Buyer FAQ
What Fragrance Concentration Should I Choose for My Product?
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What Fragrance Concentration Should I Choose for My Product?
Fragrance load percentage directly affects scent throw, product longevity, cost, and safety compliance. Choose wrong and you either waste money on excess oil or ship a product that customers call “weak.” Here are the specific numbers for each product category.
Standard Concentration Ranges by Product Type
| Product | Typical Fragrance Load | Sweet Spot |
|---|---|---|
| Reed diffuser (100-200 ml) | 20-30% | 25% |
| Scented candle (soy or paraffin) | 6-10% | 8% |
| Room spray (100-250 ml) | 10-20% | 15% |
| Car diffuser (5-10 ml) | 30-50% | 40% |
| Wax melts | 8-12% | 10% |
| Electric diffuser oil | 15-25% | 20% |
These percentages refer to fragrance oil as a proportion of the total liquid or wax weight. The remainder is carrier: DPG or isopropyl myristate for diffusers, wax for candles, and water plus solubilizer for sprays.
Why Reed Diffusers Sit at 20-30%
Reed diffusers rely on passive evaporation through reed sticks. The fragrance must be concentrated enough to project scent into a 15 to 25 square meter room, yet diluted enough to wick properly through the reeds. Below 20%, the scent is barely noticeable beyond 1 meter. Above 30%, the oil becomes too viscous for consistent capillary action, and reeds clog faster.
At Aromiso, our standard reed diffuser formula uses 25% fragrance oil in a DPG base. This delivers 8 to 12 weeks of consistent throw from a 150 ml bottle. Clients targeting the luxury segment sometimes request 30%, which intensifies the first 2 weeks of throw but shortens overall life to 6 to 8 weeks.
How Concentration Affects Your Unit Cost
Fragrance oil is the most expensive raw material in any scented product. At current pricing:
- Standard fragrance oils cost $12 to $25 per kg
- Premium or niche-accord oils cost $30 to $60 per kg
- Natural essential oil blends cost $40 to $120+ per kg
For a 150 ml reed diffuser at 25% concentration, you use roughly 37 ml (about 35 g) of fragrance oil. At $20/kg oil, that is $0.70 in fragrance cost per unit. Bump to 30% and the cost rises to $0.84. Across 5,000 units, that is a $700 difference.
For candles, an 8% load in a 200 g candle means 16 g of oil, roughly $0.32 per unit at $20/kg. Going to 10% adds $0.08 per unit.
Matching Concentration to Market Positioning
Value segment (retail $8-$15): Use 20% in diffusers, 6% in candles. Keep fragrance cost under $0.50 per unit. Choose simpler accord oils at $12-$18/kg.
Mid-market (retail $15-$35): Use 25% in diffusers, 8% in candles. Fragrance cost of $0.60-$1.00 per unit. This is where most private label brands compete.
Premium and luxury (retail $35-$80+): Use 28-30% in diffusers, 9-10% in candles. Fragrance cost of $1.20-$3.00+ per unit. Complex multi-note accords or high natural content.
Safety and Compliance Limits
You cannot simply maximize fragrance load. Two constraints apply:
IFRA standards. The International Fragrance Association sets maximum usage levels for individual raw materials. Your factory should provide IFRA certificates for every blend. Category 10A (air care) governs reed diffusers; Category 12 covers candles.
Flash point. Reed diffuser liquids with high oil concentration may have a flash point below 60 degrees Celsius, triggering hazardous goods classification for shipping. At 25% in DPG, most blends stay above 65 degrees Celsius and ship as non-dangerous goods. Above 30%, always confirm flash point before booking freight.
CLP and GHS labeling. In the EU, products above certain concentration thresholds require hazard pictograms on packaging. Your factory should supply CLP-compliant label text based on the exact formula.
Practical Advice for Your First Order
- Start at the category sweet spot (25% for diffusers, 8% for candles).
- Request samples at two concentrations, for example 20% and 25%, and blind-test them in a real room for 7 days.
- Do not judge scent strength from the bottle. Evaluate throw at 1 meter and 3 meters over 48 hours.
- Ask your factory for a stability report confirming the blend performs consistently for at least 12 months at the chosen concentration.
- Lock your formula before scaling. Changing concentration after launch alters the product character and may require new safety documentation.
If you share your target retail price and product format, Aromiso can recommend the optimal concentration and provide a cost breakdown within 1 business day.
