Vat Yellow 21 is a synthetic azo dye characterized by its yellow color. It is slightly soluble in dimethyl benzene and not soluble in alcohol. When treated with strong sulfuric acid, it turns dark red and then light purple, and upon dilution, it precipitates as yellow. In alkaline and acidic insurance powder solutions, it appears brown and bright yellow, respectively.

1328-40-1

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Basic information
1. Product Name: Vat Yellow 21
2. Synonyms: Vat Yellow 21
3. CAS NO:1328-40-1
4. Molecular Formula:
5. Molecular Weight: 0
6. EINECS: N/A
7. Product Categories: N/A
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: /
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: Vat Yellow 21(CAS DataBase Reference)
10. NIST Chemistry Reference: Vat Yellow 21(1328-40-1)
11. EPA Substance Registry System: Vat Yellow 21(1328-40-1)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 1328-40-1(Hazardous Substances Data)

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1328-40-1 Usage

Uses

Used in Textile Industry:
Vat Yellow 21 is used as a dye for coloring fabrics, particularly in the textile industry. It is known for its excellent ironing fastness, chlorine bleach fastness, light fastness, and oxygen bleach fastness, making it a popular choice for various applications.
Used in Mercerized Fabrics:
Vat Yellow 21 is used as a dye for mercerized fabrics, which are treated to increase their luster and strength. It provides good staining and fading properties, making it suitable for this application.
Used in Soaping:
Vat Yellow 21 is also used in the soaping process, which is a finishing treatment for fabrics to improve their softness, luster, and appearance. Its compatibility with soaping processes makes it a valuable dye for this purpose.
Standards:
The fastness and performance of Vat Yellow 21 are measured using various standards, such as ISO and AATCC. It has received ratings of 5 for ironing fastness, chlorine bleach, and light fastness, indicating its high performance in these areas. It also has a rating of 4-5 for oxygen bleach fastness and a rating of 4 for staining and fading, demonstrating its overall effectiveness as a dye.

Preparation

: in the low temperature will be 2-(Chloromethyl)anthracene-9,10-dione?(or its chlorine derivatives) and brimstone heating, Sodium hypochlorite processing and then use the product.

Standard

Ironing Fastness

Fading

Stain

ISO

AATCC

Check Digit Verification of cas no

The CAS Registry Mumber 1328-40-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,2 and 8 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1328-40:
(6*1)+(5*3)+(4*2)+(3*8)+(2*4)+(1*0)=61
61 % 10 = 1
So 1328-40-1 is a valid CAS Registry Number.

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