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Pigment Red 21, also known as PR21, is a bright red synthetic organic pigment that is widely used for coloration in various materials due to its high lightfastness, heat stability, and excellent resistance to solvents and chemicals. It is a member of the azo pigment family, known for its strong, opaque color and versatility in industrial and commercial applications.

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  • 6410-26-0 Structure
  • Basic information

    1. Product Name: Pigment Red 21
    2. Synonyms: 4-[(2-chlorophenyl)azo]-3-hydroxy-n-phenyl-2-naphthalenecarboxamide;4-[(2-Chlorophenyl)azo]-3-hydroxy-N-phenylnaphthalene-2-carboxamide;C.I. 12300;pigment red 21;NAPTHOL RED YR;Pigment -- Pigment Red 21;Pigment red 21 (C.I. 12300);Pigment Scarlet Powder
    3. CAS NO:6410-26-0
    4. Molecular Formula: C23H16ClN3O2
    5. Molecular Weight: 401.85
    6. EINECS: 229-096-4
    7. Product Categories: N/A
    8. Mol File: 6410-26-0.mol
  • Chemical Properties

    1. Melting Point: N/A
    2. Boiling Point: 566.1 °C at 760 mmHg
    3. Flash Point: 296.2 °C
    4. Appearance: /
    5. Density: 1.31
    6. Refractive Index: 1.665
    7. Storage Temp.: N/A
    8. Solubility: N/A
    9. PKA: 10.63±0.50(Predicted)
    10. CAS DataBase Reference: Pigment Red 21(CAS DataBase Reference)
    11. NIST Chemistry Reference: Pigment Red 21(6410-26-0)
    12. EPA Substance Registry System: Pigment Red 21(6410-26-0)
  • 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: 6410-26-0(Hazardous Substances Data)

6410-26-0 Usage

Uses

Used in Plastics Industry:
Pigment Red 21 is used as a coloring agent for plastics to provide a vibrant red hue with high durability and resistance to fading, making it suitable for outdoor applications and products exposed to sunlight or high temperatures.
Used in Rubber Industry:
In the rubber industry, PR21 is utilized as a pigment to impart a consistent and long-lasting red color to rubber products, ensuring color stability even under harsh conditions.
Used in Inks:
Pigment Red 21 is used as a colorant in inks to achieve a bright red color with excellent lightfastness and resistance to chemicals, ensuring the longevity and quality of printed materials.
Used in Coatings:
In the coatings industry, PR21 serves as a pigment to provide a durable and weather-resistant red finish for various surfaces, including automotive, architectural, and industrial coatings.
Overall, Pigment Red 21 is valued for its ability to deliver a consistent, vibrant red color across different applications while maintaining its stability and resistance to environmental factors.

Check Digit Verification of cas no

The CAS Registry Mumber 6410-26-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,4,1 and 0 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 6410-26:
(6*6)+(5*4)+(4*1)+(3*0)+(2*2)+(1*6)=70
70 % 10 = 0
So 6410-26-0 is a valid CAS Registry Number.
InChI:InChI=1/C23H16ClN3O2/c24-19-12-6-7-13-20(19)26-27-21-17-11-5-4-8-15(17)14-18(22(21)28)23(29)25-16-9-2-1-3-10-16/h1-14,26H,(H,25,29)/b27-21-

6410-26-0SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 19, 2017

Revision Date: Aug 19, 2017

1.Identification

1.1 GHS Product identifier

Product name Pigment Red 21

1.2 Other means of identification

Product number -
Other names 4-[(2-Chlorophenyl)azo]-3-hydroxy-N-phenylnaphthalene-2-carboxamide

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:6410-26-0 SDS

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