GB/T 25803-2021C.I. Disperse violet 26 (Disperse violet HFRL) (English PDF)

4.1

The quality of C.I. Disperse violet 26 (Disperse violet HFRL) shall comply with Table 1.

Table 1 - Quality requirements for C.I. Disperse violet 26 (Disperse violet HFRL) (item: index; test method):

1 Appearance: dark red uniform powder or granules; 6.1

2 Strength (relative to the standard), points: 100; 6.2

3 Shade (relative to the standard): visual - close to slightly different; 6.2. Instrumental (D65 illuminant) (a): DE <= 0.50; DC -0.30 to 0.30; DH -0.30 to 0.30; 6.2

4 Migration property, grade: >= 4; 6.3

5 Dispersibility, (grade/grade): >= A/3; 6.4

6 High-temperature dispersion stability, (grade/grade): >= A/3; 6.5

7 Large particles, grade: >= 3; 6.6

8 Exhaustion rate (130 °C, 60 min), %: >= 90.0; 6.7

9 Build-up, grade: >= C; 6.8

10 Harmful aromatic amines, mg/kg: in accordance with GB 19601 and GB/T 24101; 6.9

11 Heavy metal elements, mg/kg: in accordance with GB 20814; 6.10

(a) Whether the instrumental shade index is controlled is agreed between supplier and purchaser.

4.2

The colour fastness of C.I. Disperse violet 26 (Disperse violet HFRL) on polyester fabric, determined in accordance with 6.11 of this document, shall be not lower than the grades given in Table 2.

Table 2 - Colour fastness of C.I. Disperse violet 26 (Disperse violet HFRL) on polyester fabric, at depth of shade 1/1:

Light (xenon arc): 5

Washing with soap, 60 °C: change in colour 4-5; staining of cotton 4-5; staining of polyester 4-5

Perspiration, acid: change in colour 4; staining of cotton 4-5; staining of polyester 4-5

Perspiration, alkaline: change in colour 4; staining of cotton 4-5; staining of polyester 4-5

Dry heat, 210 °C: change in colour 4; staining of cotton 3; staining of polyester 2

Rubbing: dry 4-5; wet 4-5

Hot pressing, 200 °C: change in colour (after 4 h) 4-5

Note: 2.4 % (owf) corresponds to the 1/1 standard depth of shade.

5.1

Sampling is carried out by batch; a quantity of product blended uniformly at one time constitutes a batch.

5.2

The number of packages sampled in each batch shall comply with 7.6 of GB/T 6678-2003.

5.3

The packaging of the product to be sampled shall be intact, and no foreign matter shall be allowed to enter the product during sampling. Samples shall be taken with a sampling probe from the upper, middle and lower parts, and the total quantity of the sample shall be not less than 200 g.

5.4

The samples taken shall be thoroughly mixed and divided between two clean, dry, well-sealed containers, each bearing a label stating the product name, batch number, name of the manufacturer, sampling date and place. One is used for inspection and the other is retained for reference.

6.1 Assessment of appearance

Assessed visually under natural north daylight.

6.2 Determination of shade and strength

6.2.1 Dye standard

The dye standard is the reference product used for determining shade and strength; it is agreed and sealed jointly by the supplier and the purchaser.

6.2.2 General dyeing conditions

The general conditions for dyeing shall comply with the relevant provisions of GB/T 2374-2017.

The depth of shade is 2.0 % (owf) and the pH of the dye bath is 5.0 to 6.0. Dyeing is carried out with 2 g of polyester fabric at a liquor ratio of 1:100, or with 5 g of polyester fabric at a liquor ratio of 1:20 or 1:40 (other liquor ratios may be chosen according to the actual situation, provided that level dyeing is ensured).

6.2.3 Preparation of dye baths

Taking dyeing of 2 g of polyester fabric at a liquor ratio of 1:100 as an example, prepare the dye baths in five dyeing cups as specified in Table 3.

Table 3 - Preparation of dye baths (volumes in millilitres, dyeing Nos. 1 to 5):

1 g/L suspension of the standard: 38, 40, 42, -, -

1 g/L suspension of the sample: -, -, -, 38, 40

Water: 162, 160, 158, 162, 160

6.2.4 Dyeing procedure

Carried out in accordance with 6.2 of GB/T 2394-2013.

6.2.5 Assessment of shade and strength

Carried out in accordance with the relevant provisions of 7.1 of GB/T 2374-2017.

6.3 Determination of migration property

Carried out in accordance with GB/T 27597.

6.4 Determination of dispersibility

Carried out in accordance with GB/T 5540.

6.5 Determination of high-temperature dispersion stability

Carried out in accordance with GB/T 5541.

6.6 Determination of large particles

Carried out in accordance with 5.1 of GB/T 5542-2016.

6.7 Determination of exhaustion rate

Carried out in accordance with the provisions of GB/T 9337-2009 on the determination of the exhaustion rate of disperse dyes in high-temperature dyeing. The depth of shade is 2.0 % (owf), the liquor ratio is 1:40, and the measuring wavelength is the wavelength of maximum absorption (about 543 nm).

6.8 Determination of build-up

Carried out in accordance with GB/T 2397.

6.9 Determination of harmful aromatic amines

Carried out in accordance with GB 19601 and GB/T 24101.

6.10 Determination of heavy metal elements

Carried out in accordance with GB 20814.

6.11 Determination of colour fastness on polyester fabric

6.11.1 General

All colour fastness test specimens are dyed to the 1/1 standard depth of shade in accordance with GB/T 4841.1-2006.

6.11.2 Colour fastness to rubbing

Carried out in accordance with GB/T 3920-2008.

6.11.3 Colour fastness to washing with soap

Carried out in accordance with GB/T 3921-2008, using test method C(3) of Table 2 of GB/T 3921-2008.

6.11.4 Colour fastness to perspiration

Carried out in accordance with GB/T 3922-2013.

6.11.5 Colour fastness to dry heat (excluding hot pressing)

Carried out in accordance with GB/T 5718-1997 at a test temperature of 210 °C.

6.11.6 Colour fastness to hot pressing

Carried out in accordance with GB/T 6152-1997, dry pressing at 200 °C (assessed after 4 h).

6.11.7 Colour fastness to artificial light

Carried out in accordance with GB/T 8427-2019.

7.1 Classification of inspection

Inspection is divided into type inspection and factory (release) inspection.

All the items listed in Clause 4 are type inspection items. Items 1 to 7 of Table 1 are factory inspection items and shall be inspected batch by batch.

7.2 Type inspection

Under normal continuous production, type inspection shall be carried out at least once a year. Type inspection shall also be carried out in any of the following cases:

a) when a new product is first finalised;

b) when the product is manufactured at a different site;

c) when there is a major change in formulation, process or raw materials;

d) when production is resumed after a stoppage of three months;

e) when requested by the customer.

7.3 Factory inspection

The product may leave the factory only after it has passed inspection by the manufacturer's quality inspection department and is accompanied by a certificate of conformity. The manufacturer shall ensure that all C.I. Disperse violet 26 (Disperse violet HFRL) products leaving the factory meet the requirements of this document.

7.4 Re-inspection and judgement

If any item of the inspection results does not meet the requirements of this document, samples shall be taken again from twice the number of packages for re-inspection. If even one item of the re-inspection results does not meet the requirements of this document, the whole batch shall be judged non-conforming.

8.1 Marking

Each package shall bear a firm and legible marking, including at least:

a) product name;

b) name and address of the manufacturer;

c) date of manufacture;

d) net content.

8.2 Labelling

The label shall state the date of manufacture, the certificate of conformity, the number of the standard applied and the batch number.