Problem: Solvent
Solvents are one of the most misunderstood topics in fragrance creation. We minimize the use of solvents in our formulations, resulting in highly concentrated fragrance oils designed for professional performance. Many clients are surprised to learn that they can often use less of a concentrated oil and achieve better results. Hereâs why.
What Is a Solvent in Fragrance?
In fragrance formulation, a solvent is an ingredient that dissolves or carries aromatic materials. Solvents appear across many categoriesâfine 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 âcutâ fragrance oils by diluting them heavilyâsometimes up to 90% solventâ 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 firstâbut it often creates more problems than it solves.
1. Higher Usage Requirements
Youâll need significantly more fragrance to achieve the same impactâeliminating any savings. High load requirements also increase the risk of solubility and stability issues.
- Separation
- Color shifts
- âSweatingâ 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 oilâs SDS (Safety Data Sheet), where hazardous materials are listed by percentage. If you see a solvent listed at high percentages, itâs a red flag.
Example (not ours):
In this case, benzyl benzoateâa common solventâmakes 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 FormDetermine usage levels:
Fragrance Oil CalculatorFrequently Asked Questions
Are solvents bad?
Not inherently. Many serve important technical functions. The issue arises when solvents are used primarily to dilute oils for cost savings rather than performance.
Do concentrated oils always perform better?
Generally, yesâespecially when formulated intentionally. Concentration supports strength, longevity, and stability.
Can solvent-heavy oils cause issues in candles?
Yes. High solvent levels can cause sweating, poor hot throw, lower flashpoints, or fragrance suppression in wax.
How do I know if an oil contains phthalates?
Phthalates appear in SDS documentation. We never use phthalates in our oils.
In Summary
Solvents play a role in fragrance formulationâbut the way theyâre 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:
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What solvent/diluent do you guys use in your fragrance oils?