Formulating advanced surfactant systems requires absolute precision. R&D chemists, formulators, and procurement managers know this reality well. Selecting the right chemical grade serves as a critical first step. CAS 68439-49-6, commonly known as Ceteareth or ethoxylated C16-18 alcohols, provides a highly adaptable non-ionic surfactant solution. You face a distinct challenge during procurement. You must match the exact ethoxylation grade to specific formulation requirements. Doing so ensures optimal performance, supply chain reliability, and strict regulatory compliance. A minor miscalculation in grade selection can destabilize your entire emulsion matrix.

This guide breaks down essential technical specifications and primary industry applications. We will explore safety data profiles and crucial supplier evaluation criteria. You will gain actionable insights to streamline your procurement decision. This knowledge empowers you to secure the ideal chemical grade for your next product launch.

Key Takeaways

• Chemical Identity: CAS 68439-49-6 represents a spectrum of ethoxylated fatty alcohols (C16-18) utilized primarily as non-ionic surfactants and emulsifiers.
• Grade Variability: Performance (including HLB values and solubility) is strictly dictated by the degree of ethoxylation (e.g., Ceteareth-20 vs. Ceteareth-50).
• Primary Applications: Dominated by personal care/cosmetics (emulsification) and industrial applications (detergency and wetting agents).
• Compliance & Safety: Subject to distinct regional regulatory frameworks (e.g., ECHA/REACH) requiring verified SDS and hazard classification reviews prior to procurement.
• Sourcing Criteria: Supplier shortlisting must rely on batch-to-batch consistency verified via Certificates of Analysis (COAs), validated purity specifications, and scalable packaging options.

Technical Identity and Formulation Profile of CAS 68439-49-6

Nomenclature and Synonyms

Industry databases categorize this compound under several interchangeable names. You will frequently see it listed as Alcohols, C16-18, ethoxylated. Cosmetic formulators commonly refer to it as Ceteareth. Other technical documents might label it PEG ceto-stearyl ether. Accurate cross-referencing prevents costly procurement errors. You must ensure supplier databases map these synonyms directly back to CAS 68439-49-6. This practice guarantees you receive the precise chemical structure required for your formulations.

Chemical Structure and Mechanics

The functionality of this compound relies on a dual-nature structure. It contains a lipophilic fatty alcohol tail. We identify this as the cetyl and stearyl carbon chain. It also features a hydrophilic polyethylene glycol (PEG) chain. This amphiphilic design forms the core mechanics. It drives the baseline function as a non-ionic surfactant. The lipophilic tail anchors into oil phases. The hydrophilic chain extends into aqueous phases. This mechanism reduces interfacial tension between immiscible liquids. It stabilizes emulsions effectively.

Physical Properties Overview

Physical states vary significantly across different grades. Ambient temperature and molecular weight dictate these properties. The exact degree of ethoxylation plays the largest role. Low-ethoxylation grades often present as cloudy liquids or soft pastes at room temperature. High-ethoxylation grades form solid, waxy flakes or pellets. You must consider these physical states during facility planning. Solid flakes require heated mixing vessels for proper incorporation. Liquid pastes might require heated transfer lines in cold climates.

Core Industry Applications and Success Criteria

Personal Care and Cosmetics

Cosmetic chemists rely heavily on this compound. It acts as a highly stable O/W (oil-in-water) emulsifier. It also functions as a dependable thickener and solubilizer for essential oils.

• Success Criteria: Procured batches must exhibit an odorless profile. Color stability remains paramount to prevent formulation yellowing. The compound must maintain compatibility across distinct active ingredients. It must achieve this without compromising the final skin feel.

Industrial Surfactants and Detergents

Heavy-duty industrial applications demand robust chemical performers. This compound serves as a premium wetting agent and dispersant. It acts as the primary cleaning surfactant in tough formulations.

• Success Criteria: Formulators demand high chemical stability across wide pH ranges. Low foaming traits become critical depending on the specific grade chosen. Hard-water tolerance dictates field performance. The surfactant must prevent mineral precipitation during industrial cleaning cycles.

Textile and Agrochemical Formulations

Agricultural and textile sectors utilize this chemical for specialized surface treatments. It functions primarily as a lubricant in textile spinning. It emulsifies active pesticide ingredients in agrochemicals.

• Success Criteria: Manufacturers closely monitor biodegradability metrics. Uniform dispersion capabilities define application success. The chemical must ensure active ingredients coat crops or fabrics evenly. Environmental runoff concerns require strict adherence to degradation standards.

Evaluating Specifications: Ethoxylation Grades and HLB Values

The Role of EO (Ethylene Oxide) Moles

Formulators must evaluate EO moles carefully. This metric changes aqueous behavior entirely. The number appended to the chemical name indicates these units. Ceteareth-20 contains 20 moles of ethylene oxide. Ceteareth-50 contains 50 moles. Higher EO moles increase the size of the hydrophilic chain. This structural change dictates formulation behavior. It determines how the molecule interacts within solvent matrices.

HLB (Hydrophilic-Lipophilic Balance) Framework

The HLB system provides a numerical representation of surfactant behavior. You must map your formulation needs to this scale.

• Low EO (e.g., Ceteareth-2 to 5): These grades yield lower HLB values (typically 4 to 8). They function primarily as W/O (water-in-oil) emulsifiers. They remain generally insoluble in water.
• Medium/High EO (e.g., Ceteareth-20 to 50): These grades deliver higher HLB values (typically 15 to 18). They serve as strong O/W emulsifiers. They exhibit high water solubility.

