T 2706-2005 English PDF (QBT2706-2005)

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QB/T 2706-2005: Leather. Chemical, physical and mechanical and fastness tests. Sampling location
QB/T 2706-2005
LIGHT INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.140
Classification No.: Y45
Filing No.: 15758-2005
Replacing QB/T 3812.1-1999
Leather - Chemical, physical and mechanical and fastness
tests - Sampling location
(ISO 2418:2002, Leather - Chemical, physical and mechanical and fastness tests -
Sampling location, MOD)
ISSUED ON: MARCH 19, 2005
IMPLEMENTED ON: SEPTEMBER 01, 2005
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Terms and definitions... 5 
3 Location of laboratory samples ... 5 
4 Storage of laboratory samples ... 9 
5 Identification of laboratory samples ... 9 
Foreword
This standard is the revision of QB/T3812.1-1999 "Leather-Laboratory sample -
Location and identification".
This standard modifies and adopts ISO 2418: 2002 "Leather - Chemical, physical and
mechanical and fastness tests - Sampling location", which is based on International
Leather Craftsmen and chemists Federation (IULTCS) standards IUP 2 and IUC 2.
QB/T 3812.1-1999 equivalently adopts ISO 2418:1972. The ISO 2418 has been revised,
which was replaced by ISO 2418:2002.
This standard was redrafted in accordance with ISO 2418:2002.
According to the actual situation in China, this standard has made the following
technical modifications, when adopting ISO 2418:2002:
- The "International leather industry terminology" (Second edition) was quoted in
the "Normative references" of the original standard; in this standard, DELETE the
chapter "Normative references", the subsequent chapters and articles are numbered
accordingly;
- DELETE the descriptive overhang paragraph in "Terms and definitions".
This standard has also made the following editorial changes:
- DELETE the foreword of the ISO standard;
- CHANGE the word "this international standard" into "this standard".
Compared with QB/T 3812.1-1999, the main changes of this standard are as follows:
- CANCEL some definitions in the original standard;
- CANCEL contents of Chapters 3 and 4 in the original standard;
- ADJUST the requirements for identification.
This standard was proposed by China National Light Industry Federation.
This standard shall be under the jurisdiction of the National Leather Industry
Standardization Technical Committee (SAC/TC 252).
Drafting organization of this standard: China Leather and Footwear Industry Research
Institute.
The main drafters of this standard: Zhao Liguo.
Leather - Chemical, physical and mechanical and fastness
tests - Sampling location
1 Scope
This standard specifies the location, where laboratory samples are cut, from a single
(piece) of leather, as well as the method for marking the cut laboratory samples.
This standard applies to leather, which is processed from various mammalian skins.
This standard does not apply to leather, which is processed from bird, fish, reptile skins.
2 Terms and definitions
The following terms and definitions apply to this standard.
2.1
Laboratory sample
Samples, which are taken from the areas specified in Chapter 4.
3 Location of laboratory samples
3.1 Overview
3.1.1 Selection of samples
3.1.1.1 The area, where the laboratory sample is selected, shall be free from obvious
defects of various types, such as scratches and knives from peeling.
3.1.1.2 The sampling procedure applies to sampling for physical, chemical, color
fastness tests.
3.1.2 Sampling for physical and color fastness tests
Samples for physical and color fastness tests are cut from the areas in Figures 1 ~ 4,
where there is no shadow bar.
3.1.3 Sampling for chemical tests
3.1.3.1 The samples for chemical test are cut from the area with shadow bars, in Figures
1 ~ 4.
3.1.3.2 If the minimum sample block, which is required for the chemical test, cannot be
obtained, take a sample from the corresponding part on the other side of the back ridge
line of the sample. If sufficient samples cannot be obtained, take samples from areas,
which are adjacent to the sampling location.
3.1.3.3 Except for arbitration analysis, clean specimens, which are not contaminated
during physical testing, may be used for chemical test. In arbitration analysis, leather
specimens for chemical test can only be taken from the correct location.
3.2 Whole leather
Cut out the square block GJKH without shadow bar AND/OR the square block HLMN
with shadow bar, according to Figure 1. In smaller leathers, the distances, EF and JK,
which are required for a single specimen, can be shortened appropriately. When
sampling from smaller leather, if the sampling method is changed, a minimum deviation
from this procedure shall be maintained.
3.3 Half-hip back leather
Cut out the square block GJKH without shadow bar AND/OR the square block HLMN
with shadow bar, according to Figure 2.
3.4 Shoulder leather
Cut out the square block ABCD without shadow bar AND/OR the square block AEFG
with shadow bar, according to Figure 3.
3.5 Ventral leather
Cut out the square blocks GJKH without shadow bars AND/OR the square blocks
LMNG and HPQR with shadow bars, according to Figure 4.