Stearic Acid (Soft Moisturizing Emollient Acid)-CAS 57-11-4
Product Name: Stearic Acid (Soft Moisturizing Emollient Acid)
INCI Name: Stearic Acid
Alias: Octadecanoic Acid, C18 Saturated Fatty Acid, Cosmetic Softening Acid, Cream Shaping Stabilizer, Formula Opacifying Agent, Skin Smoothing Emollient
CAS No.: 57-11-4
Appearance: White flaky or waxy solid, pure and uniform texture, odorless, free of impurities, yellow spots and agglomeration.
Grade: Cosmetic Premium Grade
MOQ (Minimum Order Quantity): 25KG
Solubility: Insoluble in water, easily soluble in hot ethanol, ether, fatty oils and ester-based cosmetic oil-phase systems.
Storage Condition: Sealed and stored in dry, cool and ventilated warehouse, storage temperature 5–30℃, avoid high temperature melting, direct sunlight, damp environment and heavy pressure stacking. Keep tightly sealed after opening to prevent moisture absorption and agglomeration, ensuring stable thickening and shaping performance.
Shelf Life: 24 Months
Stearic Acid, Octadecanoic Acid, Soft Emollient Acid, Cosmetic Thickener, Emulsifier Stabilizer, Skin Smoothing Agent, Cream Texture Modifier, Formula Opacifier, Low-Irritation Cosmetic Acid
Stearic Acid (Soft Moisturizing Emollient Acid)-CAS 57-11-4
Stearic Acid is a high-purity vegetable-based C18 long-chain saturated fatty acid, a necessary texture-setting and stabilizing raw material for cosmetic emulsion systems. Different from irritating small-molecule acids and unstable short-chain fatty acids, it has mild skin-friendly properties and excellent formula adjustability.
It can cooperate with alkaline neutralizers to form a fine soap-based network structure, effectively improving the rheological properties of creams and lotions, solving the problems of poor moldability, easy water precipitation and oil floating of traditional emulsions.
While realizing thickening and stabilization, it can soften skin keratin, smooth rough skin texture, and endow finished products with delicate and soft emollient effect. In addition, its natural opacifying property can turn transparent formula into uniform milky white, greatly improving product appearance grade. It is perfectly compatible with cetyl alcohol and stearyl alcohol, and is the core matching raw material for high-stability and high-grade texture cosmetic systems.
Key Benefits
• Mild C18 Long-Chain Structure, Safe and Low-Irritation: Adopts natural vegetable refined long-chain fatty acid structure, no strong acidity irritation, will not damage skin sebum barrier. It is mild and non-irritating after formula compounding, suitable for daily skin care and gentle cleansing formulas, and safe for long-term skin contact.
• Powerful Thickening & Texture Shaping: It is the core shaping agent for cream formulas. After neutralization and saponification, it forms a dense three-dimensional emulsion network, effectively improving loose and thin cream texture, enhancing product solidity and ductility, making the cream delicate and smooth with perfect molding effect.
• Super Emulsion Stabilization, Anti-Layering & Anti-Oil-Floating: Effectively improve the high and low temperature cycle stability of emulsion products, lock oil-water balance, prevent oil phase floating, water precipitation and system stratification, greatly extend product shelf stability and solve long-term storage deterioration problems.
• Natural Opacification, Upgrade High-Grade Appearance: It has unique natural milky white opacifying property, which can uniformly turn transparent lotion into soft milky white state without additional opacifier, making the product color uniform and texture advanced.
• Soft Keratin & Smooth Skin Texture: It can moderately soften thick and rough skin keratin, smooth dry and uneven skin texture, improve dull and rough skin condition, and bring long-lasting soft and moist skin feel after application.
• Perfect Compatibility with Fatty Alcohol System: Highly compatible with cetyl alcohol and stearyl alcohol. The compound system has more stable structure, better texture and stronger water-locking and moisturizing performance, which is the classic high matching formula combination for high-end cream products.
Applications
• Nourishing Cream & Lotion Series: Core thickening and shaping raw material for facial moisturizing cream, nourishing face cream, anti-dry body lotion and winter skin care cream. It stabilizes cream texture, improves product ductility, and creates long-lasting moisturizing and softening effect.
• Mild Soap-Based Cleansing Products: Key raw material for mild cleansing milk, facial cleanser and body cleansing lotion. It forms fine and dense foam, achieves deep cleaning without tightness, and is suitable for daily gentle cleansing formulas.
