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Solvent Red 24

Name: Solvent Red 24
SKU: 0

Basic Information

CAS No.: 85-83-6
Molecular Formula: C24H20N4O
Molecular weight: 380.44

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Product Details

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

Property	Value
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

Property	Value
Hazard symbols	Xi, T
Hazard class codes	36/38-45
Safety descriptions	26-36-53-45
WGK Germany	3
RTECS number	QL5775000
TSCA	TSCA listed
Hazard class	IRRITANT
HS code	32129000
Storage class	11 - 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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Solvent Red 24

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