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Solvent Red 23

Updated: 2026-07-23

Overview

Solvent Red 23 is an azo dye widely used in industrial applications due to its vibrant red color and chemical stability. It belongs to the Sudan dye family and is known for its solubility in organic solvents, making it a preferred choice for non-aqueous systems. First synthesized in the early 20th century, Solvent Red 23 has become a staple in industries requiring durable and consistent coloration. Its molecular structure includes azo groups (-N=N-), which contribute to its intense hue and resistance to fading under normal conditions.

Physical and Chemical Properties

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Solvent Red 23 appears as a reddish-brown powder with a molecular weight of 380.44 g/mol. It is soluble in organic solvents such as ethanol, acetone, and toluene but exhibits negligible solubility in water. The dye has a melting point range of 130-140°C, though it decomposes at higher temperatures rather than boiling. Key chemical properties include high color strength and excellent lightfastness, making it suitable for applications exposed to sunlight. Its stability in non-polar environments allows for consistent performance in plastics and waxes, where other dyes might migrate or degrade.

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Main Applications

Solvent Red 23 is primarily used in the manufacturing of inks, particularly for printing on non-porous materials like plastics and metals. Its compatibility with organic solvents ensures uniform dispersion and vivid coloration. In the plastics industry, it is employed to color products such as PVC, polystyrene, and polyethylene. The textile sector uses it for dyeing synthetic fibers, while the wax industry incorporates it for coloring candles and polishes. Its versatility and durability make it a preferred choice for these applications.

Safety and Storage

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While Solvent Red 23 is not classified as highly hazardous, precautions should be taken to avoid inhalation or skin contact. Proper PPE, including gloves and masks, is recommended during handling. The dye should be stored in a cool, dry place, away from direct sunlight and oxidizing agents to prevent degradation. In case of accidental exposure, rinse affected areas with water and seek medical advice if irritation persists. Spills should be contained and cleaned with appropriate absorbents, avoiding dispersal into waterways due to potential environmental impact.

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B2B Procurement Guide

When procuring Solvent Red 23, verify the CAS number (85-86-9) to ensure product authenticity. Purity specifications should align with your application requirements, typically ranging from 95% to 99%. Reputable suppliers will provide certificates of analysis (CoA) and material safety data sheets (MSDS). Price varies based on quantity and purity, with bulk purchases often discounted. Consider suppliers with ISO or REACH certifications to guarantee quality and regulatory compliance. Sampling before large-scale procurement is advisable to confirm performance in your specific application.

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