QB/T 2537-2001 PDF EnglishUS$70.00 · In stock · Download in 9 seconds
QB/T 2537-2001: Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete
Similar standardsQB/T 2537-2001: Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QBT2537-2001 QB 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 Contents1 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... 9ForewordThis 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 rubbing1 ScopeThis 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 referencesThe 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 tests3 PrincipleOne 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 materials4.1 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 specimensTest 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 felt6.1 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 Procedure7.1 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 reportThe test report shall include the following information. QB/T 2537-2001 QB 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 CouncilTable of Contents1 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... 9ForewordThis 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 rubbing1 ScopeThis 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 referencesThe 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 tests3 PrincipleOne 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 materials4.1 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 specimensTest 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 felt6.1 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 Procedure7.1 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 reportThe test report shall include the following information. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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