GB/T 2910.12-2023Textiles - Quantitative chemical analysis - Part 12: Mixtures of acrylic, certain modacrylics, certain chlorofibres, certain elastane fibres with certain other fibres(method using dimethylformamide) (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

"Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents".

This document is Part 12 of GB/T 2910 "Textiles - Quantitative chemical analysis".

GB/T 2910 has released the following parts:

- 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 cellulose and polyester 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);

- Part 16: Mixtures of polypropylene and certain other fibres (method using xylene);

- Part 17: Mixtures of chlorofibers (homopolymers of vinyl chloride) and certain

other fibers (method using sulfuric acid);

- Part 18: Mixtures of silk and wool or hair (method using sulfuric acid);

- Part 19: Mixtures of cellulose fibres and asbestos (method by heating);

- Part 20: Mixtures of elastane and some other fibers (method of using

dimethylacetamide);

- Part 21: Mixtures of chlorofibers, certain modacrylics, certain elastanes, acetates,

triacetates and certain other fibers (method using cyclohexanone);

- Part 22: Mixtures of viscose or certain types of cupro or modal or lyocell and flax

of ramie fibres (method using formic acid and zinc chloride);

- Part 23: Mixtures of polyethylene and polypropylene (method using

cyclohexanone);

- Part 24: Mixtures of polyester and some other fibers (method using phenol and

tetrachloroethane);

- Part 25: Mixtures of polyester and certain other fibres (method using trichloroacetic

acid and chloroform);

- Part 26: Mixtures of melamine and cotton or aramide fibers (method using hot

formic acid);

- Part 101: Mixtures of soybean protein composite fibre and certain other fibers.

This document replaces GB/T 2910.12-2009 "Textiles - Quantitative chemical analysis

- Part 12: Mixtures of acrylic, certain modacrylic, certain chlorofibres, certain elastanes

and certain other fibres (method using dimethylformamide)", compared with GB/T

2910.12-2009, in addition to structural adjustments and editorial changes, the main

technical changes are as follows:

- In the scope, ADD mulberry silk, lyocell fibres, polypropylene fibres,

elastiomultiester fibres, elastolefin fibres, melamine fibres, polypropylene/

polyamide bicomponent fibres, polyacrylate fibres; MODIFY animal fibres TO

wool and other animal hair fibres; MODIFY cotton (raw cotton, bleached cotton,

dyed cotton) TO cotton; CLARIFY certain elastanes to certain elastane fibres;

ADD a note (see Clause 1 of this document, Clause 1 of the 2009 edition);

- In the scope, MODIFY "This method can also be used for animal fibres, wool and

silk dyed by pre-metal complex dyeing, but not applicable for post-metal complex

dyed ones." TO "This document does not apply to textiles containing wool, other

animal hair fibres and mulberry silk dyed with chromium based mordant dyes."

(see Clause 1 of this document, Clause 1 of the 2009 edition);

Textiles - Quantitative chemical analysis - Part 12: Mixtures

of acrylic, certain modacrylics, certain chlorofibres, certain

elastane fibres with certain other fibres (method using

dimethylformamide)

1 Scope

This document describes a method using dimethylformamide to determine the content

of acrylic, modacrylics, chlorofibres or elastane fibres in the following bicomponent

mixtures, after removing non-fibrous matter:

- acrylic, certain modacrylics, certain chlorofibres, certain elastane fibres; and

- wool, other animal hair fibres, mulberry silk, cotton, viscose fibres, cupro fibres,

modal fibres, lyocell fibres, polyamide fibres, polyester fibres, polypropylene

fibres, elastiomultiester fibres, elastolefin fibres, melamine fibres, polypropylene/

polyamide bicomponent fibres, polyacrylate fibres and glass fibres.

This document does not apply to textiles containing wool, other animal hair fibres and

mulberry silk dyed with chromium based mordant dyes.

NOTE 1: ISO 16373-1 gives the dyestuff identification method.

NOTE 2: This method will cause great damage to some polyester fibres with a sheath-core structure

(low melting point polyester/polyester bicomponent fibres) in the filled flakes. Observe the state of

the remaining fibres after dissolution to confirm whether this method is applicable.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) 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 Terms and definitions

There are no terms or definitions to be defined in this document.

FILTER the liquid through a glass sand core crucible of known dry mass, retaining the

residue in the conical flask.

ADD another 60 mL of dimethylformamide; PLACE it in a water bath heating

equipment at 90 degrees C ~ 95 degrees C for 30 minutes. During this period, shake gently by hand at

intervals of about 10 minutes. FILTER the residue in the conical flask into a glass sand

core crucible, DRAIN the liquid by suction; USE dimethylformamide to wash the

residue in the conical flask into the glass sand core crucible, DRAIN the liquid by

suction.

USE about 1 L of hot water of 70 degrees C ~ 80 degrees C to wash the residue; FILL the glass sand

core crucible with hot water for each cleaning. The liquid is first drained under the

action of gravity and then by suction. If gravity drainage is too slow, use slight suction.

Finally, the glass sand core crucible and residue are dried, cooled, and weighed.

8 Calculation and expression of results

The calculation and expression of results are in accordance with GB/T 2910.1.

The mass change correction coefficient d value of wool, cotton, viscose fibres, cupro

fibres, modal fibres, lyocell fibres, polyamide fibres, polyester fibres, elastomultiester

fibres, melamine fibres and polyacrylate fibres is 1.01, and the value of the rest is 1.00.

9 Precision

For a homogeneous mixture of textile materials, at a confidence level of 95 %, the

confidence limits of the test results obtained by this method does not exceed +/-1 %.

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