Amphoteric Surfactants

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Amphoteric surfactants are unique surface-active agents that can act as either anionic or cationic surfactants depending on the pH of the solution. These molecules contain both acidic (carboxyl or sulfonic) and basic (amine or quaternary ammonium) functional groups, giving them high versatility, mildness, and compatibility with other surfactants. Amphoteric surfactants are widely used in personal care, household cleaning, industrial applications, pharmaceuticals, and specialty formulations where low irritation and effective cleansing are critical. Common examples include Cocamidopropyl Betaine and Lauryl Betaine.

Description

Primary Uses 

Personal Care & Cosmetics

  • Shampoos & Conditioners: Provide mild cleansing, excellent foam, and compatibility with skin and hair.

  • Facial Cleansers & Body Washes: Offer gentle cleansing without stripping natural oils.

  • Baby Products: Preferred in baby shampoos and body washes due to low irritation potential.

  • Shaving Creams & Lotions: Aid in foam stabilization and improve skin feel.

Household Cleaning Products

  • Dishwashing Liquids: Enhance foaming and grease-cutting while being gentle on hands.

  • All-Purpose Cleaners: Used for their ability to remove dirt while being non-corrosive and mild.

  • Laundry Detergents: Improve wetting and soil removal, especially in sensitive skin formulas.

Industrial & Institutional Cleaning

  • Hard Surface Cleaners: Effective in low to moderate pH environments, compatible with disinfectants.

  • Car Wash Soaps: Provide thick foam and reduce surface tension without damaging paint or wax coatings.

  • Metal Cleaners: Aid in removing oil and particulates without causing corrosion.

Textile & Leather Processing

  • Used as wetting agents, dye leveling agents, and softeners in textile finishing.

  • Employed in leather degreasing and treatment processes.

Pharmaceutical Formulations

  • Used in topical creams, emulsions, and transdermal delivery systems for stability and emulsification.

  • Present in ophthalmic solutions and skin cleansers.

Secondary Uses 

Oil & Gas Industry

  • Utilized as emulsifiers and foam stabilizers in enhanced oil recovery and drilling fluids.

  • Help reduce interfacial tension in oil-water systems.

Agricultural Chemicals

  • Added to pesticide and herbicide formulations to improve spreadability, wetting, and leaf coverage.

  • Help reduce phytotoxicity in foliar sprays.

Electroplating & Metal Finishing

  • Aid in degreasing and preparing metal surfaces without harsh corrosion.

Paints & Coatings

  • Used as dispersing agents to maintain pigment stability and improve flow properties.

  • Help reduce surface tension in waterborne coatings.

Firefighting Foams

  • Improve the foam formation and spreadability in Class A and B firefighting foams.

Printing Inks

  • Used to control ink flow and reduce surface defects.
PRODUCT KEY FEATURES

1. Basic Identification Attributes

  • Chemical Family: Surfactants containing both anionic and cationic groups

  • Common Types: Cocamidopropyl Betaine, Lauryl Betaine, Amphoacetates, Amphopropionates

  • CAS Number: Varies by specific compound (e.g., Cocamidopropyl Betaine: 61789-40-0)

  • HS Code: Typically 3402.90.10 (surface-active agents)

  • Synonyms: Zwitterionic surfactants, dual-charge surfactants

2. Physical & Chemical Properties

  • Physical State: Clear to pale yellow viscous liquid (depends on specific surfactant)

  • Odor: Mild or characteristic fatty odor

  • pH: Amphoteric behavior – cationic in acidic, anionic in alkaline conditions

  • Solubility: Fully soluble in water

  • Surface Tension: Typically reduces surface tension to 25–35 mN/m

  • Foam Properties: High foaming; stable and fine-textured foam

  • Biodegradability: Generally readily biodegradable

  • Stability: Stable in wide pH range (3–10), compatible with electrolytes and other surfactants

3. Safety & Hazard Attributes

  • GHS Classification: Generally not hazardous; varies by specific chemical

  • NFPA Ratings (typical): Health 1, Flammability 1, Reactivity 0

  • Toxicity: Low dermal and oral toxicity

  • Sensitization: Very low irritation to eyes and skin, non-sensitizing in most cases

  • Incompatibilities: Strong oxidizers and highly acidic or alkaline materials can degrade some amphoterics

4. Storage & Handling Attributes

  • Storage Conditions: Store in cool, dry, and well-ventilated area away from sunlight

  • Shelf Life: 12–24 months depending on specific compound and storage conditions

  • Packaging: HDPE drums, IBCs, or sealed containers

  • Handling Precautions: Use gloves and goggles when handling concentrated materials

5. Regulatory & Compliance Attributes

  • FDA (USA): Some amphoterics are approved for indirect food contact

  • EU (REACH): Registered substances depending on compound

  • Cosmetic Regulations: Approved for use in cosmetics (e.g., INCI-listed in EU and US)

  • Environmental Regulations: Must comply with discharge and biodegradability standards

6. Environmental & Health Impact

  • Ecotoxicity: Low aquatic toxicity; however, always assess specific compound data

  • Biodegradability: Readily biodegradable under aerobic conditions

  • Bioaccumulation: Low potential for bioaccumulation

  • Carcinogenicity/Mutagenicity: Not classified as carcinogenic or mutagenic

Human Exposure: Safe for routine use in cosmetics and cleaning products

SAFETY HANDLING PRECAUTIONS
  • Safety Handling Precautions

  • PPE: Wear chemical-resistant gloves, safety glasses, and protective clothing.

  • Ventilation: Use in well-ventilated area to avoid aerosol formation.

  • Hygiene Measures: Wash hands thoroughly after handling. Do not ingest or contact eyes.

  • Storage: Keep in original containers, sealed, and away from moisture and direct sunlight.

 

First Aid Measures

  • Inhalation: Remove to fresh air. Seek medical attention if symptoms persist.

  • Skin Contact: Wash with soap and water. Seek medical advice if irritation occurs.

  • Eye Contact: Rinse cautiously with water for several minutes. Remove contact lenses if applicable.

  • Ingestion: Rinse mouth with water. Do NOT induce vomiting unless instructed by a physician.

 

Firefighting Measures

  • Fire Hazard: Non-flammable. May emit fumes under thermal decomposition.

  • Suitable Extinguishing Media: Water spray, foam, dry chemical, or CO₂.

  • Protective Equipment: Firefighters should wear self-contained breathing apparatus (SCBA) for large fires.

Decomposition Products: May release nitrogen oxides, carbon monoxide, carbon dioxide.