Sucrose Stearate

Overview

Sucrose stearate is a non-ionic emulsifier made by joining sucrose (table sugar) with stearic acid (a fatty acid from plant or animal fat). The result is a waxy off-white solid that creates light, stable oil-in-water emulsions.

It is one of the most natural-positioned emulsifiers available — fully biodegradable, made from common food-grade starting materials, and accepted by all major clean-beauty certifications (Ecocert, COSMOS, NaTrue).

The HLB depends on the specific grade (the ratio of mono- to di-ester) and can range from around 5 (lipophilic, suitable for water-in-oil emulsions) to around 16 (very hydrophilic, suitable for solubilization). The most common grade in DIY supply has an HLB of around 11, suitable for oil-in-water lotions.

The skin feel is exceptional — silky, soft, and almost imperceptible. Sucrose stearate is often used in premium clean-beauty formulations where the formulator wants natural certification and luxury finish in the same product.

Shelf life as a raw material is 2-3 years stored cool and dark.

What it does in a formula

The sucrose head provides hydrophilic anchoring in the water phase; the stearate tail anchors in the oil phase. This stabilizes oil droplets in an emulsion.

The sugar-fat ester structure is also exceptionally gentle — non-ionic, biodegradable, and well-tolerated by sensitive skin.

In a formula it produces a light, fast-absorbing emulsion with a soft, almost powdery dry-down. It is often paired with a small percentage of fatty alcohol or co-emulsifier for thicker creams.

How to use

Add to the oil phase. Heat both phases to 70-80 C (sucrose stearate has a slightly higher melting point than other emulsifiers). Combine and emulsify with a stick blender for 1-2 minutes.

Usage rates by product type:

• Premium face creams: 3-5%
• Light body lotions: 2-4%
• Eye creams: 3-5%
• Hair conditioners (rinse-off): 2-4%
• Cleansing milks: 2-4%
• Sensitive skin lotions: 2-4%

Pair with cetearyl alcohol or cetyl alcohol at 1-3% for thicker creams.

Best for / Worst for

Best for: premium clean-beauty face creams, sensitive skin formulas, natural certification compliance, formulas marketed on “sugar-derived” or “skin-soft” sensory positioning, hair conditioners.

Worst for: thick body butters (use heavier emulsifiers), very oil-heavy formulas above 30% oil phase, beginner formulators (slightly less forgiving than synthetic emulsifiers).

Common pitfalls

Higher melting point. Sucrose stearate melts at 50-60 C and needs to be fully melted in the oil phase before combining. If you see undissolved waxy bits, the temperature is too low.

Sugar caramelization. At very high temperatures (above 90 C) sucrose stearate can start to discolour. Keep heat-and-hold at 70-80 C; do not overheat.

Phase ratio. Like other non-ionic emulsifiers, sucrose stearate needs the right ratio of emulsifier to oil phase. As a guideline, 3-5% emulsifier handles up to 20-25% oil phase. Above 30% oil, increase emulsifier or pair with a co-emulsifier.

Substitutes

• Methyl glucose sesquistearate — close cousin, similar use.
• Polyglyceryl-3 methylglucose distearate — natural, similar role.
• Olivem 1000 — natural emulsifier with different feel.
• Sucragel — sucrose-based cold-process emulsifier, very different format.