Problem: Solvent

What Is a Solvent in Fragrance?

In fragrance formulation, a solvent is an ingredient that dissolves or carries aromatic materials. Solvents appear across many categories—fine fragrance, candles, diffusers, surfactant systems, and more. While solvents have valid technical uses, they can also be overused to reduce cost at the expense of performance.

The Two Primary Uses of Solvents

1. Technical Performance

Some product bases make it difficult for fragrance to diffuse properly. In these cases, a solvent can improve functional performance by helping the fragrance lift, disperse, or remain stable.

• Candle & diffuser oils: Solvents help fragrance escape from wax or diffusion media and can raise flashpoints to safe levels (typically above 140°F).
• Shower gel & surfactant-heavy bases: Solvents can support clarity, stability, and color retention.
• Alcohol-free systems: Certain solvents help replicate the lift that ethanol naturally provides.

2. Cost Cutting (The Not-So-Great Use)

Solvents are inexpensive. Some manufacturers “cut” fragrance oils by diluting them heavily—sometimes up to 90% solvent— to offer a lower price point. The result: weaker performance, instability, and poor longevity.

Example: If a fragrance oil costs $100/kg, a supplier may dilute it 50% with solvent to bring the price down to $50/kg. The price drops, but so does the amount of actual fragrance.

How Solvent-Heavy Oils Affect Your Product

A low-cost, heavily diluted fragrance may seem appealing at first—but it often creates more problems than it solves.

1. Higher Usage Requirements

You’ll need significantly more fragrance to achieve the same impact—eliminating any savings. High load requirements also increase the risk of solubility and stability issues.

• Separation
• Color shifts
• “Sweating” in candles
• Fragrance floating to the surface in liquids

In professional applications, it is rare to exceed 2% fragrance load for bar soap or most personal care bases.

2. Decreased Performance Over Time

Heavy solvent levels can reduce strength, degrade longevity, and blunt the character of the fragrance. Consumer testing consistently shows that a lower dosage of a concentrated oil outperforms a higher dosage of a diluted one.

How to Check How Much Solvent Is in Your Oil

The easiest way is to review the oil’s SDS (Safety Data Sheet), where hazardous materials are listed by percentage. If you see a solvent listed at high percentages, it’s a red flag.

Example (not ours):

In this case, benzyl benzoate—a common solvent—makes up to 50% of the formula.

Important note: Regardless of your views on solvents, avoid phthalates. These materials are associated with health risks, and we never use them in any formulation.

Documentation and Technical Support

All of our fragrance oils include IFRA limits on each product page. SDS, allergen reports, and detailed documentation are available at any time.

Request documentation: Documentation Request Form

Determine usage levels: Fragrance Oil Calculator

Frequently Asked Questions

In Summary

Solvents play a role in fragrance formulation—but the way they’re used matters. Concentrated fragrance oils provide better performance, greater stability, and more consistent results across applications. When evaluating fragrance oils, always review documentation, usage requirements, and the overall quality of the formulation.

Explore our professionally crafted, highly concentrated fragrance oils: Shop all fragrance oils