GB/T 2910.7-2009 English PDF (GB/T2910.7-2009)

GB/T 2910.7-2009: Textiles -- Quantitative chemical analysis -- Part 7: Mixtures of polyamide and certain other fibers (method using formic acid)
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GB/T 2910.7-2009
GB/T2910.7-2009
GB
ICS 59.080.01
W 04
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
GB/T 2910.7-2009 / ISO 1833-7. 2006
Partially replacing GB/T 2910-1997
Textiles - Quantitative Chemical Analysis - Part 7.
Mixtures Of Polyamide And Certain Other Fibers
(Method Using Formic Acid)
(ISO 1833-7.2006, IDT)
ISSUED ON. JUNE 15, 2009
IMPLEMENTED ON. JANUARY 1, 2010
Jointly issued by. General Administration of Quality Supervision, Inspection
and Quarantine (GAQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1  Scope ... 6 
2  Normative References ... 6 
3  Principle ... 6 
4  Reagents ... 6 
5  Apparatus ... 7 
6  Test Procedure ... 7 
7  Calculation And Expression Of Results ... 7 
8  Precision ... 8 
Bibliography ... 9 
Foreword 
GB/T 2910 “Textiles-Quantitative Chemical Analysis” consists of the following parts.
- Part 1. General principles of testing;
- Part 2. Ternary fiber mixtures;
- Part 3. Mixtures of acetate and certain other fibers (method using acetone);
- Part 4. Mixtures of certain protein and certain other fibers (method using
hypochlorite);
- Part 5. Mixtures of viscose, cupro or modal and cotton fibers (method using
sodium zincate);
- Part 6. Mixtures of viscose or certain types of cupro or modal or lyocell and cotton
fibers (method using formic acid and zinc chloride);
- Part 7. Mixtures of polyamide and certain other fibers (method using formic acid);
- Part 8. Mixtures of acetate and triacetate fibers (method using acetone);
- Part 9. Mixtures of acetate and triacetate fibers (method using benzyl alcohol);
- Part 10. Mixtures of triacetate or polylactide and certain other fibers (method
using dichloromethane);
- Part 11. Mixtures of cellulose and polyester fibers (method using sulfuric acid);
- Part 12. Mixtures of acrylic, certain modacrylics, certain chlorofibers, certain
elastanes and certain other fibers (method using dimethylformamide);
- Part 13. Mixtures of certain chlorofibers and certain other fibers (method using
carbon disulfide/acetone);
- Part 14. Mixtures of acetate and certain chlorofibers (method using acetic acid);
- Part 15. Mixtures of jute and certain animal fibers (method by determining
nitrogen content);
- Part 16. Mixtures of polypropylene fibers and certain other fibers (method using
xylene);
- Part 17. Mixtures of chlorofibers (homopolymers of vinyl chloride) and certain
other fibers (method using sulfuric acid);
Textiles - Quantitative Chemical Analysis - Part7.
Mixtures Of Polyamide And Certain Other Fibers
(Method Using Formic Acid)
1 Scope
This part of GB/T 2910 specifies a method, using formic acid, to determine the
percentage of polyamide fiber, after removal of non-fibrous matter in textiles that are
made of binary mixtures of polyamide and cotton, viscose, cupro, modal, polyester,
polypropylene, chlorofiber, acrylic or glass fiber.
It is also applicable to mixtures with wool and animal hair. However, when the wool
content exceeds 25 %, the method described in GB/T 2910.4 should be used.
2 Normative References
The following normative documents contain provisions which, through reference in
this part of GB/T 2910, constitute provisions of this part. For dated reference,
subsequent amendments (excluding corrigendum content) to, or revisions of, any of
these publications do not apply. However, all parties coming to an agreement
according to this Part are encouraged to study whether the latest editions of these
documents are applicable. For undated references, the latest edition of the normative
document referred to applies.
GB/T 2910.1 Textiles - Quantitative Chemical Analysis - Part 1. General Principles Of
Testing (GB/T 2910.1-2009, ISO 1833-1. 2006, IDT)
3 Principle
The polyamide is dissolved out from a known dry mass of the mixture, with aqueous
formic acid. The residue is collected, washed, dried, and weighed; its mass, corrected
if necessary, is expressed as a percentage of the dry mass of the mixture. The
percentage of polyamide fiber is found by the difference.
4 Reagents
Use the reagents described in GB/T 2910.1 together with those given in 4.1 and 4.2.
