Zhishang Chemical

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Sudan Ⅳ CAS 85-83-6

Molecular Formula: C24H20N4O

Formula Weight: 380.44

ZSpharmac: Sudan Ⅳ Raw Material Supplier

Product Name: Sudan Ⅳ
CAS No: 85-83-6
Purity: 99%

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Basic Info

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

What is Sudan Ⅳ?

Solvent Red 24, also known as 1-(2-methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol, is a chemical with good weather and light resistance. It is widely used in coloring various thermoplastic plastics, including transparent and opaque varieties. This solvent is also used for coloring polyester, nylon, and engineering materials, as well as polystyrene, ABS resin, polymethyl methacrylate resin, acetate fiber, and polyvinyl chloride. Additionally, it can be used to color the original pulp of polyester fiber, and it provides stable product performance.

Sudan Ⅳ 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℃


Sudan Ⅳ Uses

  1. Sudan IV is commonly utilized as a coloring agent in various products including grease, water, soap, candles, rubber toys, and plastic items.
  2. Sudan IV is also used as a biological stain for oil and fat.
  3. Additionally, it can be substituted with oil red O, which is used in the production of high-temperature thermometers.

Sudan IV Preparation

To prepare Sudan IV, the following steps are followed:

1. Single coupling reaction: In a reactor, 22g of o-toluidine and 15-20g of methanol are combined. Then, 14g of 30% hydrochloric acid is added dropwise at 20-25°C over 30 minutes. The mixture is then cooled to 2-5°C and 16-17g of sodium solution is added dropwise. The reaction is allowed to proceed for 3 hours at room temperature, followed by an additional 2 hours at 20-25°C. After adding 50ml of soft water and stirring for 30 minutes, the mixture is filtered and washed with water until neutral pH is achieved. The resulting product is then dried and weighed.

2. Double coupling reaction: In a reactor, 0.4g of o-toluidine, 150g of soft water, and 15.6g of the product from the single coupling reaction are combined. Then, 21g of 30% hydrochloric acid is added dropwise at 20-25°C over 30 minutes. The mixture is cooled to 2-5°C and 27.5g of 20% sodium nitrate solution is added, followed by 80.25g of a mixed solution of 2-naphthol and 5% liquid alkali. The reaction is controlled at a specific temperature and allowed to proceed for specific time periods. After adjusting the pH and filtering, the filter cake is washed and treated with liquid soda and hydrochloric acid, then dried and weighed.

Contact Us

About Products:
If you need Sudan IV, a cosmetic raw material, please contact our service staff directly, and we will provide you with high-quality products at the best price.
Our company, as an experienced Sudan IV manufacturer and supplier, ZSpharmac will provide Sudan IV raw materials to customers around the world for a long time.
Over the years, the company has adhered to the spirit of “integrity management, strict quality control, and customer first” and has won unanimous praise from customers at home and abroad.

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.

Get Sudan Ⅳ Quotation