QB/T 2716-2018 English PDF (QBT2716-2018)

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QB/T 2716-2018: Leather -- Preparation of chemical test samples
QB/T 2716-2018
LIGHT INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.140.30
Classification No.: Y 46
Filing No.: 67447-2019
Replacing QB/T 2716-2005
Leather - Preparation of chemical test samples
(ISO 4044:2008, Leather - Chemical tests - Preparation of chemical test samples,
MOD)
ISSUED ON: DECEMBER 21, 2018
IMPLEMENTED ON: JULY 01, 2019
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Principles ... 5 
4 Devices ... 5 
5 Sampling and preparation of specimen ... 5 
6 Preservation of specimen ... 6 
7 Test report ... 6 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces QB/T 2716-2005 "Leather - Preparation of chemical test
samples".
Compared with QB/T 2716-2005, in additional to editorial changes, the main technical
differences between this standard and QB/T 2716-2005 are as follows:
- ADD reference to "QB/T 2707";
- In "3 Principles", ADD "Powder" to the cutting of the specimen;
- In "4 devices", CHANGE the unit of rotation speed, from "rpm/min" to "r/min";
CHANGE the screen aperture to (4 ± 0.5) mm, which was consistent with the ISO
international standard;
- In "5.2 Preparation of specimen", CHANGE the strip size of the specimen, before
cutting into "Determined by the feeding system of the cutting device"; DELETE
the "Note 1" in the original standard; ADJUST the conditioning of the dried
specimen to the explanatory "Note 2"; ADD the content of test cutting as the
explanatory "Note 1";
- ADD the provisions for hand-cut samples.
This standard uses the redrafting method, to modify and adopts ISO 4044:2008 "Leather
- Chemical tests - Preparation of chemical test samples". The method, which is used by
ISO 4044:2008, is based on the method standard IUC 3 of the International Union of
Leather Technologists and Chemists (IULTCS).
The technical differences between this standard and ISO 4044:2008 are:
- In "Normative references", USE the relevant national standards of China; ADD the
reference to "QB/T 2706";
- ADJUST the cleaning operation of the cutting device in "5 Preparation of
specimen" in the original international standard, to the explanatory note to "4
Device";
- DIVIDE "5 Preparation of specimen" into "5.1 Sampling" and "5.2 Preparation of
specimen"; ADD the provisions for "Sampling" in 5.1; ADJUST part of the content
to the explanatory note to "5.2 Preparation of specimen";
- ADD the provisions for hand-cut samples;
- ADD the content of "7 Test report", for ease of use.
Leather - Preparation of chemical test samples
1 Scope
This standard specifies the preparation method of leather specimens for chemical
testing.
This standard applies to all types of leather.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
QB/T 2706 Leather - Chemical physical and mechanical and fastness tests -
Sampling location (QB/T 2706-2005, ISO 2418:2002, MOD)
QB/T 2707 Leather - Physical and mechanical tests - Sample preparation and
conditioning (QB/T 2707-2018, ISO 2419:2006, MOD)
3 Principles
Use a cutting device, to cut the leather samples into granules or powders of suitable size.
4 Devices
The cutting device is equipped with a rotating cutting knife; the rotating speed is 700
r/min ~ 1000 r/min; the cutting knife is as sharp as possible; it is equipped with a screen
with an aperture of (4 ± 0.5) mm.
Note: Cutting devices, screens, collectors shall be completely cleaned after each use, BUT they
shall not be washed with water.
5 Sampling and preparation of specimen
5.1 Sampling
Carry out according to the requirements of QB/T 2706.