I Want Soy Wax for a 300 g Double-Wick Candle — Does the Larger Melt Pool Change Which Wax Properties I Should Prioritise?

Yes — a bigger shared pool reorders your priorities

The larger melt pool does change which wax properties matter most, though not which ones exist. In a 200 g single-wick jar, the first question is usually whether the pool reaches the edge before the burn ends; tunnelling is the classic failure. In a 300 g double-wick candle, the edge often comes sooner because each wick serves a smaller share of the surface — but two flames now heat one shared pool. The priorities move to how evenly the wax melts across a wide surface, how deep the middle gets where the two flames overlap, how hot a wider, often shallower glass runs, and how much fragrance oil you are spending per candle. Cosmetic properties also gain weight: a wide top shows every ripple, frost line and wet spot.

Put numbers on it with illustrative geometry (these are not CSI jar dimensions — measure your own). A 7.5 cm internal-diameter jar has a pool area of π × 7.5² ÷ 4 = 44.18 cm². A 10 cm jar has 78.54 cm², which is 77.8% larger. With two wicks, each serves 39.27 cm² — less than the single wick's 44.18 cm². At an approximate 0.88 g of wax per millilitre (a labelled conversion; confirm with a weighed pour), the 200 g fill stands about 5.14 cm deep and the 300 g fill about 4.34 cm. The double-wick candle is wider and shallower: 3.82 g of candle per cm² of surface against 4.53 g. Wider and shallower is exactly the shape in which pool depth and glass heat become the lines to watch.

And the fragrance grams grow with the candle. At 8%, the 300 g candle carries 24 g of oil against 16 g in a 200 g candle. With Sandalwood at its 1 kg rate of ₹5.03/g, the oil alone is ₹120.64 — 40.5% of the candle's wax, oil and wick cost. That makes the wax's fragrance ceiling and the load it needs for a good hot throw a cost question as much as a performance one. The waxes compared here differ on exactly that published line: Chunks up to 13%, CSI 464 up to 10%, per their product pages.

How the priorities shift from 200 g single-wick to 300 g double-wick

The table is the core of this page. It does not say any wax is better at any line — CSI publishes no burn, hardness or melt data for its container waxes beyond what each product page states. It says which lines deserve more weight when you score a wax for a wide, double-wick candle.

The middle rows are the ones a single-wick test never asks. A wax can be faultless in a 200 g jar and still give a 300 g double-wick candle with a deep, hot middle and two lagging edges, because the heat distribution is different. That is why this page tests both waxes in the double-wick format itself, not in a 200 g sample. Testing one wax across 50 g to 500 g candles handles the wider question of whether one wax covers a whole size range; this page goes deep on the double-wick case.

Why two flames change the wax's job

In general candle-making practice, each wick melts a roughly circular pool around itself. In a double-wick candle the two pools grow toward each other and merge in the middle first, while the wax farthest from both wicks — on the line at right angles to the wicks — is the last to melt. The merged middle then receives heat from two flames at once. How a particular wax responds to that is not something any product page tells you: a wax that melts readily may give a full, even pool quickly and a deep middle; a wax that holds its structure longer may leave the far edges hanging. Both outcomes depend on the wax, the wick construction, the spacing and the jar.

The deeper middle matters because the wick's flame size is commonly linked to how much liquid fuel it can draw. A deep, hot pool around a wick can feed a larger flame, more mushrooming and more heat into the glass — and with two flames, a larger flame on one can heat the other. Jar heat follows: a wide, shallow glass has more of its wall close to the hot pool for more of the burn. CSI publishes no numeric flame-height or jar-temperature limit and this page invents none. The acceptance rule is the one used across this series: no worse than your approved control on every safety line, and within your jar supplier's guidance and the recognised candle fire-safety standard you work to (ASTM F2417 is a commonly cited US standard — read it for its own requirements).

Throw is the property that tempts makers to choose a double-wick candle in the first place. A larger pool surface can, in general practice, release more fragrance at the same load — which is why the load decision changes in this format. But a larger pool is only an advantage when it is safe and even. The properties that matter for strong hot throw in 200 g candles covers the throw side; here throw is scored only after the safety lines pass.

