Magnesium Stearate MgSt₂ Octadecanoic acid magnesium salt CAS 557-04-0

Tree Chem manufactures Magnesium Stearate CAS 557-04-0 for global buyers seeking high-quality grades used across plastic, food, and cosmetic formulations. This fine white powder serves as a lubricant, stabilizer, and anti-caking agent, providing excellent mold release, smooth processing, and improved product consistency in industrial and consumer applications.

With years of experience in supply and formulation support, Tree Chem has established long-term partnerships with manufacturers in the plastic, food, and cosmetic industries, delivering stable quality and professional technical assistance to meet diverse production needs. For further information or quotations, please contact rocket@cntreechem.com.

Specification

Basic Information

Technical Specification

Applications

Plastic Industry

• Magnesium stearate is widely used in PVC and other general-purpose plastics as a heat stabilizer. Magnesium stearate absorbs the hydrogen chloride released during thermal decomposition and replaces active chlorine, thereby suppressing degradation and allowing PVC to maintain its color and mechanical properties during extrusion and molding processes.
• Magnesium stearate also functions as a lubricant and release agent in plastic processing. Magnesium stearate forms a uniform lubricating film between the polymer and the metal surface to reduce friction and adhesion, while its viscosity-reducing effect improves melt flow and mold filling, enhancing demolding efficiency and product surface smoothness.
• Magnesium stearate serves as both a lubricant and dispersant in PE and PP systems. Magnesium stearate promotes uniform pigment and filler distribution, reducing flow marks and color differences. At the same time, magnesium stearate improves melt stability in high-filled formulations, ensuring better appearance and dimensional consistency.

Rubber Industry

• Magnesium stearate acts as an activator and processing aid in both natural and synthetic rubbers. Combined with zinc oxide and accelerators, magnesium stearate enhances crosslinking efficiency and shortens vulcanization time, resulting in higher tensile strength, wear resistance, and resilience in the vulcanized rubber.
• During rubber compounding, magnesium stearate provides internal lubrication and dispersion assistance. Magnesium stearate reduces torque and energy consumption while decreasing equipment wear. Furthermore, magnesium stearate improves the uniform dispersion of carbon black and silica, optimizing compound appearance and process stability.
• In molding and extrusion, magnesium stearate serves as a release and anti-stick component. Magnesium stearate minimizes mold adhesion and surface defects, increasing molding success rates and ensuring smoother surfaces for rollers, seals, and other rubber products.

Coating Industry

• Magnesium stearate serves as a drier, rheology modifier, and surface feel enhancer in solvent-based and waterborne coatings. In alkyd, epoxy, and acrylic systems, magnesium stearate promotes oxidative curing and shortens surface and full drying times, while improving film smoothness and polishing properties.
• Magnesium stearate performs as a matting and anti-settling agent. It forms micro-rough surface textures to achieve a soft matte appearance and stabilizes pigment suspension, reducing sedimentation and color floating.
• In powder coatings, magnesium stearate functions as a flow modifier and anti-caking additive. Magnesium stearate enhances powder flowability and charging uniformity during application, improving coating density and visual uniformity after curing.

Cosmetic Industry

• Magnesium stearate improves adhesion and smooth texture in powder cosmetics such as pressed powder, loose powder, and eyeshadow. Magnesium stearate enhances compaction strength and break resistance while providing a dry and silky skin feel. In addition, magnesium stearate’s oil absorption property extends makeup wear and improves oil control.
• In creams and emulsions, magnesium stearate contributes to emulsification, thickening, and structural stabilization. Magnesium stearate increases system viscoelasticity and improves spreadability, while forming a light protective film on the skin to reduce moisture loss.

Pharmaceutical Industry

• Magnesium stearate is one of the most widely used excipients in tablet and capsule manufacturing. Magnesium stearate reduces friction between granules and punches, preventing sticking and capping, ensuring smooth tableting, and improving tablet surface finish.
• In ointment and suppository formulations, magnesium stearate enhances consistency and stability. Magnesium stearate improves spreadability and adhesion while controlling moisture penetration, extending shelf life and improving sensory performance.

Food-Related Applications

• Magnesium stearate acts as an anti-caking and flow aid in powdered foods and nutritional supplements. Magnesium stearate reduces clumping and improves filling and redispersion consistency, while enhancing uniformity in dry mixes for stable taste and texture.
• In lipid-based systems, magnesium stearate serves as a secondary emulsifier and stabilizer. Magnesium stearate minimizes oil-water separation and improves molding and release properties, enhancing appearance and shelf-life stability.

Emerging Applications

• Magnesium stearate has shown early-stage applications in biodegradable plastics, powder coatings, bio-based materials, batteries, and additive manufacturing, where it provides lubrication, dispersion, interface stabilization, and release effects that improve processing and performance.

Storage & Handling

• Store in a cool, dry, and well-ventilated area, away from heat sources, flammable materials, and reducing agents.
• Keep containers tightly sealed and moisture-proof.
• Use corrosion-resistant packaging and storage equipment.
• Maintain good ventilation during handling to prevent dust accumulation.
• Follow local oxidizer storage and transport regulations (UN 1486).

Usage Notice

• Use standard PPE during handling.
• Disperse uniformly for best performance and evaluate compatibility in the final formulation.
• PVC Stabilizer System: Magnesium stearate 0.6%, Calcium stearate 0.8%, Epoxidized soybean oil 3%. Magnesium stearate absorbs hydrogen chloride and replaces active chlorine, improving PVC thermal stability and processability.
• Rubber Vulcanization Formula: Magnesium stearate 1.0%, Zinc oxide 5%, Sulfur 2.5%, Accelerator 1%. Magnesium stearate acts as an activator to promote vulcanization, enhancing rubber crosslink density and elasticity.
• Powder Coating System: Magnesium stearate 0.3%, Epoxy resin 60%, Pigment 10%, Curing agent 2%. Magnesium stearate improves powder flowability and prevents caking, enhancing coating uniformity.
• Pressed Powder Formula: Magnesium stearate 5%, Talc 70%, Mica 15%, Pigment 10%. Magnesium stearate increases powder adhesion and provides a fine, silky texture.
• Tablet Formula: Magnesium stearate 1.5%, Microcrystalline cellulose 60%, Lactose 30%, Active ingredient 8.5%. Magnesium stearate serves as a lubricant to reduce friction and prevent tablet sticking.
• Food Powder Formula: Magnesium stearate 0.4%, Maltodextrin 20%, Vitamin premix 79.6%. Magnesium stearate prevents caking and improves powder flow and uniformity.

Packaging

• 15 kg/bag
• 400 kg/jumbo bag
• Customized packaging available upon request.