Pigment Orange 5

Synonym(s):1-[(2,4-Dinitrophenyl)azo]-2-naphthol;Permanent red 2G

CAS NO.：3468-63-1
Empirical Formula: C16H10N4O5
Molecular Weight: 338.27
MDL number: MFCD00059524
EINECS: 222-429-4
SAFETY DATA SHEET (SDS)
Update Date: 2026-04-10 10:27:18

What is Pigment Orange 5?

The Uses of Pigment Orange 5

Permanent Orange (cas# 3468-63-1) is a useful research chemical. Dyes and metabolites, Environmental Testing.

General Description

Pigment orange 5 is an azo pigment, which can be produced industrially by a diazotization and coupling sequence in which diazotized dinitroaniline is coupled into β-naphthol.

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	ORANGE POWDER
SHADE	YELLOWISH
HEAT RESISTANCE	140 °C min
LIGHT FASTNESS	7
ACID RESISTANCE	5
ALKALI RESISTANCE	5
FASTNESS TO BLEEDING	5
OIL ABSORPTION	35-40%
SPECIFIC SURFACE	30 m ² /g
DENSITY	1.50 g/cm ³
RESIDUE ON 80 MESH	5.0% max
WATER SOLUBLE	1.0% max
VOLATITE 105 °C	1.0% max
TINTING STRENGTH	100-105 %

Properties of Pigment Orange 5

Melting point:	306°C(lit.)
Boiling point:	474.44°C (rough estimate)
Density	1.3138 (rough estimate)
refractive index	1.6300 (estimate)
storage temp.	Amber Vial, -20°C Freezer
solubility	Chloroform (Very Slightly), Tetrahydrofuran (Slightly, Heated)
form	Solid
Colour Index	12075
pka	13.45±0.50(Predicted)
color	Orange to Dark Red
BRN	964718
CAS DataBase Reference	3468-63-1(CAS DataBase Reference)
EPA Substance Registry System	C.I. Pigment Orange 5 (3468-63-1)

Safety information for Pigment Orange 5

Signal word	Warning
Pictogram(s)	Health Hazard GHS08
GHS Hazard Statements	H341:Germ cell mutagenicity H351:Carcinogenicity
Precautionary Statement Codes	P281:Use personal protective equipment as required.