Solvent Red 24

Solvent Red 24

CAS No.: 85-83-6
Molecular Formula: C24H20N4O
Molecular weight: 380.44
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product description
Solvent Red 24, also known as Sudan Red Ⅳ, oil soluble red, light red, etc., is chemically 1-(2-methyl-4 -(2-methylphenylazo) phenylazo) -2-naphthol, belonging to the azo dyes with molecular formula C24H20N4O and molecular weight 380.44. The product has good resistance to light, bright and pure color, widely used in a variety of thermoplastic coloring, can also be used for polyester fiber pulp coloring, paint and ballpoint ink coloring


Chemical Properties

PropertyValue

Melting point

199 °C (dec.)(lit.)

Boiling point

260°C

Density

1.1946 (rough estimate)

Vapor pressure

0Pa at 25℃

Refractive index

1.6000 (estimate)

Storage temp.

Flammables area

Solubility

Insoluble in water; soluble in benzene, methanol, acetone, isopropanol; slightly soluble in ethanol

Pka

13.52±0.50(Predicted)

Colour Index

26105

Form

Powder/Solid

Color

Red Brown

Water Solubility

23μg/L at 25℃

ε(extinction coefficient)

≥12000 at 356-360nm in toluene at 0.008g/L≥26000 at 519-523nm in toluene at 0.008g/L

λmax

520 nm, 357 nm

Merck

14,8393

BRN

709018

Stability

Stable. Incompatible with strong oxidizing agents.

Biological Applications

Detecting atherosclerosis; diapers; skin care products; shampoos; hair colors; stents; dental impression materials

InChIKey

RCTGMCJBQGBLKT-PAMTUDGESA-N

LogP

6.66

IARC

3 (Vol. 8, Sup 7) 1987

NIST Chemistry Reference

O-tolylazo-o-tolylazo-beta-naphthol(85-83-6)

EPA Substance Registry System

C.I. Solvent Red 24 (85-83-6)


Safety Information

PropertyValue
Hazard symbolsXi, T
Hazard class codes36/38-45
Safety descriptions26-36-53-45
WGK Germany3
RTECS numberQL5775000
TSCATSCA listed
Hazard classIRRITANT
HS code32129000
Storage class11 - Combustible solids
Hazard class (category)Skin sensitization, Category 1A


Product Usage

Solvent Red 24, also known as Sudan IV, is a versatile oil-soluble azo dye valued for its intense red brightness and excellent solubility in non-polar environments. In the petroleum industry, it is a critical diagnostic tool used to color-code fuels, lubricants, and heating oils for grade identification and tax compliance (such as "red diesel"). Its exceptional thermal stability and compatibility make it a preferred choice in the plastics industry for the transparent coloration of thermoplastic resins like PS, ABS, and PMMA. Additionally, it is widely employed in the wax and coating sectors for manufacturing colored candles, shoe polishes, and solvent-based printing inks. In biomedical research, it serves as a specialized biological stain for identifying lipids and triglycerides in tissue sections.

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