Table 1: HLB Value Guidelines and Application Focus

Selection Logic for R&D

R&D teams require a strict decision framework. You must match target phase inversion temperatures (PIT) to the correct grade. Desired emulsion stability relies on this alignment. High PIT requirements demand higher HLB variants. You should calculate the required HLB of your oil phase first. Then, select a CAS 68439-49-6 grade matching that exact numerical requirement. Blending two different grades often achieves the most stable emulsion profile.

Regulatory Compliance and ECHA Safety Profiles

Regulatory Status and REACH

Global supply chains require rigorous compliance checks. You must verify REACH registration status for European markets. ECHA documentation provides this authoritative data. Suppliers must provide explicit proof of tonnage band registrations. Failure to verify this status risks severe import delays. Non-compliant batches face immediate rejection at customs borders. Procurement teams must archive these dossiers internally.

Hazard Classifications (CLP)

Safety data analysis prevents workplace incidents. You must review common hazard statements objectively. Concentrated forms occasionally carry warnings for potential aquatic toxicity. Some high-concentration pastes risk causing severe eye irritation. You must mandate proper PPE during manufacturing. Workers handling pure chemical drums need splash goggles and protective gloves. Diluted formulations typically negate these primary hazard profiles.

Cosmetic Ingredient Review (CIR) and Skin Safety

Topical applications demand elevated safety protocols. The CIR expert panel summarizes standard safe-use limits. They generally deem these ethoxylated alcohols safe for cosmetic use. However, you face one critical mandate. You must check for trace impurities. Cosmetic-grade sourcing requires testing for 1,4-Dioxane. Residual Ethylene Oxide presents another major concern. Trusted suppliers utilize vacuum stripping to remove these harmful byproducts.

Supplier Vetting: Shortlisting and Sourcing CAS 68439-49-6

Quality Assurance and Documentation

Procurement teams must standardize their vetting procedures. You must mandate specific documentation during shortlisting. Require up-to-date Material Safety Data Sheets (MSDS). Request detailed Certificates of Analysis (COA) for recent batches. Always review Technical Data Sheets (TDS) before approving a supplier. Incomplete documentation signals poor internal quality controls. Eliminate non-transparent vendors immediately.

Assessing Batch-to-Batch Consistency

Chemical variance destroys formulation stability. Focus heavily on evaluating supplier tolerances. You must track four critical parameters across multiple shipments:

• Hydroxyl Value: Verifies the precise molecular weight and ethoxylation degree.
• Moisture Content: Measured via Karl Fischer titration. High moisture reduces shelf life.
• Acid Value: Detects unwanted oxidation or degradation.
• Color (APHA/Hazen): Ensures visual clarity. High APHA scores indicate poor synthesis control.

Packaging and Lead Times

Supply chain logistics require strategic packaging selection. Compare packaging formats based on the specific grade’s physical state.

1. Select 200kg steel or plastic drums for liquid grades.
2. Utilize IBC totes for large-scale liquid paste operations.
3. Demand 25kg multi-wall paper bags for solid waxy flakes.

Address supply chain risks proactively. You must verify actual manufacturer capacity versus distributor stock. Direct manufacturer relationships often yield shorter lead times. Distributor networks provide buffer stock but introduce trace contamination risks during repackaging.

Conclusion

Successful deployment of CAS 68439-49-6 requires deliberate strategic planning. It hinges entirely on aligning the specific ethoxylation grade with your intended application. You must calculate your oil phase requirements and match the exact HLB value. Ignoring these metrics guarantees formulation failure.

Procurement and formulation teams must take immediate action. Proceed by requesting technical samples from vetted suppliers. Match incoming COA parameters strictly against internal R&D requirements. Audit all supplier regulatory compliance documents, particularly ECHA and CIR records. This rigorous approach guarantees consistent product quality. It protects your brand reputation and ensures seamless manufacturing operations.

FAQ

Q: What is the difference between CAS 68439-49-6 and other ethoxylated alcohols?

A: This specific registry number denotes a C16-18 carbon chain length. We derive it from a specific blend of cetyl and stearyl alcohols. Other ethoxylated alcohols might use shorter (lauryl) or longer (behenyl) carbon chains. The C16-18 backbone provides unique structural stability. It creates superior viscosity-building properties in emulsions compared to shorter chain variants.

Q: Is CAS 68439-49-6 considered safe for cosmetic formulations?

A: Yes. Industry panels consider it highly safe for cosmetics when formulated properly. The Cosmetic Ingredient Review (CIR) supports its use in topical applications. You must monitor trace impurities. Cosmetic-grade sourcing requires strict testing for 1,4-Dioxane and residual Ethylene Oxide. High-quality suppliers actively remove these manufacturing byproducts to meet strict regulatory safety limits.

Q: How does the Ceteareth number (e.g., -20, -50) affect solubility?

A: The number indicates the exact moles of Ethylene Oxide (EO) attached to the fatty alcohol. A higher number means a longer hydrophilic chain. Ceteareth-20 and Ceteareth-50 possess high HLB values. They dissolve easily in water. Conversely, lower numbers like Ceteareth-5 remain oil-soluble and water-insoluble. You must match this number to your desired solvent phase.

Q: What is the standard shelf life and storage requirement for this compound?

A: Most manufacturers guarantee a shelf life of 12 to 24 months. You must store the compound in a cool, dry place. Keep all containers tightly sealed. Avoid extreme temperature fluctuations. High heat can cause irreversible phase separation in pastes or melt solid flakes. Proper storage prevents degradation and maintains chemical consistency over time.