GB/T 39365-2020Leather - Physical and mechanical tests - Determination of dry heat resistance (English PDF)

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 17227:2002

"Leather - Physical and mechanical tests - Determination of dry heat resistance

of leather".

Compared with ISO 17227:2002, the structural adjustments of this Standard

are as follows:

-- Adjust 7.4 of ISO 17227:2002 to the note of 7.3; merge 7.5 of ISO

17227:2002 into 7.3, and move the following chapters forward;

-- Merge 8.3 of ISO 17227:2002 into 8.2.

The technical differences between this Standard and ISO 17227:2002 and the

reasons are as follows:

-- With regard to the normative references, this Standard makes technical

adjustments to adapt to the technical conditions of China. The

adjustments are concentrated in Chapter 2 "Normative references". The

specific adjustments are as follows:

* Use GB/T 39364 which modifies and adopts international standards to

replace ISO 2418 (see 5.1);

* Use QB/T 2707 which modifies and adopts international standards to

replace ISO 2419 (see 4.5, 5.3 and 7.3);

-- Modify the description of the principle (see Chapter 3; Chapter 3 of ISO

17227:2002);

-- Modify the accuracy requirements of the vernier caliper (see 4.2; 4.2 of

ISO 17227:2002);

-- Delete the example of glazed-pottery tripod (see 4.3 of ISO 17227:2002);

-- Add provisions for sampling of non-standard parts (see 5.1);

-- Add regulations on the placement mode of the sample in the oven (see

7.2);

-- Modify the adjustment time of the sample after the test (see 7.3; 7.5 of ISO

17227:2002);

Leather - Physical and mechanical tests -

Determination of dry heat resistance

1 Scope

This Standard specifies the test method of dry heat resistance of leather.

This Standard applies to the determination of dry heat resistance of various

types of leather.

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.

GB/T 39364, Leather - Chemical, physical, mechanical and fastness tests -

Sampling location (GB/T 39364-2020, ISO 2418:2017, MOD)

QB/T 2707, Leather - Physical and mechanical tests - Sample preparation

and conditioning (QB/T 2707-2018, ISO 2419:2012, MOD);

3 Principle

Place the air-conditioned sample in an oven for heating; then, test the area

shrinkage of the sample; record other changes of the sample.

4 Instruments and apparatuses

6 Test conditions

7 Test method