Description

Fast Dark Blue R Salt is a high-purity diazonium salt intermediate essential for the synthesis of azo dyes and pigments. This compound is valued for its ability to impart deep, stable blue shades with excellent fastness properties in the final colorant. It is a critical raw material for manufacturers in the textile, leather, ink, and specialty chemical industries seeking to produce high-performance colorants.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, particularly those yielding dark blue hues.
• Key component in the production of textile dyes for cotton, silk, and nylon, valued for color depth and wash fastness.
• Used in formulating leather dyes to achieve consistent and vibrant coloration.
• Employed in the manufacture of printing inks for packaging and publications.
• Intermediate for paper colorants and specialty coatings.
• Used in research and development of novel functional dyes and colorimetric sensors.

Basic Information

Product Name	Fast Dark Blue R Salt
CAS No.	6709-58-6
Molecular Formula	C14H14N4O6S2
Molecular Weight	398.41 g/mol
Synonyms	Fast Blue R Salt; Variamine Blue Salt R; 4-Benzoylamino-2,5-diethoxybenzenediazonium hydrogen sulfate; 4-(Benzoylamino)-2,5-diethoxybenzenediazonium sulfate; C.I. 37240; Diazo Fast Blue R; Azoic Diazo Component 20; Fast Dark Blue R
EINECS	229-759-5

Quality Control

Our Fast Dark Blue R Salt is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. The product undergoes comprehensive analytical testing, including assay, impurity profiling, and strength verification. Certificates of Analysis (COA) documenting purity, physical characteristics, and performance data are available for every batch upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed after opening to minimize exposure to atmospheric moisture and light to maintain stability and performance.

Specification

Item	Specification
Appearance	Light beige to tan powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Moisture (KF)	≤ 2.0%
Insoluble Matter	≤ 0.5%
Diazotization Value	≥ 95%
Heavy Metals (as Pb)	≤ 20 ppm

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