This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 3903.42-2008 Footwear - Test methods for uppers, lining and insocks - Colour migration, and the following main technical changes have been made with respect to GB/T 3903.42-2008:
——normative references are modified (see Clause 2; Clause 2 of Edition 2008);
——apparatus and material are modified (see Clause 4; Clause 4 of Edition 2008);
——sampling and conditioning are modified (see Clause 5; Clause 5 of Edition 2008);
——test method is modified (see Clause 6; Clause 6 of Edition 2008);
——test report is modified (see Clause 7; Clause 7 of Edition 2008).
This part, by means of translation, is identical to ISO 17701: 2016 Footwear - Test methods for uppers, lining and insocks - Colour migration. The Chinese documents consistent and corresponding with the normative international documents in this part are as follows:
——GB/T 250-2008 Textiles - Tests for colour fastness - Grey scale for assessing change in colour (ISO 105-A02:1993, IDT)
——GB/T 251-2008 Textiles - Tests for colour fastness - Grey scale for assessing staining (ISO 105-A03:1993, IDT)
——GB/T 2703-2017 Footwear - Vocabulary (ISO 19952:2005, NEQ)
——GB/T 6151-2016 Textiles - Tests for colour fastness - General principles of testing (ISO 105-A01:2010, MOD)
——GB/T 22049-2019 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear (ISO 18454:2018, IDT)
Editorial changes have been made in this part as follows:
——“Note: The thickness of glass of above size and mass, calculated according to an average density of ordinary glass of 2.5g/cm3, is about 4mm.” is added in 4.2 to facilitate users to choose suitable glass plates.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This part was proposed by the China National Light Industry Council.
This part is under the jurisdiction of National Technical Committee on Footwear of Standardization Administration of China (SAC/TC 305).
The previous edition of this part is as follows:
——GB/T 3903.42-2008.
Footwear - Test methods for uppers, lining and insocks - Colour migration
1 Scope
This part of GB/T 3903 specifies a test method for determining the propensity of a material to cause discolouration of another material when stored in close contact.
This part is applicable to all materials which are used in intimate contact to adhesives which are used to bond them.
2 Normative references
The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 105-A01 Textiles - Tests for colour fastness - Part A01: General principles of testing
ISO 105-A02 Textiles - Tests for colour fastness - Part A02: Grey scale for assessing change in colour
ISO 105-A03 Textiles - Tests for colour fastness - Part A03: Grey scale for assessing staining
ISO 18454 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear
ISO 19952 Footwear - Vocabulary
CIE 15 Colorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19952 and the following apply.
3.1
colour migration
discolouration caused by movement of colour from one material to another
4 Apparatus and material
The following apparatus and material shall be used.
4.1 Knife to cut the test specimen.
4.2 Two smooth and even glass plates at least 70mm×70mm and a mass of 50g±5g.
Note: The thickness of glass of above size and mass, calculated according to an average density of ordinary glass of 2.5g/cm3, is about 4mm.
4.3 Mass of sufficient size that when combined with the mass of the glass plate will exert a pressure of 5.2kPa±0.5kPa.
Note: The necessary mass depends on the area of the test specimen to get the same pressure.
Example:
Area of test specimen = 30mm×20mm = 600mm2
Mass = pressure × area
Mass＝5.2kPa×600mm2＝5,200Pa×600mm2＝5,200kg×m-1×s-2×6×10-4m-2
Mass＝3.12kg×m×s-2＝3.12N
A mass of 3.12N (these are 0.318kg) is necessary to get a pressure of 5.2kPa.
Please note that the mass of one glass plate has to be subtracted: mass = 318g-50g = 268g.
If the area of the test specimen is 50mm×40mm, a mass of 1.060kg is necessary to get the same pressure.
Please note that the mass of one glass plate has to be subtracted: mass = 1,060g-50g = 1,010g.
4.4 Oven, without a door or glass window, heated to 60℃±2℃.
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus and material
5 Sampling and conditioning
6 Test method
7 Test report
