Stearic Acid, 99.6%

Product Introduction

Stearic Acid is a straight-chain saturated fatty acid composed of an 18-carbon hydrophobic chain and a terminal carboxyl group. Its molecular structure provides both hydrophobic interactions and chemical reactivity, enabling applications in formulation, surface modification, and material science.

Stearic Acid is commonly investigated as:

• Lubricant additive
• Surface modification reagent
• Hydrophobic coating component
• Emulsifying and formulation aid
• Polymer processing additive
• Organic synthesis intermediate

It is typically supplied as a white crystalline solid or waxy material. Stearic Acid has a molecular formula of C₁₈H₃₆O₂, molecular weight of 284.48 g/mol, and melting point around 67–69 °C.

Mechanism / Principle

The functional properties of Stearic Acid mainly originate from its long hydrocarbon chain and carboxylic acid group.

• Surface modification ability
  The carboxyl group can interact with metal oxides and inorganic surfaces, while the long alkyl chain provides hydrophobic properties.
• Lubrication effect
  The long-chain structure reduces friction between surfaces and improves processing performance.
• Emulsification and stabilization
  Stearic Acid can contribute to oil-phase structuring and formulation stability.
• Hydrophobic modification
  It can introduce water-repellent characteristics into polymer and inorganic material systems.
• Chemical derivatization
  The carboxylic acid group enables esterification, salt formation, and other chemical transformations.

Key Research Applications

1. Polymer Materials & Plastics

Stearic Acid is widely investigated as a functional additive in polymer processing and modification.

Applications include:

• Polymer lubricants
• Processing aids for plastics
• PVC stabilization systems
• Polymer surface modification
• Composite material additives

Its ability to reduce processing friction and improve material compatibility makes it relevant to polymer manufacturing research.

2. Dental Materials

Stearic Acid can be investigated in dental-material and oral-care material systems due to its lubrication, hydrophobic modification, and formulation-stabilizing properties.

Potential applications include:

• Dental composite formulation additives
• Dental material surface modification
• Hydrophobic modification of dental polymers
• Oral-care formulation components
• Functional additive research in dental materials

3. Cosmetics & Pharmaceutical Formulations

Stearic Acid is widely studied as a formulation component due to its emulsion-stabilizing and texture-modifying properties.

Applications include:

• Cream and emulsion systems
• Ointment formulations
• Lipid-based delivery systems
• Pharmaceutical excipient research
• Personal-care formulation development

4. Functional Materials & Surface Engineering

Stearic Acid is relevant to functional material research due to its ability to modify inorganic and polymer surfaces.

Applications include:

• Metal oxide surface modification
• Nanoparticle functionalization
• Hydrophobic coatings
• Composite materials
• Interface engineering

Advantages

• Long-chain fatty acid structure suitable for surface and formulation research.
• Excellent compatibility with lipid, polymer, and inorganic material systems.
• Hydrophobic modification capability for coatings and composite materials.
• Good lubrication performance in polymer processing applications.
• Reactive carboxyl group for chemical derivatization.
• Broad application potential across dental, pharmaceutical, polymer, and functional-material research.

Storage & Handling

• Store in a tightly closed container.
• Keep in a cool, dry, and well-ventilated environment.
• Protect from moisture and direct sunlight.
• Avoid contact with strong oxidizing agents.
• Handle using appropriate laboratory protective equipment.

Recommended storage condition: room temperature in a dry environment.

Research Areas

• Dental Materials – Dental composite additives, hydrophobic dental polymers, and oral-care formulation research.
• Polymer Materials – Plastic processing additives, polymer modification, and composite materials.
• Pharmaceutical Formulations – Lipid-based formulations, ointments, and excipient research.
• Cosmetics & Personal Care – Emulsion systems, creams, and texture modifiers.
• Surface Engineering – Metal oxide modification, hydrophobic coatings, and interface research.
• Nanomaterials – Nanoparticle functionalization and dispersion systems.
• Functional Materials – Organic-inorganic composites and advanced material development.
• Organic Synthesis – Fatty acid derivatives and specialty chemical synthesis.

Q1. What is Stearic Acid?
Stearic Acid is an 18-carbon saturated fatty acid widely used as a functional organic compound in formulation and material research.

Q2. What are the main applications of Stearic Acid?
Main applications include polymer additives, surface modification, pharmaceutical formulations, cosmetics, coatings, and functional materials.

Q3. Can Stearic Acid be used in dental-material research?
Yes. Stearic Acid can be investigated as a functional additive for dental polymer systems, surface modification, and formulation studies.

Q4. Is Stearic Acid water soluble?
Stearic Acid is practically insoluble in water but soluble in organic solvents and compatible with lipid-based systems.

Q5. What is the physical form of Stearic Acid?
It is typically supplied as a white crystalline powder, flakes, or waxy solid.

Q6. What is the melting point of Stearic Acid?
The melting point is approximately 67–69 °C.

Q7. How should Stearic Acid be stored?
Store sealed in a cool, dry environment and protect from moisture and strong oxidizing agents.