Description

C.I. Solvent Red 33 CAS NO 73297-03-7 is a high-purity, oil-soluble azo dye renowned for its vibrant red hue and excellent solubility in non-polar organic media. This solvent dye is engineered to deliver consistent color strength and superior lightfastness in demanding industrial applications. It is an essential coloring agent for manufacturers in the plastics, inks, coatings, and fuel industries seeking reliable and stable pigmentation.

Application

• Plastics and Polymers: Used for coloring polystyrene (PS), acrylics (PMMA), polycarbonate (PC), and other engineering plastics, providing excellent dispersion and thermal stability during processing.
• Printing Inks: A key component in solvent-based inks for flexographic and gravure printing, offering brilliant color and good printability on various substrates.
• Industrial Coatings and Paints: Imparts durable and vivid red coloration to automotive refinish paints, industrial maintenance coatings, and wood stains.
• Fuel and Lubricant Marking: Employed as a dye for gasoline, heating oil, and lubricants for identification and differentiation purposes.
• Waxes and Polishes: Used to color candles, shoe polishes, and floor waxes, ensuring color uniformity and stability.
• Wood Stains and Varnishes: Provides transparent, penetrating color for wood finishing applications.
• Specialty Chemicals: Serves as a colorant in various chemical formulations requiring oil-soluble dyes.

Basic Information

Product Name	C.I. Solvent Red 33
CAS No.	73297-03-7
Molecular Formula	C24H20N4O
Molecular Weight	380.44 g/mol
Synonyms	Solvent Red 33; C.I. 11270; Oil Red 2355; 1-[[4-(Phenylazo)phenyl]azo]-2-naphthalenol; Ceres Red BB; Aizen SOT Red 1; Sudan Red 2355; Red 33 (Solvent); 1-[(E)-[4-[(E)-Phenyldiazenyl]phenyl]diazenyl]naphthalen-2-ol
EINECS	Contact for details

Quality Control

Our C.I. Solvent Red 33 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for color strength, purity, and solubility. A Certificate of Analysis (COA) documenting key parameters is provided with each shipment to guarantee consistency and traceability for our global B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark Red Powder or Crystals
Identification (IR)	Conforms to Standard
Color Strength	100 ± 3% (vs. Standard)
Assay (HPLC)	≥ 98.0%
Solubility (in Toluene)	Complete, Clear Solution
Moisture Content (KF)	≤ 0.5%
Ash Content	≤ 0.5%
Lightfastness	Good to Very Good

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.