Description

C.I. Solvent Red 138 is a high-performance, oil-soluble red dye belonging to the anthraquinone chemical class. This product is valued for its excellent solubility in non-polar organic solvents and its strong, vibrant color, providing critical performance in demanding industrial applications. It is primarily sought after by manufacturers in the plastics, synthetic fibers, and specialty ink industries for its stability and coloring power.

Application

• Plastics Coloring: A key colorant for polystyrene (PS), polycarbonate (PC), and other engineering plastics requiring high-temperature processing stability.
• Synthetic Fibers: Used in the mass coloration of polyester and polyamide fibers to achieve deep, uniform shades with excellent lightfastness.
• Specialty Inks: Formulated into solvent-based inks for applications such as foil stamping, metal decoration, and specialty packaging.
• Waxes and Polishes: Imparts color to industrial waxes, shoe polishes, and automotive care products.
• Wood Stains and Coatings: Provides transparent, penetrating color in solvent-borne wood finishing systems.
• Lubricants and Greases: Used as an identification marker or tracer in industrial lubricants and functional fluids.

Basic Information

Product Name	C.I. Solvent Red 138
CAS No.	61931-54-2
Molecular Formula	C24H20N2O2
Molecular Weight	368.43 g/mol
Synonyms	Solvent Red 138; 1,4-Bis[(2-methylphenyl)amino]anthraquinone; 1,4-Bis(o-tolylamino)anthraquinone; C.I. 564120; Oil Red 5B; Macrolex Red 5B; Ceres Red 5B; Sumiplast Red 5B
EINECS	263-333-9

Quality Control

Our production of C.I. Solvent Red 138 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed against key specifications for color strength, hue, and purity. Certificates of Analysis (COA) documenting these results are provided with every shipment to support your quality assurance processes.

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. Under these conditions, the product maintains its specified properties.

Specification

Item	Specification
Appearance	Dark red powder or granules
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Hue	Within agreed tolerance
Purity (HPLC)	≥ 98.0%
Solubility (in Toluene)	Complete, clear solution
Moisture Content	≤ 0.5%
Ash Content	≤ 0.5%

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