FZ/T 01095-2002Textile - Test method of elastane fibre content (English PDF)

3.1 Method A. manually separate the elastane from other fibres; dry, cool and weigh

the elastane; calculate its percentage content.

3.2 Method B. as for binary products, after the components are qualitatively

identified, select proper reagent to dissolve and remove one component; wash, dry,

cool and weigh the insoluble fibre; then calculate the percentage content of each

component.

6.1.1.3.2 Put the prepared specimen in a conical flask, add 100mL of 20%

hydrochloric acid solution for each gram of specimen; continuously shake it for 15 min

at normal temperature so that the chinlon or the vinylon can be fully dissolved. Filter it

with a glass core crucible whose mass is known; wash the remaining fibre for 3 times

with a small amount of hydrochloric acid that has the same temperature and same

concentration; wash it with distilled water at room temperature for 4~5 times;

neutralize it for twice with weak ammonia water; then wash it with water until it acts

neutrality during the inspection with indicator; the liquor must be sucked and drained

by a vacuum pump after each washing.

6.1.1.3.3 Drying, cooling and weighing of specimen and insoluble fibre shall be

carried out according to Section 4.4 of GB/T 2910-1997. Value d. 1.00 for elastane.

6.1.2 Sulfuric acid method

6.1.2.1 Principle

Dissolve and remove the chinlon or vinylon with 40% sulphuric acid solution under the

specified conditions; wash, dry and weigh the remaining elastane fibre. Calculate the

percentage content of each component.

6.1.2.2 Reagent

6.1.2.2.1 40% (mass fraction) sulphuric acid

Take 500mL of concentrated sulfuric acid (20°C, with density of 1.84 g/mL); slowly

add into 1,330mL of distilled water; cool it to room temperature and correct its density

to 1.294 g/mL~1.312 g/mL. The concentration shall be controlled between 39% and

41%.

6.1.2.2.2 Diluted ammonia solution

Take 80mL of strong ammonia solution (with density of 0.880 g/mL); dilute it to

1,000mL with distilled water.

6.1.2.3 Test procedures

6.1.2.3.1 Specimen preparation shall be carried out according to Section 4.3 of GB/T

2910-1997.

6.1.2.3.2 Put the prepared specimen into a conical flask; add 100mL of 40%

sulphuric acid solution for per gram of specimen; and continuously stir it for 15min at

normal temperature so that the chinlon or the vinylon can be fully dissolved. Filter it

with a glass core crucible whose mass is known; wash the remaining fibre for 3 times

with a small amount of sulphuric acid that has the same temperature and same

65% (mass fraction) potassium thiocyanate (20°C, with density of 1.3913 g/mL).

Warning. this reagent will cause harm to the human body, thus, the user shall

take sound protection measures.

6.4.3 Test procedures

6.4.3.1 Specimen preparation shall be carried out according to Section 4.3 of GB/T

2910-1997.

6.4.3.2 Put the prepared specimen into a conical flask with 72°C±3°C 65%

potassium thiocyanate solution; add 100mL of test solution for each gram of specimen;

stir for 10 min to dissolve the acrylic fibre. Filter it with a glass core crucible whose

mass is known; wash the remaining fibre with the potassium thiocyanate that has the

same temperature for 3 times; wash it with water having same temperature for about

6.4.3.3 Drying, cooling and weighing of specimen and insoluble fibre shall be carried

out according to Section 4.4 of GB/T 2910-1997. Value d. 1.00 for elastane.

6.5 Elastane/acetate fibre and elastane/triacetate

6.5.1 Formic acid method (elastane/acetate fibre and elastane/triacetate)

6.5.1.1 Principle

Dissolve and remove the acetate or triacetate with 75% formic acid solution under the

specified conditions; wash, dry and weigh the remaining elastane fibre. Calculate the

percentage content of each component.

6.5.1.2 Reagent

6.5.1.2.1 75% (mass fraction) formic acid

Dilute 800 mL of 90% (mass fraction) formic acid (with the density of 1.204 g/mL) with

distilled water to 1 L to make the density reach 1.177 g/mL (20°C).

6.5.1.2.2 Diluted ammonia solution

Take 80mL of strong ammonia water (with density of 0.880 g/mL); dilute it to 1,000 mL

with distilled water.

6.5.1.3 Test procedures

6.5.1.3.1 Specimen preparation shall be carried out according to Section 4.3 of GB/T

The calculation method shall be carried out according to Section 4.5 of GB/T

2910-1997.