Fragrance load is the percentage of fragrance oil measured against wax weight — most container candles are formulated between 6% and 10%, and the real ceiling is set by the wax blend, not by ambition. "Fragrance grades," meanwhile, are supplier marketing shorthand: there is no universal A/B/C scale behind the term. What actually governs what goes into a scented candle is the IFRA category of the fragrance, the wax blend's capacity to hold and burn the oil, and the throw testing behind your specific formula. This guide explains how private label buyers should specify, document and validate both decisions with their candle OEM factory.

Fragrance Load: The First Specification to Fix

Fragrance load (sometimes called fragrance percentage or oil load) is simply the weight of fragrance oil as a share of total wax weight. If a 200-gram container candle is made with 16 grams of fragrance oil, its load is 8%. Industry practice puts most container candle formulas between 6% and 10%; a few specialty wax blends are marketed to carry up to 12%, but every extra point of load raises cost and risk, so it should be a tested decision rather than a default. The load interacts directly with the wax you choose — paraffin, soy, coconut and blends each hold and release fragrance differently, which we cover in our guide to candle wax selection for private label programs.

Overloading is the most common specification mistake. Above the wax's holding capacity the oil can seep out of the wax surface ("wet spots" and sweating), wicks drown or mushroom, the flame soots, and the fragrance itself can scorch instead of diffusing. A higher load is not automatically a stronger candle: throw — how much scent the candle actually delivers — is a system outcome of load, wax, wick and vessel working together. That is why the wick choice in our candle wick and vessel selection guide must always be paired with the final load, never decided before it.

What "Fragrance Grades" Really Mean — and What They Don't

Buyers often arrive asking for "grade A fragrance oil" or "premium grade" scents. There is no recognised international A/B/C grading system for candle fragrance. The terms you will hear from suppliers are marketing labels; the substance behind a safe, legal fragrance is different and documentable. Fragrance compounds are regulated through the IFRA Standards, which set usage limits per ingredient and per product category. Under the current IFRA framework, scented candles fall into the category for products not intended for direct skin contact, with its own allowable concentrations. When a fragrance house issues an IFRA certificate for the correct category, that — not a "grade" label — is the compliance baseline.

The practical takeaway for private label buyers: ask for documents, not adjectives. Before approving a scent, request the IFRA certificate naming the candle category, the safety data sheet (SDS), and the allergen declaration for the specific formula. If a supplier cannot produce these three documents, treat the "premium grade" claim as unverified.

Essential Oils vs Fragrance Oils: A Cost and Performance Trade-off

Essential oils (lavender, eucalyptus, citrus and so on) support natural positioning and carry consumer recognition, but in candles they bring three constraints: they cost significantly more per kilo, some degrade or discolour when blended into hot wax, and strong-scenting formats are hard to achieve with pure essential oils alone. Fragrance oils — blends of aroma materials, some synthetic, some nature-identical — deliver a much wider scent palette, better stability at pouring temperature and more consistent throw, which is why most commercial scented candles rely on them, sometimes blended with essential oils for a "natural" sub-line.

Both routes trigger the same European labelling duty: under the CLP Regulation (EC) No 1272/2008, candles whose fragrance classification meets hazard thresholds must carry hazard pictograms, signal words and, where applicable, allergen declarations on the product label. Your OEM should supply the classification input for each scent so your label artwork is built on real data, not assumptions. The same labelling logic feeds directly into the compliance questions covered in our guide to cosmetic and home-fragrance labelling rules.

Cold Throw and Hot Throw: How the Load Gets Validated

Cold throw is the scent a candle gives off unlit; hot throw is what it releases while burning. Buyers sample one and are surprised by the other, so both must be tested. A proper throw validation burns samples for measured intervals (typically four hours at a time) across the full burn life, in the final vessel and with the production wick, and records scent strength room by room. Fire-safety behaviour is validated alongside: the National Candle Association points buyers to ASTM fire-safety standards such as ASTM F2058 and F2417, which cover candle labelling and fire-safety testing. For the European market, the General Product Safety Regulation (EU) 2023/988 adds a general obligation that candles placed on the EU market are safe under normal use. Burn and safety data from the factory are what make those obligations demonstrable.

How Fragrance Decisions Hit MOQ, Cost and Lead Time

Fragrance is usually the largest raw-material cost in a scented candle, and it drives the commercial terms as much as the sensory result. Fragrance oils are typically blended and supplied in drum quantities (around 25 kg per drum is common), so each scent variant ties up inventory: ten SKUs at one scent each means ten drums, not one. That is why per-SKU MOQs for scented candles are usually shaped by fragrance supply, not wax supply. Load percentage compounds the effect — a 10% load consumes roughly two-thirds more oil than a 6% load across the same order volume. Lead time also stretches: after the formula is approved, scent-specific sampling rounds and throw testing are the steps most often underestimated in launch plans, as we note in our walkthrough of the private label sampling and development process. The market context rewards getting it right: according to Grand View Research, the global candles market is projected to grow from USD 6.01 billion in 2025 to USD 9.30 billion by 2033, a 5.5% CAGR — scent quality is precisely where competing brands differentiate.

The Question Set to Ask Your Candle OEM

• Maximum tested load per wax: what load has been validated for the exact wax blend and vessel I am buying, not a generic wax family?
• IFRA certificate: will it name the correct product category for candles, for each scent, and can I see it before the PO?
• Allergen and SDS package: do I get the full documentation needed for CLP label artwork in my target markets?
• Throw test protocol: how many burn cycles, what room size, what scoring method — and can I join a sample burn review?
• Wick coupling: will the wick be re-tested if I change the load, the vessel or the wax?
• Reformulation policy: if an aroma material is restricted or discontinued mid-programme, who reformulates and who re-tests?

Frequently Asked Questions

Can I just raise the fragrance load to make the scent stronger?

No. Beyond the wax's holding capacity, extra oil seeps out, wicks struggle and sooting increases, and the throw may actually get worse. Strength comes from the load-wick-wax-vessel system validated in testing. If the throw is weak at 8%, the answer is usually a different aroma material or wick, not more oil.

What fragrance load should I choose for soy candles?

Most soy and soy-blend container candles are formulated between 6% and 10%. Soy typically holds less fragrance than paraffin before issues appear, so the validated maximum for your specific blend — sometimes with a small additive — is the number that matters, not the wax family average. Test at your chosen load in your final vessel before approving production.

What documents prove a candle fragrance is compliant?

Three: an IFRA certificate issued for the correct candle product category, the fragrance safety data sheet (SDS), and the allergen declaration for the formula. Together with the factory's burn-test records, these support both CLP labelling in the EU and general product safety obligations.

Specify It, Document It, Test It

Fragrance load and fragrance choice decide whether a private label candle delights customers or generates returns — and whether it clears EU and US compliance without surprises. Besthope Bath manufactures scented candles, bath bombs, body care and gift sets on OEM/ODM and private label terms, with IFRA-documented fragrances, in-house throw and burn testing, and full CLP label support. Contact our team with your target vessel, wax and scent brief, and we will return a load recommendation, MOQ and sampling plan for your first order.