Solvent Red 111 / Solvent Dyes

CAS No.: 82-38-2

Molecular formula: C₁₅H₁₁NO₂

Advantages: Exceptional heat resistance,Excellent light resistance,Superior migration resistance, High tinting strength

Applications: Coloring plastics, including PS, ABS, PMMA, and other polymers, Coloring rubber, wax, oil, lubricants, fuels, gasoline, and candles

Solvent Red 111 (CAS 82-38-2) is a high-performance fluorescent red dye engineered for demanding industrial coloring applications. With a naphthalimide-based molecular structure (C₁₅H₁₁NO₂), this solvent dye delivers vivid red fluorescence combined with outstanding thermal stability — sustaining temperatures up to 300°C in polystyrene, ABS, SAN, PMMA, and polycarbonate without color degradation.

In plastics processing, Solvent Red 111 excels where conventional red dyes fall short. Its migration resistance rating of 5/5 across all major polymer systems means zero color bleeding during injection molding, extrusion, or thermoforming — a critical requirement for multi-layer packaging and automotive interior components. The dye achieves Grade 6-7 lightfastness at minimal 0.05% loading in transparent formulations, making it cost-effective for high-volume production runs. Typical applications include consumer electronics housings, automotive dash panels, household appliance components, and specialty fuel marking where traceability and visual identification are essential.

Compared to similar red fluorescent dyes like Solvent Red 135 or Solvent Red 179, Solvent Red 111 offers a distinctive balance of higher heat resistance (300°C vs. 260-280°C) and superior migration performance, making it the preferred choice for engineering plastics processed at elevated temperatures.

Description

Solvent Red 111 is a vibrant red fluorescent dye.

It has excellent heat resistance and light resistance, good migration resistance and high tinting strength with wide application.

Solvent Red 111 is used for coloring for plastics, PS, ABS, PMMA, polymer. Also can be used for coloring for rubber, wax, oil, lubricant, fuel, gasoline, candle.

Identification Information:

Color Index: Solvent red 111

CAS No.: 82-38-2

Molecular formula: C₁₅H₁₁NO₂

Product specification

Appearance Red powder

Tinting Strength 100±3%

Shade Color Similar to the standard,

Ash ≤ 0.5%

Moisture ≤ 0.5%

Color Differential ValueΔE ≤ 0.8

Density g/cm3 1.36

Melting Point ℃ 169-172

Technical Data

Test Items	PS	ABS	SAN	PMMA	PC	R-PVC	PA6	PET
Heat resistance temperature, ℃ (0.05% dyes, transparent)	300	300	300	300	300	–	–	–
Heat resistance temperature, ℃ (0.05% dyes + 1.0% Titanium dioxide)	300	300	300	300	300	–	–	–
Migration resistance	5	5	5	5	5	5	5	5
Light fastness (0.05% dyes, transparent)	6-7	6-7	–	–	–	6-7		–
Weather resistance	–	–	–	–	–	–	–	–
Acid resistance (in 5% hydrochloric acid solution)	–	–	–	–	–	5	–	–
Alkali resistance (in 5% caustic soda solution)	–	–	–	–	–	5	–	–

Solvent yellow 160 solubility in organic solvent at 20℃(g/l)

Acetone	Butyl Acetate	Methylbenzene	Dichloromethane	Ethylalcohol
4	4	7	32	2

Technical Parameter Interpretation

Heat Resistance (300°C in PS/ABS/SAN/PMMA/PC): This rating indicates the maximum processing temperature at which Solvent Red 111 maintains its color integrity for 5 minutes at 0.05% concentration. At 300°C, this dye outperforms most competing red solvent dyes, making it suitable for high-temperature engineering plastics like polycarbonate and high-heat ABS grades used in automotive and electronics applications.

Migration Resistance (Grade 5/5): Rated on a 1-5 scale where 5 is the best, this rating confirms that Solvent Red 111 will not bleed or migrate within the polymer matrix during or after processing. This is essential for multi-layer structures, food-contact packaging, and applications where color purity in adjacent layers must be maintained.

Lightfastness (Grade 6-7): Measured on the Blue Wool Scale (1-8, where 8 is exceptional), this rating means Solvent Red 111 exhibits very good to excellent resistance to fading under prolonged light exposure. This makes it suitable for products with extended indoor service life and moderate outdoor exposure requirements.

Density (1.36 g/cm³): This moderate density ensures uniform dispersion during melt processing without settling or stratification in the polymer melt, contributing to consistent color distribution throughout the molded part.

Melting Point (169-172°C): The relatively low melting point allows the dye to dissolve rapidly in polymer melts during extrusion and injection molding, ensuring complete color development without requiring extended residence times or excessive shear energy.

Application

PS	●	PET	–	PC	●
AS	○	PVC- R	○	SAN	○
ABS	●	PVC-U	●	HIPS	●
PMMA	●	PA6	–

Note: ● = recommended ○ = potential use – = not recommended

Recommended Dosage

Transparent: 0.05%

Non-transparent: 0.08%

Packaging:

Regular Packaging is in 20kgs paper carton, 360kgs/Pallet.

Unmatched Versatility for Coloring Applications

Our advanced colorant solution is designed to meet a wide range of industrial coloring demands, offering superior versatility and performance. Whether you’re working with plastics like PS, ABS, PMMA, or other polymers, or aiming to add vibrant hues to rubber, wax, oils, lubricants, fuels, gasoline, or candles, this product delivers exceptional results tailored to your needs.

Powerful Coloring for Plastics and Polymers

When it comes to plastics, consistency and durability are key. Crafted to provide vivid, long-lasting coloration, this product excels in coloring PS (Polystyrene), ABS (Acrylonitrile Butadiene Styrene), and PMMA (Polymethyl Methacrylate). It’s engineered to seamlessly integrate into various polymer formulations, ensuring stability while maintaining product integrity. Whether you’re manufacturing consumer goods, automotive parts, or industrial materials, this colorant sets a new standard in quality and reliability.

Diverse Applications in Rubber, Wax, Oil, and More

Beyond plastics, this colorant showcases its adaptability by effectively coloring rubber materials used in industries such as automotive and construction. Its utility extends further to wax products, oils, lubricants, fuels, and even gasoline, ensuring consistent performance across these diverse applications. For those in the candle-making industry, its robust properties provide vibrant and evenly distributed colors, elevating candle aesthetics to the next level.

Why Choose This Colorant?

The advantages of using this colorant are as robust as its properties. It is specifically formulated to perform across a slew of applications, catering to industrial and consumer needs alike. Its reliability, vivid pigmentation, and seamless integration make it the perfect choice for businesses looking to enhance the visual appeal and functionality of their products. With this colorant, you’re choosing a solution that redefines efficiency and quality.