GB/T 7568.4-2002 English PDF (GBT7568.4-2002)

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GB/T 7568.4-2002: Textiles -- Tests for colour fastness -- Specification for polyester adjacent fabric
GB/T 7568.4-2002
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
W 04
Replacing GB 7566-1987
Textiles - Tests for color fastness -
Specification for polyester adjacent fabric
(ISO 105-F04:2001, Textiles - Tests for color fastness -
Part F04: Specification for polyester adjacent fabric, MOD)
ISSUED ON: OCTOBER 16, 2002
IMPLEMENTED ON: APRIL 01, 2003
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Materials ... 6 
4 Requirements for polyester adjacent fabric ... 6 
5 Evaluation of staining performance of tested polyester adjacent fabric ... 6 
Appendix A (Informative) Preparation of polyester adjacent fabric and stained
reference fabric ... 8 
Foreword
GB/T 7568 is divided into 7 parts:
- Specification for wool adjacent fabric;
- Specification for cotton and viscose standard adjacent fabric;
- Specification for polyamide standard adjacent fabric;
- Specification for polyester adjacent fabric;
- Specification for acrylic adjacent fabric;
- Specification for silk adjacent fabric;
- Specification for multi-fiber standard adjacent fabric.
This part is the part 4 of GB/T 7768. It modifies and uses the ISO 105-F04:2001
Textiles - Tests for color fastness - Part F04: Specification for polyester adjacent
fabric (English version).
This part replaces the GB 7566-1987 Textiles - Tests for color fastness -
Specification for standard adjacent fabric: Polyester, because the original
standard is technically obsolete due to international development.
Since there is a national standard equivalent to the ISO standard in this part of
the normative references, the degree of consistency between this part and ISO
105-F04:2001 is modified adoption.
For ease of use, this part has made the following editorial changes:
a) CHANGE the word "this part of ISO" into this part;
b) USE a decimal point “.” To replace the comma “,” which functions as a
decimal point;
c) DELETE the foreword to international standards.
As compared with GB 7566-1987, the main changes in this part are as follows:
- CHANGE the mass per unit area into (130 ± 5) g/m2;
- CHANGE the evaluation index of the staining performance of the adjacent
fabric into: Use the grey scale for discoloration assessment as specified in
GB 250 to evaluate the polyester adjacent fabric to be tested after staining
and the polyester reference adjacent fabric, the color difference shall be not
more than 4 ~ 5;
Textiles - Tests for color fastness -
Specification for polyester adjacent fabric
1 Scope
This part specifies an undyed polyester adjacent fabric suitable for use in
assessing staining in color fastness tests. The staining characteristics of the
polyester adjacent fabric to be tested shall be compared with the standard
polyester adjacent fabric for evaluation, which shall be carried out by a piece of
polyester stained reference fabric. All the reference fabrics shall be obtained
from the prescribed supply.
2 Normative references
The provisions in following documents become the provisions of this part
through reference in this part of GB/T 7568. For the dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this part; however, parties who reach an agreement based on this part are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 250 Gray scale for assessing change in color (GB 250-1995, idt ISO
105-A02:1993)
GB/T 4669 Textiles - Woven fabrics - Determination of mass per unit length
and mass per unit area (GB/T 4669-1995, eqv ISO 3801:1977)
GB/T 5718 Textiles - Tests for color fastness - Color fastness to dry heat
(excluding pressing) (GB/T 5718-1997, eqv ISO 105-P01:1993)
GB/T 7573 Textiles - Determination of pH of the aqueous extract (GB/T 7573-
2002, eqv ISO 3071:1980)
GB/T 8424.1 Textiles - Tests for color fastness - General principles for
measurement of surface color (GB/T 8424.1-2001, eqv ISO 105-J01:1997)
GB/T 8424.2 Textiles - Tests for color fastness - Instrumental assessment of
relative whiteness (GB/T 8424.2-2001, eqv ISO 105-J02:1997)
Appendix A
(Informative)
Preparation of polyester adjacent fabric and stained reference
fabric
A.1 Preparation of polyester adjacent fabric
A.1.1 Canvas work raw materials
Short fiber:
a) Single fiber 0.17 tex;
b) Length 38 mm;
c) Half matt, circular cross-section;
d) Disperse dye can stain it.
A.1.2 Warp and weft yarn
Warp: 16.3 tex, Z-twisted, 1110 twists x 2 per meter; S-twisted, 661 twists per
meter, double line (R) 32.6 tex.
Weft yarn: 22 tex, Z-twisted, 783 twists per meter.
Yarn shall not contain fluorescent brightener. The warp shall not contain pulp.
A.1.3 Gray fabric
Reed width of loom: 127 cm;
Texture: 1/1 plain weave;
Density of warp: (235 ± 5) / 10 cm;
Density of weft yarn: (205 ± 5) / 10 cm
A.1.4 Treatment
A.1.4.1 Boiling in dye vat
a) Water bath temperature 60 °C;
b) Use nonionic detergent (ethylene oxide poly-condensate) and sodium
pyrophosphate;