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QB/T 2537-2001Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing (English PDF)

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Issued by

China National Light Industry Council

Level / Type

National · Recommended

Issue date

November 15, 2001

Implementation date

May 1, 2002

Scope

QB/T 2537-2001 (Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing) is available as an English-translated PDF.

QB/T 2537-2001 — This Standard specifies a method for determining the colour fastness behaviour of the surface of a leather on rubbing with a wool felt. This Standard applies to leathers of all kinds.

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Document preview — QB/T 2537-2001

National Standard of the People's Republic of China

Issued by: China National Light Industry Council

1 Scope...5
2 Normative references...5
3 Principle...5
4 Apparatus and materials...6
5 Test specimens...7
6 Conditioning of test specimens and pieces of felt...7
7 Procedure...8
8 Test report...9

Foreword

This Standard is equivalent to ISO 11640.1993, Leather – Tests for colour fastness –

Colour fastness to cycles of to-and-fro rubbing

The drafting of this Standard is slightly different from ISO 11640.1993, and refines

some specifications of ISO 11640.1993, for the convenience of use in China, but they

will not affect the technical requirements and test results of the standard. Descriptions

are as follows.

1) In 6.2, ISO 11640 specifies. take wool felt out from water before use; squeeze

water to make weight of wool felt to reach approximately 1 g. This Standard

modifies it. take each piece of wool felt before use; place it between 4 pieces of

absorbent blotting paper (with 2 pieces each on the top and bottom, making test

surface in contact with blotting paper horizontal plane); place weight (900 ± 10)

g on blotting paper for 1 min; squeeze water to make weight of wool felt to reach

approximately 1 g. It is verified by tests that the content added can meet the

specifications of ISO 11640; and meanwhile, it enables testing personnel to take

uniform test methods to operate more accurately and reduce test errors and

ensure consistency of test results.

2) The modification content of 6.4 is the same as 1).

3) In 7.2, "Due to the higher friction on suede leathers and suede-like leathers, it

can be desirable in such cases to carry out the test with a total mass of 500 g

(i.e. without the additional weight-piece)." It is NOTE in ISO 11640; based on the

actual conditions of China, it is made an official provision of this Standard for

convenience of use; and the content "including front clothing leathers" is added.

4) Annex A of the International Standard ISO 11640.1993 recommends the

commercial sources of apparatus and materials used for this test method

standard; Annex B gives names and numbers of IUF International Standards

related to this Standard, which are not referenced in this Standard.

Test results of this Standard are not comparable with test results of QB/T 1327-1991,

Test method for colour rubbing fastness of leather surface.

This Standard was proposed by the General Business Department of China National

Light Industry Council.

This Standard shall be under the jurisdiction of the National Standardization Technical

Committee on Leather.

This Standard was drafted by the National Standardization Technical Committee on

Leather.

The main drafter of this Standard. Zhao Liguo.

Leather – Tests for colour fastness –

Colour fastness to cycles of to-and-fro rubbing

1 Scope

This Standard specifies a method for determining the colour fastness behaviour of the

surface of a leather on rubbing with a wool felt.

This Standard applies to leathers of all kinds.

2 Normative references

The provisions in following standards become the provisions of this Standard through

reference in this Standard. When this Standard is published, all standards indicated

are valid. All standards will be amended, so all parties using this Standard shall discuss

the use of the latest editions of the following standards.

GB 250-1995 Gray scale for assessing change in colour

GB 251-1995 Gray scale for assessing staining

GB/T 6682-1992 Water for laboratory use – Specifications and test methods

GB/T 3812.2-1999 Leather – Conditioning of test pieces for physical tests

3 Principle

One side of the leather specimen is rubbed with pieces of reference wool felt under a

given pressure for a given number of forward and backward motions. The degree of

colour staining of the wool felt and the change in colour of the leather are assessed

with grey scales. Any other visible change in, or damage to, the surface of the leather

is also reported.

4 Apparatus and materials

4.1 Rub fastness test apparatus incorporating the elements specified in 4.1.1 to 4.1.3,

and optionally including those specified in 4.1.4.

4.1.1 A carriage with.

4.1.2 A finger, 500 g ± 25 g in mass, removable, yet able to be fixed firmly in place,

with.

4.1.3 Means for driving the carriage to and fro with a distance of travel of 35 mm to

40 mm at a frequency of 40 cycles/min ± 2 cycles/min for the complete forward and

backward motion.

4.2 Rubbing material, square pieces of white or black wool felt, measuring

approximately 15 mm × 15 mm, punched out of a sheet of pure wool felt meeting the

following specification.

4.3 Vessel suitable for evacuation, e.g. vacuum-desiccator.

4.4 Vacuum pump, capable of evacuating the vessel (4.3). The vacuum pump shall

be capable of achieving approximately 5 kPa (50 mbar) within 4 min.

4.5 Demineralized water, grade 3 in accordance with GB/T 6682.

5 Test specimens

Test specimens shall be rectangular pieces of leather, at least 120 mm long and, for

each position of the finger [see 4.1.4 a)], at least 20 mm wide.

6 Conditioning of test specimens and pieces of felt

6.1 Dry leather and dry felt

Condition leather and wool felt in accordance with QB/T 3812.2.

6.2 Wet felt

Wet the felt by placing pieces of felt in demineralized water (4.5). Heat the water to

boiling and allow it to boil gently until the felt pieces sink.

6.3 Wet leather specimens

Wet the leather by immersing specimens in demineralized water (4.5) in such a way

that there is no contact between specimens. Place the containing vessel in the vacuum

vessel, produce a vacuum of approximately 5 kPa and hold it for 2 min. Restore normal

pressure. Carry out this procedure two more times. Just before use, take the

specimens out of the water and remove excess water on their surfaces with blotting

paper.

6.4 Felt wetted with artificial perspiration solution

Wet the felt with the artificial perspiration solution, prepared as specified in QB/T

2464.23; carry out test in accordance with 6.3.

7 Procedure

7.1 Mount a conditioned specimen on the apparatus and stretch it 10 % in the

direction of rubbing. If the specimen cannot be extended linearly by 10 %, stretch it

less or not at all. If the specimen at 10 % extension does not remain stable during

rubbing, stretch it sufficiently to achieve stability. In both of the latter cases, state the

extension in the test report.

7.4 If required, repeat the test with another number of cycles with the finger in a fresh

position on the specimen (or a new specimen) and after replacing the felt by a new

piece.

7.5 Release the specimen and assess the rubbed area on the specimen and/or on

the pieces of felt for change in colour and staining, respectively, as specified in 7.6

Wetted specimens and pieces of felt shall be dried at ambient temperature before

assessment.

7.6 Assess the change in colour of the leather and the staining of the pieces of felt

with the grey scales in accordance with GB 250 and GB 251.Note any other visible

changes in the surface of the specimen, e.g. loss of gloss, development of polish,

flattening of the nap or destruction of finish.

8 Test report

The test report shall include the following information.

QB/T 2537-2001

LIGHT INDUSTRY STANDARD

CCS Y46

Registration No.. 9504-2001

Leather – Tests for colour fastness –

Colour fastness to cycles of to-and-fro rubbing

Issued on. NOVEMBER 15, 2001

Implemented on. MAY 1, 2002

Issued by. China National Light Industry Council

Table of Contents

1 Scope... 5

2 Normative references... 5

3 Principle... 5

4 Apparatus and materials... 6

5 Test specimens... 7

6 Conditioning of test specimens and pieces of felt... 7

7 Procedure... 8

8 Test report... 9