• High-Stability Opaque Skincare System: Special opacifying and stabilizing raw material for milky white skincare lotion and emulsion products. It unifies product appearance, optimizes internal emulsion structure, and improves overall product grade and stability.
• Hair Care Styling Cream Products: Used in hair care cream, hair moisturizing paste and hair styling cream. It stabilizes hair care emulsion system, improves product texture, and makes hair smooth and supple after use without greasy residue.
• Basic Makeup Cream Base: Applied in foundation cream, isolation cream and concealer cream. It optimizes cream spreadability, stabilizes formula structure, and ensures uniform and docile makeup application with long-lasting fitting effect.
• Daily Body Care Products: Widely added in hand cream, body butter, anti-chapped cream and other daily care products to thicken and shape, stabilize the system, and improve the soft and moisturizing effect of body skin.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | Stearic Acid | Compliant |
Appearance | White Flaky Solid, Odorless, Pure Texture | Compliant |
Purity (%) | ≥98.0 | 98.9 |
Melting Point (℃) | 54.0–57.0 | 55.8 |
Acid Value (mgKOH/g) | 205–210 | 207.6 |
Saponification Value (mgKOH/g) | 206–211 | 208.2 |
Moisture Content (%) | ≤0.2 | 0.07 |
Iodine Value (g/100g) | ≤1.0 | 0.35 |
Color (Gardner) | ≤1# | 0.5# |
Emulsion Stability | No Stratification, No Oil Floating, Stable Texture | Qualified |
Heavy Metal (Pb) | ≤1ppm | 0.1ppm |
Arsenic (As) | ≤0.5ppm | Not Detected |
Mercury (Hg) | ≤0.1ppm | Not Detected |
Cadmium (Cd) | ≤0.1ppm | Not Detected |
Total Bacteria | ≤100CFU/g | Qualified |
Pathogenic Bacteria | Negative | Negative |
Conclusion | Conforms to cosmetic grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of Stearic Acid?
A1: The standard MOQ is 25KG, support sample orders for formula testing and trial production, and support customized high-purity specifications for mass production.
• Q2: What is the difference between Stearic Acid and fatty alcohols (Cetyl/Stearyl/IsoStearyl Alcohol)?
A2: Fatty alcohols focus on moisturizing, emollient and skin feel optimization; Stearic Acid focuses on formula thickening, shaping, emulsification stabilization and natural opacification. It needs to be neutralized with alkali to exert the best thickening effect. It is the best matching raw material for fatty alcohol systems, and the compound use can greatly improve formula stability and texture grade.
• Q3: What is the recommended dosage in cosmetic formulas?
A3: Nourishing cream & lotion: 2.0%–5.5%; Mild soap-based cleanser: 3.0%–8.0%; Opaque skincare emulsion: 1.5%–4.5%; Hair care cream products: 1.0%–3.5%; Makeup cream base: 2.0%–4.0%, adjustable according to product texture and opacification requirements.
• Q4: Is Stearic Acid mild and suitable for sensitive skin formulas?
A4: Yes. After scientific neutralization in the formula, it has no acidic irritation, mild and skin-friendly, non-allergenic and non-irritating. It can soften skin and stabilize the system, which is safe and reliable for sensitive skin and daily mild skincare formulas.
• Q5: What core functions can Stearic Acid provide in formulas?
A5: It has four core functions: thickening and shaping to solidify cream texture, assisting emulsification to stabilize oil-water system, natural opacification to upgrade product appearance, and softening keratin to optimize skin feel. It is an indispensable multifunctional raw material for emulsion cosmetic formulas.
• Q6: What are the formula usage notes?
A6: It is recommended to add in the oil phase, heat to 65–85℃ for full melting; match with alkaline neutralizer (KOH/NaOH) for saponification reaction to achieve optimal thickening and stabilization effect; compound with cetyl/stearyl alcohol to balance texture and moisturizing performance; avoid excessive neutralization to prevent formula hardening.
• Q7: Can it provide stable supply and professional technical support?
A7: Strictly control core indicators such as purity, acid value, iodine value and moisture content to ensure consistent batch stability. Support long-term bulk order supply and provide one-stop professional services including formula debugging, neutralization ratio optimization and after-sales technical guidance.
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