Zhishang Chemical

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Zhishang Chemical

Magnesium Stearate Usp CAS 557-04-0

Molecular Formula: C36H70MgO4

Formula Weight: 591.24

ZSpharmac: Magnesium Stearate Usp Supplement

Product Name: Magnesium Stearate Usp
CAS No: 557-04-0
Purity: 99%

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Basic Info

Product Name:Magnesium Stearate Usp
Other Names:Magnesium Stearate, Tech.
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:White Fine Powder
EINECS No.:209-150-3
Storage:Inert Atmosphere,Room Temperature
Provide:Magnesium Stearate Usp MSDS;
Magnesium Stearate Usp COA

What is Magnesium Stearate Usp?

Magnesium stearate is actually a salt consisting mainly of stearic and palmitic acids, with small amounts of other fatty acids and some free stearic acid. The Pharmacopoeia requires at least 40% stearic acid and at least 90% combined stearic acid and palmitic acid, with stearic acid often ranging from 40% to 80%. Free stearic acid levels are typically less than 3%, but can be as low as 0.5%.

Magnesium stearate is available in several different forms, amorphous and crystalline hydrate formed upon absorption of water. Magnesium stearate has three hydrates: monohydrate, dihydrate and trihydrate. Most commercially available mixtures of amorphous and crystalline hydrates. It is difficult to determine which component is necessary for magnesium stearate as a lubricant with this variation in the combination form, the composition itself may be the most important. Due to changes in chemical composition, in order to ensure the consistency of magnesium stearate, it is necessary to control the source of materials and process variables during the preparation process.

Magnesium Stearate Usp Property

Melting point 200 °C (lit.)
density 1.028g/cm3
storage temp. Inert atmosphere,Room Temperature
solubility alcohol: insoluble
form Fine Powder
color White
PH7 (H2O) (slurry)
Water Solubility Insoluble


Magnesium Stearate Usp Uses

  1. Magnesium stearate is utilized as warm stabilizer for polyvinyl chloride, lubricant for ABS, amino material, phenolic material and also urea-formaldehyde material, paint additive.
  2. Magnesium stearate is used in perfumery, cosmetics, and also as a drier for paints and also lacquers.
  3. Magnesium stearate is utilized as an anticaking representative; mold launch agent; emulsifier.
  4. Magnesium stearate is utilized as a warm stabilizer for polyvinyl chloride, and as a resources for aesthetic flour, emollient ointment and pharmaceutical tablet computers (excipients, lubricating substances); made use of in school wood powder to make it smooth, intense and also transparent; It is made use of as a transparent flattening representative in the paint sector. The metal soaps made use of as polyvinyl chloride stabilizers are mostly higher fatty acid salts of cadmium, barium, calcium, zinc, and magnesium, as well as the bases are salts of stearic acid and lauric acid. The efficiency of steel soap stabilizers differs with the type of metal as well as acid radical., the lead soap is in the middle. Climate resistance: cadmium, zinc, lead, barium, tin soap are better. Processability: The lubricity of lead and cadmium soap is excellent, however the acid radical also has a fantastic impact on the lubricity. Regarding the same metal is worried, aliphatic is far better than aromatic, as well as the longer the molecular chain in the aliphatic acid radical, the much better the lubricity. Lead and also cadmium soaps are extremely hazardous and have sulfur air pollution. Calcium and zinc soaps are commonly made use of in safe solutions; barium and zinc soaps are commonly utilized in sulfide-resistant solutions. Magnesium stearate can be regarded as safe, as well as is allowed to be made use of in food-contact items in the USA, Germany and Japan, however it is not widely used as a warmth stabilizer for polyvinyl chloride. This species is had in the Chinese Pharmacopoeia and also a few other national pharmacopoeia, and the web content of magnesium, moisture, heavy metals, iron, sulfate as well as chloride is specified in the pharmacopoeia.

Magnesium Stearate Properties

Stearic acid is obtained from animal fats or vegetable oils and is a magnesium salt formed by treatment with magnesium oxide, magnesium carbonate or magnesium hydroxide. Fat-derived stearic acid is obtained by hydrolysis of fat under high temperature and high pressure followed by distillation. It can also be obtained by treating the fat with sodium hydroxide to remove the by-product glycerol, and then treating it with hydrochloric acid or sulfuric acid. Stearic acid derived from vegetable oil is obtained by hydrogenation. In the past, animal fats were commonly used to produce stearic acid, but since the advent of mad cow disease, animal-derived materials have been largely replaced by plant-derived materials.

Magnesium stearate is a fine white powder with smooth touch, small bulk density, light and fluffy, absorbent and poor fluidity, insoluble in water, ethanol and ether. Although magnesium stearate is relatively stable, it can react with oxidizing agents, strong acids, alkali metals and metal salts, as well as with aspirin, some vitamins and alkaloid salts. Magnesium stearate is generally considered safe and nontoxic, and it is listed in the FDA’s Inactive Ingredient Guidelines for use in oral tablets, capsules and powders, buccal and vaginal tablets, and topical formulations.

Physical Properties of Magnesium Stearate

Due to the uncertain chemical composition of magnesium stearate, magnesium stearate has different physical properties, which affect its lubricating function. This includes particle size, particle morphology, moisture content, density and specific surface area.

The average particle size of magnesium stearate on the market is less than 5 to 10 microns, and it can also be as low as 1 micron in average particle size and as high as 20 microns in average particle size. Generally, the smaller the particle size, the lower the bulk density, so monitoring the change in bulk density of magnesium stearate from batch to batch is a cost-effective way to monitor the change in particle size.

One of the reasons why magnesium stearate can be used as a lubricant is because of its platelet-like crystal shape. These lamellar crystal structures are layered together and separated during the mixing process to coat individual particles or device surfaces. While stacked lamellar crystal shapes are more common, circular and even needle-like shapes also exist. The trihydrate is a needle-shaped particle with significantly reduced lubricity compared to other particle forms. It should be noted that all forms of magnesium stearate can be converted to trihydrate under high humidity conditions.

Commercial batches of magnesium stearate are a mixture of amorphous and crystalline hydrates. After the anhydrous absorbs moisture under ambient humidity, the water content reaches 3% to 4%, and most of the water is weakly bound inside the crystal lattice. Anhydrous will have obvious hygroscopicity when the relative humidity is above 80%. The Pharmacopoeia specifies that the loss on drying of magnesium stearate is less than 6%, and changes in the loss on drying may lead to a decrease in lubricity.

The bulk density of commercial grade magnesium stearate is generally between 0.15g/cm3 and 0.30g/cm3. Using magnesium stearate with a 2-fold difference in bulk density as a lubricant may produce different final products. You can use bulk density to determine the particle size and specific surface area of ​​magnesium stearate (usually, the finer the particle size, the larger the specific surface area, and the smaller the bulk density).

In addition, the attribute that affects the lubricating function of magnesium stearate is the specific surface area. The larger the specific surface area, the better the lubricity. Under certain conditions of the mixture and tablet press, the larger the specific surface area of ​​magnesium stearate, the lower the tensile strength of the tablet, the higher the friability, and the slower the dissolution and disintegration. The specific surface area of ​​magnesium stearate on the market is usually between 5~20m2/g, which is a considerable range. Some of the variation may be due to the way the test samples were prepared and tested. Specific surface area data should be determined at several different relative pressures (ie, multipoint method). Usually suppliers set the specific surface area at twice the lower limit (for example: 6~12m2/g). While changes within this range may not affect all products, it may affect products that are prone to over-lubrication.

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: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food 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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