Overview
Para Red, chemically known as 1-[(4-nitrophenyl)azo]-2-naphthol, is a synthetic azo dye first synthesized in the late 19th century. It belongs to the class of nitroaniline dyes and is valued for its vibrant red hue and stability in various applications. Primarily used in the textile industry, Para Red is also employed in printing inks, plastics, and coatings. Its popularity stems from its excellent lightfastness and resistance to alkalis, making it suitable for industrial use.
Physical and Chemical Properties
Para Red appears as a red crystalline powder with a molecular weight of 293.28 g/mol. It is insoluble in water but dissolves readily in organic solvents such as ethanol and acetone. The dye decomposes at around 250°C, limiting its use in high-temperature applications. Key chemical properties include its azo group (-N=N-), which contributes to its color, and the nitro group (-NO2), which enhances its stability. These functional groups make Para Red resistant to fading under UV light and alkaline conditions.
Main Applications
Para Red is predominantly used in the textile industry for dyeing cotton, silk, and synthetic fibers. Its bright red shade and durability make it a preferred choice for fabrics intended for outdoor use. In addition to textiles, Para Red is utilized in printing inks for packaging and publications. It is also incorporated into plastics and coatings to provide color stability and resistance to environmental factors.
Safety and Storage
Para Red poses health risks if ingested or inhaled, causing irritation to the skin, eyes, and respiratory tract. Proper handling requires the use of gloves, goggles, and masks, along with adequate ventilation in workspaces. Storage recommendations include keeping the dye in a cool, dry place, away from direct sunlight and oxidizing agents. Containers should be tightly sealed to prevent moisture absorption and contamination.
B2B Procurement Guide
When procuring Para Red, buyers should verify the CAS number (6410-10-2) and request detailed specifications, including purity levels and impurity profiles. Reputable suppliers should provide Safety Data Sheets (SDS) and compliance certificates for regulatory standards. Price negotiation should consider bulk purchase discounts, with typical rates ranging from $10 to $20 per kilogram. Buyers are advised to sample test the product for consistency in color and performance before large-scale orders.
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