SLS Needles (Sodium Lauryl Sulfate Needles)
ELSURFACTM – SLSn
Sodium Lauryl Sulfate Needles is a high-purity anionic surfactant in crystalline needle form, renowned for its exceptional foaming, cleansing, and emulsifying properties, widely utilized in personal care, household, and industrial applications due to its cost-effectiveness, detergency power, and versatility across numerous formulation types.
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CAS Number
151-21-3
HS Code
34.02.11.10
Molecular Formula
C₁₂H₂₅NaO₄S
INCI Name
Sodium Lauryl Sulfate (SLS)
SLS Needles (Sodium Lauryl Sulfate Needles)
ELSURFACTM – SLSn
Sodium Lauryl Sulfate Needles is a high-purity anionic surfactant in crystalline needle form, renowned for its exceptional foaming, cleansing, and emulsifying properties, widely utilized in personal care, household, and industrial applications due to its cost-effectiveness,…
CAS Number
151-21-3
INCI Name
Sodium Lauryl Sulfate (SLS)
HS Code
34.02.11.10
Molecular Formula
C₁₂H₂₅NaO₄S
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Product Specification
Physical Properties
| Property | Specification |
|---|---|
| Odor | Faint odor of fatty substances |
| Appearance | White powder |
| Molecular Weight (G/Mol) | 288.38 |
| Ph (If Aqueous Solution) | 9.1 at 10 g/l |
| Density Or Specific Gravity | greater than 1.1 at 68 °F |
Chemical Properties
| Property | Specification |
|---|---|
| Pka | 1.84 ± 0.10 (predicted) |
| Water Solubility | 15g/100ml at 20 °C |
| Incompatibilities | Strong oxidizing agents |
| Hazardous Reactions | When heated to decomposition it emits toxic fumes of /sulfur oxides and sodium oxides |
Thermal Properties
| Property | Specification |
|---|---|
| Melting Point | 399 to 405 °F |
| Thermal Stability | Stable at ambient temperature; decomposes on strong heating |
| Decomposition Temperature | Decomposition Temperature |
Processing Methods & Reference Formulations
A. Shampoo
Pre-dilute Sodium Lauryl Sulfate with deionized water before adding to the shampoo batch to prevent gel formation and viscosity issues. Add it slowly under moderate stirring, ideally after amphoteric surfactants like cocamidopropyl betaine.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| Sodium Lauryl Sulfate (28% active) | 40% |
| Cocamidopropyl Betaine | 10% |
| Glycerin | 3% |
| Sodium Chloride | 1% |
| Preservative (e.g., DMDM Hydantoin) | 0.3% |
| Fragrance | 0.2% |
| Purified Water | 40-50% |
B. Body Wash
Pre-dilute Sodium Lauryl Sulfate with deionized water before adding to the body wash to avoid viscosity spikes and clumping. Add it slowly under gentle stirring, ideally after milder surfactants to improve skin compatibility.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| Primary surfactants (SLS) | 10-20% |
| Secondary surfactants (CAPB, CAO, CDEA etc.) | 2-8% |
| Thickening agents | 0.1-3% |
| Fragrances and Essential oils | 0.1-1% |
C. Liquid Soap
In liquid soap formulation, add Sodium Lauryl Sulfate (SLS) slowly to the water phase under gentle stirring to prevent excessive foaming and ensure complete dissolution.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| Sodium Laureth Sulfate (SLES 70%) | 5% |
| Sodium Lauryl Sulfate (SLS 92%) | 1.5% |
| Cocamidopropyl Betaine | 5% |
| Cocamide DEA (CDEA) | 1% |
| Glycerin | 1% |
| EDTA-2Na | 0.1% |
| Salt | 2% |
| Deionized Water | 80-90% |
D. Skin cleansers
In skin cleanser formulation, add Sodium Lauryl Sulfate (SLS) to the water phase slowly with constant gentle stirring to prevent lumping and excessive foaming.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| Water (Aqua) | 60% |
| Glycerin | 5% |
| Sodium Lauryl Sulfate (SLS) | 10% |
| Cocamidopropyl Betaine | 5% |
| Citric Acid | 0.5% |
| Sodium Chloride | 0.5% |
| Phenoxyethanol | 0.8% |
| Ethylhexylglycerin | 0.2% |
| Fragrance | 0.5% |
Dosing Guidelines
A. Dosing by Application
| Products | Authorized dosage |
|---|---|
| Shampoos | 3-30% |
| Body washes | 3-30% |
| Toothpaste | 1-3% |
| Facial cleansers | 5-20% |
About SLS Needles (Sodium Lauryl Sulfate Needles)
Sulfation of lauryl alcohol (dodecanol), followed by neutralization with sodium hydroxide. The yield recovery is typically around 90–95%.
Sulfation of lauryl alcohol (dodecanol), followed by neutralization with sodium hydroxide. The yield recovery is typically around 90–95%. Raw Material: Lauryl Alcohol (C₁₂H₂₆O), Chlorosulfonic Acid (ClSO₃H) or Sulfur Trioxide (SO₃), Sodium Hydroxide (NaOH), Water Overall Formula: C₁₂H₂₆O + SO₃ → C₁₂H₂₅OSO₃H → + NaOH → C₁₂H₂₅OSO₃Na (SLS) + H₂O
About SLS Needles (Sodium Lauryl Sulfate Needles)
Sulfation of lauryl alcohol (dodecanol), followed by neutralization with sodium hydroxide. The yield recovery is typically around 90–95%.
Sulfation of lauryl alcohol (dodecanol), followed by neutralization with sodium hydroxide. The yield recovery is typically around 90–95%. Raw Material: Lauryl Alcohol (C₁₂H₂₆O), Chlorosulfonic Acid (ClSO₃H) or Sulfur Trioxide (SO₃), Sodium Hydroxide (NaOH), Water Overall Formula: C₁₂H₂₆O + SO₃ → C₁₂H₂₅OSO₃H → + NaOH → C₁₂H₂₅OSO₃Na (SLS) + H₂O
Regulatory Compliance
| Region | Max Allowed Level | Notes | Certification Body |
|---|---|---|---|
| China | - | No specific statutory maximum | - |
| India | - | No specific BIS limit for SLS | - |
| Japan | - | No explicit max for finished products. | - |
| Korea, Republic of | - | No specific statutory maximum | - |
| United States | 1% | FDA allows SLS up to 30% in rinse-off products; for leave-on, should not exceed 1% due to irritation risk | FDA |
| ASEAN | - | No specific statutory maximum | - |
| European Union | 1% | EU Cosmetics Regulation caps SLS at 1% in leave-on products; rinse-off products can contain higher levels | SCCS (Scientific Committee on Consumer Safety) |
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