Sodium sulfide molar mass
Analysis of Sodium lauryl ether sulfate SLES Core Quality Indicators in National Standards
The Sodium lauryl ether sulfate SLES required active matter content is ≥28% (mass fraction). When determined using the ethanol extraction method, the water bath temperature must be precisely controlled within the range of (50±2)°C.
The unsulfated oil content is strictly limited to ≤2.0%. Exceeding this threshold may increase product irritation. During testing, the layering time after carbon tetrachloride extraction must be no less than 30 minutes.