1-(2-Chloro-4-nitrophenylazo)-2-naphthol
CAS 2814-77-9
EC 220-562-2
Formula C16H10ClN3O3
MW 327.72 g/mol
Pigments & Colorants Textile, Leather & PaperPrinting & PackagingPlastics & PolymersCoatings, Adhesives, Sealants & Elastomers Surface Modification & Wetting
Description
1-(2-Chloro-4-nitrophenylazo)-2-naphthol, commercially known as Pigment Red 4, C.I. 12085, or Blazing Red, is a monoazo pigment registered under CAS 2814-77-9 and EC 220-562-2. It carries no E-code designation, indicating it is not approved for food or cosmetic use.
In printing inks and packaging coatings, Pigment Red 4 delivers strong red hues through its azo chromophore structure, which absorbs light selectively in the blue-green region. In plastics and textile applications, its surface-active character promotes pigment dispersion and substrate wetting, improving color uniformity and adhesion across polymer matrices and fiber substrates.
This pigment is supplied as a powder or crystalline solid and falls under HS code 3204.17.0485 for customs classification. It is subject to REACH registration requirements within the EU. Procurement teams should confirm supplier documentation for REACH compliance and request safety data sheets prior to formulation trials.
In printing inks and packaging coatings, Pigment Red 4 delivers strong red hues through its azo chromophore structure, which absorbs light selectively in the blue-green region. In plastics and textile applications, its surface-active character promotes pigment dispersion and substrate wetting, improving color uniformity and adhesion across polymer matrices and fiber substrates.
This pigment is supplied as a powder or crystalline solid and falls under HS code 3204.17.0485 for customs classification. It is subject to REACH registration requirements within the EU. Procurement teams should confirm supplier documentation for REACH compliance and request safety data sheets prior to formulation trials.
Physical Properties
| Boiling Point | 558.9±50.0 °C(Predicted) |
| Density | 1.4414 (rough estimate) |
| Color | Orange to Brown |
| Form | powder to crystal |
| Refractive Index | 1.6470 (estimate) |
| Log P | 5.252 (est) |
Safety & Handling (Learn More)
Warning GHS07
H
H319H413
P
P273P280P501P264+P265P337+P317P305+P351+P338
Trade & Regulatory
| HS Code | 3204.17.0485 |
Other Names
1-[(2-chloro-4-nitrophenyl)diazenyl]naphthalen-2-olD&c Red No. 3612094red12094 RedC.I. 12085Blazing RedPigment Red 4PERMANENT RED 2B
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Raw Materials
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