What Is the Difference Between Span and Tween

Date:2025-12-29

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Span and Tween emulsifiers are widely used to help evenly mix oil and water in the food, pharmaceutical, and cosmetic industries. They both belong to the non-ionic surfactant family, but exhibit significant differences in practical applications.

This blog discusses the differences between them, covering their structure, solubility, HLB values, applications, why they are often used in combination, and their safety.

1. Basic Definition: Span vs Tween

Span emulsifiers are non-ionic surfactants derived from sorbitol and fatty acids. They are oil-soluble and have low HLB values, which means they prefer the oil phase. This makes Span emulsifiers suitable for formulations where fats play a dominant functional role.

Common examples:

Span 20 (Sorbitan Monolaurate, E493)

Span 60 (Sorbitan Monostearate, E491)

Span 80 (Sorbitan Monooleate, E494)

Tween emulsifiers are polyoxyethylene sorbitan esters. They are non-ionic surfactants produced by ethoxylating sorbitan fatty acid esters. The presence of polyoxyethylene chains increases their hydrophilicity, allowing them to interact efficiently with aqueous systems. They are widely used to support uniform dispersion and formulation consistency.

Tween in dairy product

Common examples:

Tween 20 (Polysorbate 20, E432)

Tween 60 (Polysorbate 60, E435)

Tween 80 (Polysorbate 80, E433)

2. Key Difference in Solubility

One of the clearest differences is solubility:

Span emulsifiers dissolve better in oils and fats

Tween emulsifiers dissolve easily in water

Because of this, Span emulsifiers are often used to stabilize water-in-oil (W/O) systems, while Tween emulsifiers are mainly used in oil-in-water (O/W) systems.

3. HLB Value (Most Important Difference)

HLB (Hydrophilic–Lipophilic Balance) determines how an emulsifier behaves.

Emulsifier	Typical HLB	Behavior
Span 20	~8.6	More oil-loving
Span 60	~4.7	Strongly lipophilic
Tween 20	~16.7	Strongly water-loving
Tween 80	~15.0	Water-soluble emulsifier

Low HLB → Span → W/O emulsions
High HLB → Tween → O/W emulsions

In practical formulations, this HLB difference directly affects emulsification behavior. Span emulsifiers mainly stabilize fat-rich systems by improving oil structure and acting as co-emulsifiers, while Tween emulsifiers help disperse oils into water, forming fine and stable emulsions in liquid systems.

4. Typical Applications

Food Industry

Span

Margarine
Shortening
Bakery fats

Tween

Beverages
Dairy and non-dairy creams
Flavor emulsions

Pharmaceuticals & Cosmetics

Span: Ointments, W/O creams
Tween: Syrups, injections, lotions, shampoos

5. Why Span and Tween Are Often Used Together

Using Span or Tween alone does not always provide enough stability. When combined, they offer better control of emulsification.

Benefits of combining Span and Tween:

Adjustable HLB for different formulations
Improved emulsion stability
Smaller and more uniform oil droplets
Better performance under heat and shear

This combination is common in beverages, sauces, creams, and functional food emulsions.

6. Regulatory and Safety Considerations

Both Span and Tween emulsifiers are:

Non-ionic and mild

Widely approved for food use

Listed with E-numbers in many regions

They are generally considered safe when used within regulatory limits.

Conclusion

The primary differences between Span and Tween emulsifiers are their solubility, HLB values, and functional role. Span emulsifiers are oil-soluble with low HLB values, while Tween emulsifiers are water-soluble with high HLB values. Many food formulators combine the two to achieve stable, balanced emulsions, thereby improving product texture, consistency, and shelf life.

For manufacturers and distributors seeking high-quality emulsifiers such as Span and Tween, Chemsino offers a comprehensive range of food-grade solutions. Please feel free to contact us for more information and free samples.

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