Pigment Red 3 Chemical Properties

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)

Water Solubility 

211μg/L at 20℃

Stability:

Stable. May be moisture sensitive. Incompatible with strong oxidizing agents.

Cosmetics Ingredients Functions

COLORANT

LogP

5.4 at 25℃

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

Hazard Codes 

Xi,N

Risk Statements 

41-50/53

Safety Statements 

26-39-60-61

RIDADR 

UN 3077 9/PG 3

WGK Germany 

3

RTECS 

QK4247000

TSCA 

TSCA listed

Hazardous Substances Data

2425-85-6(Hazardous Substances Data)

MSDS

• Language:English Provider:Pigment Red 3

Pigment Red 3 Usage And Synthesis

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

Uses

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

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

Synthesis

Using the coupling component 2-naphthol in acidic or neutral pH aqueous solution, at a temperature of 65 ?? C or below the characteristics of low solubility, so that the coupling reaction of diazoxide and 2-naphthol in below 65 ?? C conditions, the pH value of the control of 2 ~ 9, and then the unreacted 2-naphthol in the form of reactant crystals precipitation, and then the coupling reaction to prepare toluidine red.

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 %

Pigment Red 3(2425-85-6)Related Product Information

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