1. Soap Thickener Crystallization & Fiber Network Morphology
In grease manufacturing, 12-HSA (currently under development at Nagdev) is reacted with Lithium Hydroxide Monohydrate (LiOH·H₂O) in petroleum or synthetic base oils at temperatures between 95°C and 205°C. The terminal carboxylic acid group neutralizes rapidly to form Lithium 12-Hydroxystearate.
During controlled cooling and homogenization, the hydroxyl group (-OH) on the 12th carbon engages in extensive intermolecular hydrogen bonding. This unique stereochemistry drives the self-assembly of dense, interlocking micro-fibers (typically 0.1 to 0.5 µm wide and 5 to 20 µm long). This micro-fibrillar matrix physically traps base oil via capillary forces, creating an elastic colloidal gel.
2. Performance Comparison: 12-HSA vs. Hydrogenated Castor Oil (HCO)
Grease formulators can employ either pre-split 12-HSA or triglyceride Hydrogenated Castor Oil (HCO):
- Direct 12-HSA Reaction: Yields pure lithium soap without generating glycerin. Produces enhanced dropping points (190°C–205°C for simple lithium; 260°C–290°C+ for complex lithium), lower worker volatility, and tighter penetration control after 100,000 worked strokes (ΔPen < 15–20 units).
- In-Situ HCO Hydrolysis: Reacting triglyceride HCO cleaves ester bonds and releases approximately 10% free glycerol into the base oil. Unless fully volatilized at temperatures above 200°C, residual glycerin can soften soap structure and increase high-temperature oil separation.
3. Complex Grease Technology with Sebacic Acid
To formulate high-temperature lithium complex greases capable of continuous service at 150°C–180°C, formulators co-react 12-HSA with a dicarboxylic acid co-thickener—most notably Sebacic Acid (CAS #111-20-6) or azelaic acid. The resulting cross-linked complex lithium structure elevates ASTM D2265 dropping points beyond 280°C, providing robust resistance to thermal softening in heavy automotive wheel bearings and industrial kiln rollers.
4. Particle Size & Handling: Flakes vs. Micronized Powder
At Nagdev Products, 12-HSA is currently under development with target specifications designed for both uniform, free-flowing white flakes and fine powder. Flakes offer excellent bulk shipping durability without cake formation during maritime transit across the tropics, while powder accelerates dissolution and reaction kinetics in cold-kettle alkaline reaction systems.
Key Technical Specifications for Application Formulation
Parameters tested at our plant in Deodar, Gujarat, with analytical results reported on each lot Certificate of Analysis. Every consignment ships with a Certificate of Analysis (COA).
| Analytical Parameter | Typical Unit | Standard Formulation Limit |
|---|---|---|
| Acid Value | mg KOH/g | 175.0 – 182.0 |
| Saponification Value | mg KOH/g | 180.0 – 190.0 |
| Iodine Value | g I₂/100g | ≤ 3.00 |
| Hydroxyl Value | mg KOH/g | 155.0 – 165.0 |
| Melting Point | °C | 75.0 – 78.0°C |
| Colour (Lovibond 1" Cell) | Y+R | ≤ 5.0 Y + 1.0 R |
| Free Fatty Acid (as Oleic) | % | 88.0 – 92.0 |
Recommended Nagdev Products for this Application
Refined monocarboxylic fatty acid (CAS #106-14-9, HS 2918.19) for lithium simple and complex greases.
Hard microcrystalline wax (CAS #8001-78-3, HS 1516.20) with MP 85–88°C for alkaline reaction and rheology.
C10 dicarboxylic complexing co-thickener (CAS #111-20-6, HS 2917.13) for high-temperature complex greases.
Frequently Asked Technical Questions
What is the recommended 12-HSA dosage in NLGI Grade 2 lithium grease? +
Typical 12-HSA thickener content ranges between 6% and 10% by weight depending on base oil viscosity (ISO VG 100 to 460) and whether the formulation is a simple lithium or complex grease.
What is the HS code for 12-HSA export consignments? +
12-Hydroxystearic Acid is classified under HS 2918.19 (indicative classification; final HS code confirmed at the time of export).
How is 12-HSA packaged to prevent caking in transit? +
Packed in 25 kg multi-wall paper bags with an inner moisture-barrier PE liner, palletized with protective stretch-wrap, or in 500 kg / 1,000 kg PP jumbo bulk bags with bottom discharge spouts.
What is the delivery timeline for commercial 12-HSA orders? +
Our plant in North Gujarat is operational and supplying regular commercial grades, while 12-HSA is under development with technical evaluation samples available. Evaluation samples and lot-traceable COA specifications are available on request.
Is pre-formed Lithium 12-Hydroxystearate soap available under development? +
Pre-reacted Lithium 12-Hydroxystearate soap powder is currently under development (development phase), available on technical enquiry for formulation trials.
Operational Plant · Supplying Commercial Volumes Now
Direct farmer-level sourcing from North Gujarat's castor belt (Banaskantha and Vav-Tharad region) ensures high ricinoleic purity, consistent viscosity, and unbroken supply. Request technical dossiers, laboratory trial samples, and term supply contract pricing.