Description

C.I. Disperse Red 131 is a high-performance, monoazo-based disperse dye widely used in synthetic fiber coloration. Its primary value lies in providing a bright, strong red shade with excellent fastness properties, particularly on polyester and its blends. This product is essential for textile manufacturers and dye houses seeking reliable, consistent colorants for demanding applications. The compound is identified by CAS No. 12236-24-7.

Application

• Primary dyeing and printing of polyester (PET) fibers and filaments.
• Coloration of polyester-cotton and polyester-wool blended fabrics.
• Used in the high-temperature dyeing process for automotive and home furnishing textiles requiring high colorfastness.
• Applicable for the batch and continuous dyeing of textured polyester yarns.
• Potential use in the coloration of specific acetate and nylon fibers, depending on formulation.
• Employed in the production of masterbatches for mass coloration of synthetic polymers.

Basic Information

Product Name	C.I. Disperse Red 131
CAS No.	12236-24-7
Molecular Formula	C18H15ClN4O4
Molecular Weight	386.79 g/mol
Synonyms	Disperse Red 131; Disperse Red SE-4B; C.I. 62015; 1-Amino-2-phenoxy-4-hydroxyanthraquinone; 1-Amino-4-hydroxy-2-phenoxyanthraquinone; Samaron Red FBL; Foron Red SE-4B; Dianix Red FBL
EINECS	235-428-6

Quality Control

Our C.I. Disperse Red 131 is manufactured under a stringent quality management system. Every batch is tested against rigorous internal specifications to ensure consistent shade, strength, and dispersion stability. Key parameters such as color strength, particle size distribution, and fastness properties are verified. A Certificate of Analysis (COA) detailing these results is provided with each shipment to guarantee product integrity and performance.

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 strong oxidizing agents. Under these conditions, the product has a long shelf life.

Specification

Item	Specification
Appearance	Reddish-brown powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Particle Size (≥ 2μm)	≤ 5.0%
Dispersion Stability	Grade 4-5
pH (Aqueous Dispersion)	6.0 - 8.0

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