GB/T 2910.11-2024 English PDF (GBT2910.11-2024)

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GB/T 2910.11-2024: Textiles - Quantitative chemical analysis - Part 11: Mixtures of certain cellulose fibres with certain other fibres(method using sulfuric acid)
GB/T 2910.11-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Replacing GB/T 2910.11-2009
Textiles - Quantitative chemical analysis - Part 11.Mixtures
of certain cellulose fibres with certain other fibres (method
using sulfuric acid)
(ISO 1833-11.2017, MOD)
ISSUED ON. APRIL 25, 2024
IMPLEMENTED ON. MAY 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 7
1 Scope... 9
2 Normative references... 9
3 Terms and definitions... 9
4 Principle... 10
5 Reagents... 10
6 Apparatus... 10
7 Test procedures... 10
8 Calculation and presentation of results... 11
9 Precision... 11
Appendix A (Informative) Identification method of polyester composite elastic fibres
... 12
Appendix B (Informative) Identification method of polyolefin elastic fibre... 14
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is Part 11 of GB/T 2910 Textiles - Quantitative chemical analysis. The
following parts have been issued for GB/T 2910.
-- Part 1.General principles of testing;
-- Part 2.Ternary fibre mixture;
-- Part 3.Mixtures of acetate and certain other fibres (method using acetone);
-- Part 4.Mixtures of certain protein fibres with certain other fibres (method
using hypochlorite);
-- Part 5.Mixtures of viscose, cupro or modal and cotton fibres (method using
sodium zincate);
-- Part 6.Mixtures of viscose or certain types of cupro or modal or lyocell and
cotton fibres (method using formic acid and zinc chloride);
-- Part 7.Mixtures of polyamide and certain other fibres (method using formic
acid);
-- Part 8.Mixtures of acetate and triacetate fibres (method using acetone);
-- Part 9.Mixtures of acetate and triacetate fibres (method using benzyl alcohol);
-- Part 10.Mixtures of triacetate or polylactide and certain other fibres (method
using dichloromethane);
-- Part 11.Mixtures of certain cellulose fibres with certain other fibres (method
using sulfuric acid);
-- Part 12.Mixtures of acrylic, certain modacrylics, certain chlorofibres, certain
elastane fibres with certain other fibres (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 chlorofibres (method using acetic
acid);
-- Part 15.Mixtures of jute and certain animal fibres (method by determining
nitrogen content);
Textiles - Quantitative chemical analysis - Part 11.Mixtures
of certain cellulose fibres with certain other fibres (method
using sulfuric acid)
1 Scope
This document describes a method for the determination of cellulose fibre content in
binary mixtures of certain cellulose fibres and certain other fibres consisting of the
following fibres, after removal of non-fibrous matter, using the sulfuric acid method.
-- natural cellulose fibres and regenerated cellulose fibres, such as cotton fibre,
linen fibre, hemp fibre, ramie fibre, viscose fibre, cupro fibre, modal fibre,
lyocell fibre, and
-- polyester fibre, polypropylene fibre, polyethylene fibre, polyester composite
elastic fibre, polyolefin elastic fibre, polypropylene/polyamide composite
fibre.
Note 1.Appendix A and Appendix B give the qualitative identification methods of
polyester composite elastic fibres and polyolefin elastic fibres, respectively.
Note 2.Polypropylene/polyamide composite fibre is a sheath-core composite fibre with
the sheath layer being polypropylene fibre and the core layer being polyamide
fibre.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
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 Terms and definitions
No terms and definitions need to be defined in this document.
4 Principle
Use 75% (mass fraction) sulfuric acid to dissolve and remove cellulose fibres from a
mixture of known dry mass; collect the residue; wash, dry and weigh it; use the
corrected mass to calculate its percentage of the dry mass of the mixture. Obtain the
percentage of cellulose fibres from the difference.
5 Reagents
Use the reagents specified in GB/T 2910.1 as well as 5.1 and 5.2.
5.1 Sulfuric acid (mass fraction 75%). Carefully add 700 mL of concentrated sulfuric
acid (ρ = 1.84 g/mL at 20 °C) into 350 mL of distilled water. After the solution cools to
room temperature, add distilled water to 1 L. The concentration range of the sulfuric
acid solution is allowed to be 73% ~ 77% (mass fraction).
5.2 Dilute ammonia solution. Add water to dilute 80 mL of concentrated ammonia
solution (ρ = 0.880 g/mL at 20°C) to 1 L.
6 Apparatus
Use the apparatus specified in GB/T 2910.1 as well as 6.1 and 6.2.
6.1 Stoppered conical flask, with a capacity not less than 500 mL, glass-stoppered.
6.2 Heating device, capable of maintaining the temperature at 50 ℃ ± 5 ℃.
7 Test procedures
Follow the general procedures specified in GB/T 2910.1, and then follow the steps
below.
Place the prepared sample in a conical flask (6.1); add 200 mL of sulfuric acid solution
(5.1) per gram of sample; plug the flask with a glass stopper; shake the flask to fully
moisten the sample; then keep the flask at 50 ℃ ± 5 ℃ for 1 h; shake it every 10 min.
Filter the residue into a glass crucible; drain the liquid by vacuum suction; then add a
small amount of sulfuric acid (5.1) to clean the flask. Drain the liquid by vacuum
suction; add new sulfuric acid solution (5.1) to the crucible to clean the residue; drain
the liquid by gravity for at least 1 minute; then use vacuum suction.
Use cold water to wash several times continuously; use dilute ammonia solution (5.2)
to neutralize twice; then use cold water to wash. Drain the liquid first by gravity and
then by suction for each washing. Finally, dry the crucible and the residue; cool; weigh.