Fast Penetrant Fast T-50H, chemically named sodium di(2-ethylhexyl) sulfosuccinate (CAS No.: 577-11-7), has a molecular formula of C20H37NaO7S and a molecular weight of 444.56. It appears as a colorless to light yellow transparent liquid, belongs to anionic surfactants, with an effective active content of 48~52%. This product is also known internationally as Aerosol OT or Aerosol OT-50, and is a classic variety with high popularity and long application history among domestic penetrants.
The core performance of this product lies in its extremely low surface tension (≤30 mN/m), with a penetration time of less than 5 seconds measured by the standard canvas settling method, meaning it can quickly penetrate into fibers, porous substrates, and tiny gaps. At the same time, Fast T-50H has good wetting and spreading ability and efficient emulsifying capability for oils and fats, with low foaming, making it suitable for processes where foam control is needed. The product is resistant to acids, alkalis, and hard water, performing best under neutral and mild acid-base conditions, but its stability may decrease in strong acid or strong alkali environments.
Fast T-50H has an HLB value of approximately 10.5, a critical micelle concentration (CMC) of 0.68~1.1 g/L, a density of 1.05~1.10 g/cm³, and a pH value of 5.0~7.0 for a 1% aqueous solution. These parameters give it good compatibility and stability in formulations, allowing it to be compounded with various auxiliaries to meet the process requirements of different industrial scenarios.
| Parameter Item | Specification Indicator |
|---|---|
| Chemical Name | Sodium di(2-ethylhexyl) sulfosuccinate (DOSS) |
| CAS No. | 577-11-7 |
| Appearance | Colorless to light yellow transparent liquid |
| Ionic Type | Anionic surfactant |
| Active Content | 48~52% |
| pH Value (1% Aqueous Solution) | 5.0~7.0 |
| HLB Value | 10.5 |
| Surface Tension | ≤30 mN/m |
| Penetration Power (Standard Canvas Settling Method) | <5 seconds |
| Density | 1.05~1.10 g/cm³ |
| Dynamic Viscosity (25°C) | 50~200 mPa·s |
| Flash Point | >100°C (Closed Cup) |
| Acid Value | ≤2.0 mgKOH/g |
| Saponification Value | ~252 mgKOH/g |
| Refractive Index | 1.350~1.400 |
| Monoester Content | ≤2% |
| Diester Content | ≥45% |
| Foam Characteristics | Low foam |
| Heavy Metals | ≤10 mg/kg |
| Arsenic | ≤2 mg/kg |
| Packaging Specification | 50kg plastic drum / 200kg plastic drum / IBC tote |
Note: The above parameters are all derived from actual measurement data from the Guoli Chemical product database.
Textile Printing and Dyeing: In pretreatment (desizing, scouring, bleaching), dyeing, and printing processes, the recommended dosage is 0.1%~0.5% of the total working solution. Utilizing its fast penetration property, it allows chemicals to diffuse uniformly along the fibers, significantly improving dye uptake and leveling, reducing quality issues such as color spots and color differences.
Pesticide Formulations: When added as a wetting and penetrating synergist in pesticide formulations, the recommended dosage is 1%~5% of the total formulation. It enhances the adhesion, spreading, and penetration of the pesticide liquid on plant leaf surfaces and target organisms, reducing liquid runoff and improving field efficacy.
Leather Processing: In wet processing steps such as soaking and degreasing, the recommended dosage is 0.05%~0.3% of the total working solution. It accelerates the deep penetration of water and chemicals into the leather fiber interior, shortens processing time, and improves the softness and quality uniformity of the leather.
Industrial Cleaning and Household Chemicals: As a penetrating and detergency component in cleaning formulations, the recommended dosage is 0.5%~3% of the total formulation. It quickly penetrates the interface between dirt and substrate, promoting dirt detachment and dispersion, and has a good removal effect on stubborn stains such as oil and carbon deposits.