The double-wick comparison, candle by candle

Each wax gets six 300 g candles: three on a pair of Eco Candle Wicks Thin C1 and three on a pair of Eco Thick C2. The two wick pairs are there because a double-wick candle almost never gets its wick right first time, and a wax should not lose a comparison because the first wick guess suited the other wax. Thick C2 is only an example of a different construction to bracket against; CSI does not publish wick-size charts and no CSI wick is claimed as a size step from another. In each group of three, two candles are burned (one to the end of its life) and one stays on the shelf. These counts are labelled working practice.

"Control" here means your current approved double-wick candle if you have one. If this is a new product, the first passing combination becomes the control for everything after it — so be strict about which candle earns that title. The objective comparison protocol explains how to blind the throw scoring, and whether repeated wick testing should influence wax choice covers what to do when one wax needs a bracket for every new oil.

Load, oil grams and cost per 300 g candle

Because the double-wick candle carries more oil, the load decision is where the money is. Here is the 300 g candle at three loads, priced at the 5 kg wax rate (Chunks ₹599.00/kg, CSI 464 ₹507.40/kg), Sandalwood at its 1 kg rate (₹5.03/g) and two Eco Thin C1 wicks at ₹5.90 each. The jar is excluded because CSI lists no double-wick jar — add your own jar price. Labour, packaging, freight and GST are excluded too.

Two readings matter. First, the oil dominates: moving the Chunks candle from 8% to 6% saves ₹26.57 per candle, far more than the ₹25.28 that separates Chunks from CSI 464 at the same load. If the larger pool gives you the hot throw you want at 6%, that is worth more than any wax price difference. Second, the ceiling sets your room to move: CSI 464's page rates it up to 10% (30 g of oil in this candle); Chunks' page rates it up to 13% (39 g). If your scoring sheet says the candle needs more than 10%, only one of these two waxes can follow you there. Comparing finished cost at each wax's optimal load is the full method; this table is the double-wick version.

Wick cost also doubles. Two Eco Thin C1 wicks add ₹11.80 per candle; if the bracket shows the candle needs the Thick C2 pair, that becomes ₹18.88, taking the Chunks candle at 8% from ₹297.77 to ₹304.85. For comparison, the same Sandalwood at 8% in a 200 g single-wick Chunks candle costs ₹196.54 in wax, oil and wick. Whether wick cost belongs in a wax comparison explains why the wick bracket result should go into the wax decision.

The priced double-wick test kit

Six 300 g candles per wax need 1,656 g of wax, 1,738.8 g with a 5% pour-loss allowance (a working assumption). Twelve candles share one Sandalwood lot: 288 g, 302.4 g with allowance. Each wick pair group needs 12 wicks plus two spares.

The Chunks line is cheaper as four 500 g bags (₹1,196.00) than as two 1 kg bags (₹1,198.00) because the 500 g bag works out at ₹598.00 a kilo; CSI 464 goes the other way, two 1 kg bags at ₹1,014.80 beating four 500 g bags at ₹1,040.00. Neither wax gets cheaper per kilo above 1 kg: Chunks' 10 kg bag is ₹599.90 a kilo, and CSI 464 is a flat ₹507.40.

The decision rule for a double-wick wax

Then buy. If CSI 464 passes on the Thin C1 pair and the load step settles at 8% or below, one 10 kg bag (₹5,074.00) makes 36 candles of 276 g wax each before allowances. If the candle needs Chunks, buy two 5 kg bags (₹5,990.00) rather than one 10 kg bag (₹5,999.00) — the two 5 kg bags are ₹9.00 cheaper and easier to store. Either way, buy the production oil at the 1 kg size only if your per-gram saving is real for that oil: Sandalwood's 1 kg rate (₹5.03/g) is the same as its 100 g rate. The qualification test is where this result joins the rest of the approval.

Related questions in choosing a soy wax

Container size is one axis of the wax decision; fragrance family, process and climate are others. These siblings take the neighbouring questions.

Frequently asked questions