Soaping in emulsions is one of the most common sensory issues formulators encounter when working with natural emulsifiers such as Montanov 68, Olivem 1000, and older systems like Cetearyl Alcohol + Polysorbate 60. It can make a cream appear white or streaky when rubbed into the skin, even if the formula is perfectly stable.
This guide explains what soaping actually is, the two different mechanisms behind it, and how to reduce or eliminate it through smart formulation choices.
🧴 What Is Soaping?
Soaping refers to the temporary whitening or drag that appears when a cream or lotion is rubbed into the skin. It looks like soap lather, but it isn’t caused by surfactants.
Importantly, “soaping” can arise from two different mechanisms, depending on the emulsifier system.
⭐ The Two Causes of Soaping in Emulsions
1️⃣ Lamellar Whitening (Modern Natural Emulsifiers)
This is the type of soaping seen with Montanov 68, Olivem 1000, and other glucoside‑based natural emulsifiers.
What’s happening
- These emulsifiers form lamellar liquid‑crystal structures.
- When rubbed, the layers temporarily trap air.
- Air pockets scatter light → white streaks.
- The emulsion does not split.
- Whitening disappears once absorbed.
Key point
This type of soaping is sensory, not a stability failure.
2️⃣ Micro‑Phase Separation (Older Emulsifier Systems)
This is the type of soaping seen with older emulsifiers such as:
- Cetearyl Alcohol + Polysorbate 60
- Glyceryl Stearate + PEG‑100 Stearate
- Stearic Acid + TEA
What’s happening
- Under shear (rubbing), the emulsion momentarily destabilises.
- Tiny oil‑water domains form.
- These scatter light → white streaks.
- This is a true micro‑split, though temporary.
Key point
This type of soaping is structural, caused by emulsifier imbalance or excessive waxy components.
⭐ How to Tell Which Type You’re Seeing
| Feature | Lamellar Whitening (Montanov 68) | Micro‑Splitting (Polysorbate 60) |
|---|---|---|
| Cause | Air entrapment in lamellar layers | Temporary phase separation |
| Stability impact | None | Minor, but indicates imbalance |
| Texture | Draggy, cushiony | Waxy, heavy |
| Fix | Add slip agents, reduce fatty alcohols | Adjust emulsifier system, reduce waxes |
⭐ Why Soaping Happens (Both Mechanisms)
✔ High fatty alcohol content
Cetearyl or cetyl alcohol increases lamellar density and drag.
✔ Heavy butters or waxes
Shea, cocoa, or high‑melting waxes exaggerate whitening.
✔ Lack of slip agents
Without esters or lightweight emollients, the formula feels draggy.
✔ Overly thick oil phases
Dense oil phases resist spreading and trap air.
✔ Emulsifier imbalance (older systems)
Polysorbate 60 systems can micro‑split under shear.
⭐ How to Reduce or Eliminate Soaping
1️⃣ Reduce Fatty Alcohols
Lower cetearyl alcohol or cetyl alcohol by 0.5–1%.
Replace part with:
- Caprylic Capric Triglyceride
- Coco‑caprylate/caprate
2️⃣ Add Slip Agents (Most Effective Fix)
Even 1–2% can dramatically reduce whitening.
Best options:
- Isoamyl laurate
- Coco‑caprylate/caprate
- Dicaprylyl carbonate
- Squalane
- CCT (caprylic/capric triglyceride)
These reduce drag and prevent air entrapment.
3️⃣ Improve Oil Phase Mobility
Blend:
- light esters (fast‑spreading)
- medium oils (structure)
- butters (richness)
Avoid overly waxy systems.
4️⃣ Add a Co‑Emulsifier
Helps modify lamellar structure and reduce whitening.
Examples:
- Glyceryl Stearate SE
- Polyglyceryl‑6 Distearate
5️⃣ Adjust Cooling Process
Cool slowly with gentle stirring. Rapid cooling exaggerates lamellar formation.
6️⃣ Increase Oil Phase Slightly
Adding 1–2% more oil can reduce drag.
⭐ Ingredients That Reduce Soaping
| Category | Examples | Benefit |
|---|---|---|
| Light esters | Caprylic Capric Triglycerides | Slip, glide |
| Silicone alternatives | Coco‑caprylate/caprate | Reduced drag |
| Emollients | Squalane, | Spreadability |
| Co‑emulsifiers | Glyceryl Stearate SE | Lamellar modification |
| Humectants | Propanediol, Glycerine | Hydration reduces friction |
⭐ FAQs
Does soaping mean my emulsion is unstable? Not necessarily — lamellar whitening is purely sensory.
Is Montanov 68 more prone to soaping? It can be, if paired with high fatty alcohols — but it’s easily fixed.
Can older emulsifiers soap more? Yes — Polysorbate 60 systems often show micro‑splitting.
Can silicones fix soaping? Yes — even silicone alternatives work well.
⭐ Related Reading
- Montanov 68 Complete Guide
- How to Formulate with Montanov 68
- Montanov 68 Troubleshooting Guide
- Montanov 68 Compatibility Chart
- Montanov 68 vs Olivem 1000
⭐ Where to Buy Montanov 68
You can purchase high‑purity, natural Montanov 68 from The Formulary: