Pigment Red 3

Synonym(s):Pigment Red 3

CAS NO.：2425-85-6
Empirical Formula: C17H13N3O3
Molecular Weight: 307.3
MDL number: MFCD00003910
EINECS: 219-372-2
SAFETY DATA SHEET (SDS)
Update Date: 2025-12-17 09:50:03

What is Pigment Red 3?

Description

C.I. Pigment Red 3, 12120 [2425-85-6] is a good representative of monoazopigments of the β-naphthol type and is one of the most important organic pigments.

Chemical properties

red to orange powder

The Uses of Pigment Red 3

Toluidine Red is a oil soluble dye. Toluidine Red has been shown to cause hematopoietic cell proliferation in the spleen, liver, and bone marrow of rats. Dyes and metabolites, Environmental Testing

What are the applications of Application

Pigment red 3 is a cell proliferation activator

Definition

ChEBI: CI Pigment Red 3 is a member of azobenzenes.

General Description

Yellowish-red to red powder or solid.

Air & Water Reactions

Sensitive to moisture Dust suspensions in air can be explosive at certain concentrations. Insoluble in water.

Reactivity Profile

Pigment Red 3 may form toxic gases with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. May form flammable gases with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.

Fire Hazard

Flash point data for Pigment Red 3 are not available; however, Pigment Red 3 is probably combustible.

Flammability and Explosibility

Non flammable

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	DARK RED POWDER
SHADE	BLUISH
HEAT RESISTANCE	140 °C min
LIGHT FASTNESS	7
ACID RESISTANCE	5
ALKALI RESISTANCE	5
FASTNESS TO BLEEDING	4
OIL ABSORPTION	40-45%
SPECIFIC SURFACE	28 m ² /g
DENSITY	1.60 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 Red 3

Melting point:	270-272 °C(lit.)
Boiling point:	447.81°C (rough estimate)
Density	1.1873 (rough estimate)
refractive index	1.6500 (estimate)
solubility	Chloroform (Slightly, Heated), DMSO (Slightly), Toluene (Very Slightly)
Colour Index	12120
pka	13.45±0.50(Predicted)
form	neat
Water Solubility	211μg/L at 20℃
Stability:	Stable. May be moisture sensitive. Incompatible with strong oxidizing agents.
CAS DataBase Reference	2425-85-6(CAS DataBase Reference)
NIST Chemistry Reference	2-Naphthalenol, 1-[(4-methyl-2-nitrophenyl)azo]-(2425-85-6)
IARC	3 (Vol. 57) 1993
EPA Substance Registry System	C.I. Pigment Red 3 (2425-85-6)

Safety information for Pigment Red 3

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Environment GHS09
GHS Hazard Statements	H318:Serious eye damage/eye irritation H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P501:Dispose of contents/container to..…