GB/T 2910.22-2009Textiles - Quantitative chemical analysis - 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) (English PDF)

Foreword

GB/T 2910 Textiles - Quantitative Chemical Analysis includes the following parts.

--- Part 1: General Principle of Testing;

--- Part 2: Ternary Fiber Mixture;

--- Part 3: Mixtures of Acetate and Certain other Fibres (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 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 Modacrylic, Certain Chlorofibres, Certain Elastanes and 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 101: Mixtures of Soybean Protein Composite Fibre and Certain Other Fibers. This Part belongs to Part 22 of GB/T 2910.

GB/T 2910-1997 is replaced by the following standards. GB/T 2910.1, GB/T 2910.3,

GB/T 2910.4, GB/T 2910.6, GB/T 2910.7, GB/T 2910.8, GB/T 2910.9, GB/T 2910.10,

GB/T 2910.11, GB/T 2910.12, GB/T 2910.13, GB/T 2910.14, GB/T 2910.15, GB/T 2910.16, GB/T 2910.17, GB/T 2910.18, GB/T 2910.19 and GB/T 2910.22.

This Part together with GB/T 2910.6 replaced the Chapter 7 of GB/T 2910-1997 Textile - Binary Fiber Mixtures - Quantitative Chemical Analysis; compared with the Chapter 7 of GB/T 2910-1997, the differences are as follows.

--- Delete cotton from the scope.

1 Scope

This Part of GB/T 2910 specifies using formic acid and zinc chloride method to determine, after removing the non-fibrous substances, the fiber contents in the binary mixtures of viscose, certain type of cupro, modal, lyocell, flax, and ramie.

This Part is not applicable to the mixture the mixtures that can't be dissolved completely due to the viscose, certain type of cupro, model, modal, and lyocell containing the durable finishing agents and reactive dyes which can't be completely removed.

Safety warning. the substances or methods used in this Part may be hazardous to human health and environment if used improperly.

2 Normative References

The provisions in following documents become the provisions of this Part through reference in this Part of GB/T 2910. For dated references, the subsequent amendments (excluding corrigendum) 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/T 2910.1 Textiles - Quantitative Chemical Analysis - Part 1: General Principles of Testing (GB/T 2910.1-2009, ISO 1833-1:2006, IDT)

3 Principles

Use formic acid and zinc chloride reagents to dissolve and remove the viscose, certain type of cupro, model, modal, and lyocell from the mixture with known dry mass; collect the residues, clean, dry and weigh;

4 Reagents

Use the reagents specified in GB/T 2910.1 as well as 4.1 and 4.2 in this Part.

5 Apparatus

Use the apparatus specified in GB/T 2910.1 and 5.1 in this Part.

5.1 Conical flask with stopper with capacity no less than 200mL

6 Test Procedures

It shall be performed as per the procedures stipulated in GB/T 2910.1.40°C Method and 70°C Method can be selected as required.

6.1 40°C Method Place the specimen quickly into the conical flask containing the formic acid/zinc chloride solution with a preheated temperature of 40°C±2°C; add 100mL of formic acid/zinc chloride solution to each gram of the specimen (4.1), tighten the cap. Shake the conical flask, dip the specimen, stand for 2.5h at 40°C±2°C; shake once every 45min, totally shake twice.

6.2 70°C Method Place the specimen quickly into the conical flask containing the formic acid/zinc chloride solution with a preheated temperature of 70°C±2°C; add 100mL of formic acid/zinc chloride solution to each gram of the specimen (4.1), tighten the cap. Shake the conical flask, dip the specimen, stand for 20min±1min at 70°C±2°C, during which shake twice.

7 Result Calculation and Expression

The result calculation and expression shall conform to the provisions of GB/T 2910.1.

Value d of flax is 1.07; Value d of ramie is 1.00.

8 Precision

For the homogeneous mixture of textile materials, the confidence limit of this Method shall not exceed ±1 at the 95% confidence level. […]