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GB/T 39364-2020Leather - Chemical, physical, mechanical and fastness tests - Sampling location (English PDF)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 19, 2020

Implementation date

June 1, 2021

Scope

GB/T 39364-2020 (Leather - Chemical, physical, mechanical and fastness tests - Sampling location) is available as an English-translated PDF.

GB/T 39364-2020 — This Standard specifies the location where laboratory samples are cut from a single (sheet) of leather, and the method for marking the cut laboratory samples.

This Standard applies to the sampling of leather which is processed from various mammalian animal skins. This Standard does not apply to the sampling of leather which is processed from bird, fish and reptile skins.

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Document preview — GB/T 39364-2020

National Standard of the People's Republic of China

Issued by: SAMR; SAC

Foreword...3
1 Scope...4
2 Normative references...4
3 Terms and definitions...4
4 Location of laboratory samples...4
5 Storage of laboratory samples...10
6 Marking of laboratory samples...10

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard uses the redrafting method to modify and adopt ISO 2418:2017,

"Leather - Chemical, physical and mechanical and fastness tests - Sampling

location".

Compared with ISO 2418:2017, this Standard makes the following technical

modifications to adapt to the actual situation of China:

-- Add reference to QB/T 2262;

-- Modify the cutting location in "Sampling of parts with tension";

-- Add the requirement for "leather type" in the label.

This Standard was proposed by China National Light Industry Council.

This Standard shall be under the jurisdiction of National Technical Committee

252 on Leather of Standardization Administration of China (SAC/TC 252).

The drafting organizations of this Standard: Dongguan Zhongbiao Technology

Co., Ltd., Quanzhou College of Technology, Shenzhen Ansaima Safety

Protection Technology Co., Ltd., China Leather & Footwear Research Institute

Co., Ltd., Jiaxing Fur and Footwear Industry Research Institute, China Light

Inspection and Certification Co., Ltd.

The drafters of this Standard: Zhang Wenjun, Lai Xiaoyi, Zhang Jiankang, Li

Xuejun, Zhang Wenlong, Zheng Jiantang, Ren Zhibo.

Leather - Chemical, physical, mechanical and fastness

tests - Sampling location

1 Scope

This Standard specifies the location where laboratory samples are cut from a

single (sheet) of leather, and the method for marking the cut laboratory samples.

This Standard applies to the sampling of leather which is processed from

various mammalian animal skins.

This Standard does not apply to the sampling of leather which is processed

from bird, fish and reptile skins.

2 Normative references

The following documents are indispensable for the application of this document.

For dated references, only the dated version applies to this document. For

undated references, the latest edition (including all amendments) applies to this

document.

QB/T 2262, Terms of Leather Industry

3 Terms and definitions

Terms and definitions determined by QB/T 2262 are applicable to this document.

4 Location of laboratory samples

4.1 General

4.1.1 Division of leather parts

The whole leather is divided into buttocks-back, shoulder, and flank, as shown

in Figure 1.

4.1.3.2 The test sample for the arbitration inspection is taken from the

appropriate part of the whole leather (see 4.2).

4.1.4 Sampling for chemical test

4.1.4.1 The samples for chemical test are cut from the area with shadow strips

in Figure 2 ~ Figure 5.

4.1.4.2 If the smallest sample piece which is required for the chemical test

cannot be obtained, take samples from the corresponding part on the other side

of the sample's back line. If enough samples cannot be obtained, take samples

from adjacent parts of the sampling location.

4.1.4.3 Except for the arbitration analysis, clean samples that are not

contaminated in the physical test can be used for the chemical test.

4.1.4.4 The test sample for the arbitration inspection shall be taken from the

appropriate part in the area with shadow strips of the whole leather (see 4.2).

4.1.5 Sampling of parts with tension

If the whole leather is cut into half leather, tension will be generated at the edge

of the leather during the drying process of the toggling or other appropriate

drying methods. In this case, the sample cutting location will increase from 50

mm to 100 mm from the edge.

4.2 Whole leather

Cut out the square block GJKH without shadow strips and/or the square block

HLMN with shadow strips according to Figure 2. For leather of a small size, the

distances EF and JK which are required for a single sample can be

appropriately shortened. When sampling from leathers of a small size, if the

sampling method is changed, the minimum deviation from this procedure shall

be maintained.

Note: The samples can be cut on the left or right side of the whole leather.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

QB/T 2262

Cited by

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