QB/T 2711-2005Leather. Physical and mechanical tests. Determination of tear load. Double edge tear (English PDF)

Foreword

This standard is a revision of QB/T 3812.6-1999 "Leather - Determination of

tear force".

This standard modifies and adopts ISO 3377-2.2002 "Leather - Physical and

mechanical tests - Determination of tear load - Double tear". This international

standard is based on the International Federation of Leather Craftsmen and

Chemists (IULTCS) standard IUP 8.

QB/T 3812.6-1999 equivalently adopts ISO 3377.1975.ISO 3377 has been

revised, which was replaced by ISO 3377.2002.

This standard was redrafted in accordance with ISO 3377-2.2002.

According to the actual situation in our country, this standard has undergone

the following technical changes when adopting ISO 3377-2.2002.

- In the "Normative references", RE-WRITE the originally cited ISO standard

to relevant Chinese standards;

- SIMPLIFY the requirements for tensile testing machines; REMOVE the

requirements for quoting ISO 7500-1;

- According to the custom in our country, DIVIDE the sampling and specimen

preparation in 5.1 into two clauses; the subsequent clause numbers are

changed accordingly;

- In order to prevent incorrect understanding of the standard in use, DELETE

the reference "note" in 5.1.

This standard has also undergone the following editorial changes.

- DELETE the foreword of the ISO standard;

- CHANGE the term "this international standard" with "this standard";

- USE the decimal point "." to replace the comma "," which was used as a

decimal point.

Compared with QB/T 3812.6-1999, the main changes of this standard are as

follows.

- ADD 2 "Normative references", 5 "Sampling and specimen preparation";

- CANCEL the contents of chapter 5 of the original standard.

Leather - Physical and mechanical tests -

Determination of tear load - Double edge tear

1 Scope

This standard specifies the method for measuring the tear force of leather - the

double edge tear method (Baumann tear).

This standard applies to all types of leather.

2 Normative references

The provisions in following documents become the provisions of this Standard

through reference in this Standard. For the dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this Standard;

however, parties who reach an agreement based on this Standard are

encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

QB/T 2706 Leather - Chemical physical and mechanical and fastness tests

- Sampling location (ISO 2418.2002, MOD)

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

and conditioning (ISO 2419.2006, MOD)

QB/T 2709 Leather - Physical and mechanical tests - Determination of

thickness (ISO 2589.2002, MOD)

3 Principle

The rectangular specimen of the specified shape (with a hole in the middle) is

placed on the test hooks of the upper and lower fixtures of the tensile testing

machine. The maximum force reached when the tensile testing machine is

running is the tear force of the specimen.

4 Device

5 Sampling and specimen preparation

6 Procedure

7 Test report

The test report should include the following.

a) This standard number;

b) Sample name, number and type;

c) Detailed information of the specimen, inconsistency between the sampling

and QB/T 2706-2005;

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