Description

Hydrogen Bis[1-[(2-Hydroxy-5-Nitrophenyl)Azo]-2-Naphtholato(2-)]Chromate(1-) is a complex chromium azo dye compound, also known as C.I. Pigment Brown 29. This high-performance pigment is valued for its excellent color strength, chemical stability, and heat resistance, making it a critical component in demanding industrial applications. It is primarily sought after by manufacturers in the coatings, plastics, and specialty ink industries who require durable, high-quality brown pigments for their products.

Application

• Industrial Coatings: Used in automotive, coil, and heavy-duty machinery coatings for its weatherfastness and chemical resistance.
• Plastics Coloring: Imparts stable brown coloration to engineering plastics, masterbatches, and synthetic fibers, withstanding high processing temperatures.
• Specialty Inks: A key pigment for high-performance printing inks, including packaging and security inks, due to its color consistency.
• Construction Materials: Incorporated into colored concrete, roofing granules, and other building materials for long-lasting color.
• Artists' Colors: Used in the formulation of high-grade artists' paints and pigments where permanence is required.

Basic Information

Product Name	Hydrogen Bis[1-[(2-Hydroxy-5-Nitrophenyl)Azo]-2-Naphtholato(2-)]Chromate(1-)
CAS No.	50497-83-1
Molecular Formula	C34H22CrN6O8
Molecular Weight	694.57 g/mol
Synonyms	C.I. Pigment Brown 29; C.I. 71129; Pigment Brown 29; Chromium Complex Brown; 1-[(2-Hydroxy-5-nitrophenyl)azo]-2-naphthol chromium complex; Bis[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphtholato]chromium; Chromate(1-), bis[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphtholato(2-)]-, hydrogen
EINECS	256-634-4

Quality Control

Our production of C.I. Pigment Brown 29 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is tested against key parameters including color strength, hue, particle size distribution, and chemical purity. A comprehensive Certificate of Analysis (COA) detailing these results is provided with each shipment to support your quality assurance processes.

Storage

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

Specification

Item	Specification
Appearance	Brown powder
Identification (IR)	Conforms to standard
Color Strength	95 - 105% (vs. Std.)
Hue	Within agreed tolerance
Particle Size (D50)	< 5.0 µm
Moisture Content	< 2.0 %
Ash Content	< 1.0 %
Water Soluble Matter	< 1.5 %
Heavy Metals (as Pb)	< 50 ppm

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