Sodium Lauryl Sulfate

Product Details

CasNo： 151-21-3

MF： C12H25NaO4S

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information

• Chemical Name: Sodium Lauryl Sulfate (Sodium Dodecyl Sulfate)
• English Name: Sodium Lauryl Sulfate
• CAS Number: 151-21-3
• Molecular Formula: C12​H25​NaO4​S
• Molecular Weight: 288.38
• Common Synonyms: SLS; Sodium dodecyl sulfate; n-Dodecyl sodium sulfate

2. Appearance and Properties

• Pure SLS appears as white or slightly yellow powder or crystalline granules. Industrial-grade products may be pale yellow or milky white due to trace impurities.
• It has no obvious odor and is prone to moisture absorption and caking (especially in environments with humidity > 60%). However, caking does not affect product performance, and it can return to a uniform state after dissolution.

3. Core Physical and Chemical Properties

4. Key Performance Characteristics

1. Strong Detergency: Rapidly breaks the bond between oil stains and substrates, effectively removing oil, dust, protein-based dirt, etc.—making it a core component of detergents.
2. High Foaming Ability: Easily forms fine and stable foam in water, which not only enhances the user experience of cleaning products but also improves the ability to encapsulate dirt.
3. Good Compatibility: Can be compounded with anionic and nonionic surfactants (e.g., AES, cocamide DEA) to synergistically enhance performance. However, compounding with cationic surfactants may cause precipitation.
4. Cost-Effectiveness: Compared with ether-based surfactants (e.g., SLES), its raw materials are easily available and the production process is simple, resulting in lower costs for the same detergency effect.

5. Application Fields

• Daily Chemical Field:
  • Personal Care: Toothpaste (as a foaming agent to enhance cleaning sensation), soap, body wash, and affordable shampoo (needs to be paired with mild ingredients to reduce irritation).
  • Household Cleaning: Core component of laundry detergent, dishwashing liquid, and heavy-duty kitchen oil cleaners (mainly for 去污 and foaming).
• Industrial Field:
  • Textile Industry: Used as a fabric cleaner and desizing agent to remove oil and size from the surface of textile fibers.
  • Metal Processing: Main component of metal degreasers, removing cutting oil and anti-rust oil from workpiece surfaces.
  • Laboratory & Pharmaceutical: Reagent-grade SLES is used in protein electrophoresis (SDS-PAGE) and as a solubilizer in pharmaceutical formulations (e.g., oral liquids, ointments).
• Other Fields: Foaming agent in foam fire extinguishers; pesticide emulsifier (improves the adhesion of liquid pesticides on crop surfaces).

6. Safety Instructions

1. Skin Irritation: Compared with ethoxylated derivatives (e.g., SLES), SLS has higher irritation. Direct contact with high-concentration powder or prolonged use of undiluted products may cause skin dryness and redness; people with sensitive skin should use it with caution.
2. Eye Irritation: Accidental eye contact may cause stinging and tearing—rinse immediately with plenty of water.
3. Environmental Impact: It has good biodegradability (BOD5/CODcr ≈ 0.6), but high-concentration discharge may cause short-term irritation to aquatic organisms and must comply with industrial wastewater discharge standards.
4. Usage Recommendations: The addition amount in daily chemical products is usually controlled at 5%–15%. Combining it with moisturizing ingredients such as glycerin and panthenol can reduce irritation.

7. Packaging and Storage

• Packaging Forms:
  • Small Sizes (100g, 500g, 1kg): Aluminum foil bags or sealed plastic bottles, suitable for laboratories and small-batch trials.
  • Industrial Sizes (25kg, 50kg): Kraft paper bags, cardboard drums, or woven bags lined with polyethylene film—moisture-proof and easy to handle.
  • Bulk Packaging (500kg, 1000kg): Ton bags (with moisture-proof inner liners), suitable for large-scale industrial procurement.
• Storage Conditions:
  • Store in a cool, dry place (temperature 5–30°C, relative humidity < 60%) in sealed containers to prevent moisture absorption and caking.
  • Keep away from strong acids and oxidants to avoid product decomposition.
  • Shelf Life: 24 months in unopened condition; use as soon as possible after opening and take moisture-proof measures.