Food-grade magnesium stearate, as an important food additive, plays an indispensable role in the food industry due to its unique physicochemical properties and wide range of applications. This article provides a detailed introduction to magnesium stearate from its basic properties, production methods, application fields, and safety standards.

　　I. Basic Properties

　　Food-grade magnesium stearate is a white, non-gritty fine powder with a slight odor and a slippery feel when in contact with skin. It is insoluble in water, ethanol, and ether, but soluble in hot water and hot ethanol. It decomposes into stearic acid and the corresponding magnesium salt when exposed to acids. This substance has a density of approximately 1.07 g/cm³, a high melting point, and some hygroscopicity.

　　II. Production Methods

　　The production of food-grade magnesium stearate mainly involves a saponification reaction between stearic acid and an alkaline solution in hot water to produce sodium stearate, which then undergoes a metathesis reaction with magnesium sulfate to produce magnesium stearate. After dehydration and air drying, the finished product is obtained. This production process requires strict control of reaction conditions and product quality to ensure product safety and stability.

　　III. Application Fields

　　Food Additives: Magnesium stearate, as an emulsifier, anti-caking agent, and coating agent, is widely used in the production and processing of foods such as candies, candied fruits, pastries, chewing gum, and some dairy products. It can effectively improve the taste and texture of food and extend its shelf life.

　　Pharmaceutical Manufacturing: In the pharmaceutical field, magnesium stearate is used as a lubricant, release agent, glidant, and anti-adhesive agent for tablets. It can improve the compressibility and flowability of tablets, ensuring the stability and consistency of tablets during manufacturing and storage.

　　Cosmetics Industry: Magnesium stearate is used in cosmetics as an emulsifier, thickener, and stabilizer. It can increase the adhesion and lubricity of cosmetics, improving the user experience and effect.

　　Other Industrial Applications: In addition, magnesium stearate is also used as a stabilizer and lubricant for polyvinyl chloride, a drier for paints, and a finishing agent for textiles, etc.

　　IV. Safety Standards

　　The production and use of food-grade magnesium stearate must strictly comply with relevant national food safety standards and regulations. In China, the executive standard for food additive magnesium stearate is GB1886.91—2016. This standard specifies the sensory requirements, physicochemical indicators, and testing methods for magnesium stearate. At the same time, production enterprises also need to establish a sound quality management system and traceability system to ensure product safety and traceability.

　　In summary, food-grade magnesium stearate plays an important role in the food industry due to its unique properties and wide range of applications. However, its production and use must also strictly comply with relevant national safety standards and regulations to ensure product safety and stability.