Zhishang Chemical

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Zhishang Chemical

Solvent Red 24 CAS 85-83-6

Molecular Formula: C24H20N4O

Formula Weight: 380.44

ZSpharmac: Solvent Red 24 Supplier

Product Name: Solvent Red 24
CAS No: 85-83-6
Purity: 99%

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Basic Info

Product Name:Solvent Red 24
Other Names:Sudan IV
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:Red Brown Powder/Solid
EINECS No.:201-635-8
Storage:Flammables Area
Provide:Solvent Red 24 MSDS;
Solvent Red 24 COA

What is Solvent Red 24?

The chemical name of Solvent Red 24 is 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol. This variety has good weather resistance and light resistance, and the color is bright and pure , Widely used in transparent or opaque coloring of various thermoplastics; coloring of polyester, nylon, engineering materials and other plastics; coloring of polystyrene, ABS resin, polymethyl methacrylate resin, acetate fiber and polyvinyl chloride, etc. ; It can also be used for the coloring of the raw pulp of polyester fiber, and the product performance is stable.

Solvent Red 24 Property

Melting point 199 °C (dec.)(lit.)
Boiling point 260°C
density 1.1946 (rough estimate)
vapor pressure 0Pa at 25℃
refractive index 1.6000 (estimate)
storage temp. Flammables area
solubility Insoluble in water; soluble in benzene, methanol, acetone, isopropanol; slightly soluble in ethanol
form Powder/Solid
Colour Index 26105
color Red Brown
Water Solubility 23μg/L at 25℃


Solvent Red 24 Uses

  1. Solvent Red 24 is mainly used for the coloring of grease, water, soap, candles, rubber toys, and plastic products.
  2. Solvent Red 24 is mainly used in biological stains such as oil and fat stains.
  3. Solvent Red 24 is mainly used for oil and fat staining, and Sudan IV can be replaced by oil red O (oil red O); it is used in the manufacture of high-temperature thermometers.

Preparation of Solvent Red 24

A method for preparing Solvent Red 24, the specific reaction steps are as follows:

1. Single coupling reaction: Put 22g of o-toluidine and 15-20g of methanol into the reactor, add 14g of 30% hydrochloric acid dropwise at a temperature of 20-25°C, drop it in 30 minutes, cool down to 2-5°C, and add 40% nitric acid dropwise Sodium solution 16-17g, heat preservation time 3h, heat up to 20-25°C and heat preservation 2h, add 50ml of soft water, stir for 30min, start to filter, wash with normal temperature water until the pH of the filtrate is neutral, dry, and weigh.

2. Double coupling reaction: Put 0.4g of o-toluidine, 150g of soft water, and 15.6g of single coupling into the reactor, add 21g of 30% hydrochloric acid dropwise at a temperature of 20-25°C, drop it in 30 minutes, cool down to 2-5°C, drop Add 27.5g of 20% sodium nitrate solution, keep warm for 4 hours, then add 80.25g of 2-naphthol and 5% liquid caustic solution dropwise, control the temperature, after 1 hour, keep warm for 2 hours, and then use 5% liquid caustic 20g Adjust the pH, keep it warm for 3-5 hours, re-test the pH = 8, filter, and wash the filter cake with hot water until neutral. Filter the cake with 1% liquid caustic soda for 2 hours, filter, wash the filter cake with hot water until neutral, then beat the filter cake with 1% hydrochloric acid for 2 hours, filter, wash the filter cake with hot water until neutral, weigh, drying.

Biological Activity of Solvent Red 24

Solvent red 24 that enters the body is mainly metabolized by the reductases of microorganisms in the gastrointestinal tract, liver and extrahepatic tissue microsomes, and cytoplasm, and metabolized into corresponding amines in the body. In a number of in vitro mutagenic tests and animal carcinogenic tests, it was found that the mutagenicity and carcinogenicity of Sudan Red are related to the amines produced by metabolism.

About Products:
If you need Solvent Red 24 as a cosmetic raw material, please contact our service staff directly, we will provide you with high-quality products at the best price.
As an experienced Solvent Red 24 manufacturer and supplier, ZSpharmac will provide Solvent Red 24 raw materials to customers all over the world for a long time.
Over the years, the company has been adhering to the spirit of “integrity management, strict quality control, customer first”, and has won unanimous praise from domestic and foreign customers.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Cosmetic raw materials
  • Products/Service:Cosmetic raw materials (flavors and fragrances,antioxidant products, moisturizing and hydrating, whitening agents, cosmetic additives)
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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