Bibliography
[1] GB/T 2910.4 Textiles-Quantitative chemical analysis - Part 4. Mixtures of certain
protein and certain other fibers (method using hypochlorite) (GB/T 2910.4–2009,
ISO 1833-4.2006, IDT)
GB/T 2910.7-2009
GB/T2910.7-2009
GB
ICS 59.080.01
W 04
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
GB/T 2910.7-2009 / ISO 1833-7. 2006
Partially replacing GB/T 2910-1997
Textiles - Quantitative Chemical Analysis - Part 7.
Mixtures Of Polyamide And Certain Other Fibers
(Method Using Formic Acid)
(ISO 1833-7.2006, IDT)
ISSUED ON. JUNE 15, 2009
IMPLEMENTED ON. JANUARY 1, 2010
Jointly issued by. General Administration of Quality Supervision, Inspection
and Quarantine (GAQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1  Scope ... 6 
2  Normative References ... 6 
3  Principle ... 6 
4  Reagents ... 6 
5  Apparatus ... 7 
6  Test Procedure ... 7 
7  Calculation And Expression Of Results ... 7 
8  Precision ... 8 
Bibliography ... 9 
Foreword 
GB/T 2910 “Textiles-Quantitative Chemical Analysis” consists of the following parts.
- Part 1. General principles of testing;
- Part 2. Ternary fiber mixtures;
- Part 3. Mixtures of acetate and certain other fibers (method using acetone);
- Part 4. Mixtures of certain protein and certain other fibers (method using
hypochlorite);
- Part 5. Mixtures of viscose, cupro or modal and cotton fibers (method using
sodium zincate);
- Part 6. Mixtures of viscose or certain types of cupro or modal or lyocell and cotton
fibers (method using formic acid and zinc chloride);
- Part 7. Mixtures of polyamide and certain other fibers (method using formic acid);
- Part 8. Mixtures of acetate and triacetate fibers (method using acetone);
- Part 9. Mixtures of acetate and triacetate fibers (method using benzyl alcohol);
- Part 10. Mixtures of triacetate or polylactide and certain other fibers (method
using dichloromethane);
- Part 11. Mixtures of cellulose and polyester fibers (method using sulfuric acid);
- Part 12. Mixtures of acrylic, certain modacrylics, certain chlorofibers, certain
elastanes and certain other fibers (method using dimethylformamide);
- Part 13. Mixtures of certain chlorofibers and certain other fibers (method using
carbon disulfide/acetone);
- Part 14. Mixtures of acetate and certain chlorofibers (method using acetic acid);
- Part 15. Mixtures of jute and certain animal fibers (method by determining
nitrogen content);
- Part 16. Mixtures of polypropylene fibers and certain other fibers (method using
xylene);
- Part 17. Mixtures of chlorofibers (homopolymers of vinyl chloride) and certain
other fibers (method using sulfuric acid);
Textiles - Quantitative Chemical Analysis - Part7.
Mixtures Of Polyamide And Certain Other Fibers
(Method Using Formic Acid)
1 Scope
This part of GB/T 2910 specifies a method, using formic acid, to determine the
percentage of polyamide fiber, after removal of non-fibrous matter in textiles that are
made of binary mixtures of polyamide and cotton, viscose, cupro, modal, polyester,
polypropylene, chlorofiber, acrylic or glass fiber.
It is also applicable to mixtures with wool and animal hair. However, when the wool
content exceeds 25 %, the method described in GB/T 2910.4 should be used.
2 Normative References
The following normative documents contain provisions which, through reference in
this part of GB/T 2910, constitute provisions of this part. For dated reference,
subsequent amendments (excluding corrigendum content) to, or revisions of, any of
these publications do not apply. However, all parties coming to an agreement
according to this Part are encouraged to study whether the latest editions of these
documents are applicable. For undated references, the latest edition of the normative
document referred to applies.
GB/T 2910.1 Textiles - Quantitative Chemical Analysis - Part 1. General Principles Of
Testing (GB/T 2910.1-2009, ISO 1833-1. 2006, IDT)
3 Principle
The polyamide is dissolved out from a known dry mass of the mixture, with aqueous
formic acid. The residue is collected, washed, dried, and weighed; its mass, corrected
if necessary, is expressed as a percentage of the dry mass of the mixture. The
percentage of polyamide fiber is found by the difference.
4 Reagents
Use the reagents described in GB/T 2910.1 together with those given in 4.1 and 4.2.
Bibliography
[1] GB/T 2910.4 Textiles-Quantitative chemical analysis - Part 4. Mixtures of certain
protein and certain other fibers (method using hypochlorite) (GB/T 2910.4–2009,
ISO 1833-4.2006, IDT)